2D ferrimagnets provide fertile ground for emergent spin textures, yet the robustness and controllability remain elusive. Here, the topological spin textures and dynamics in the honeycomb ferrimagnet CrWC2S6 are investigated by combining density functional theory with atomistic spin simulations. Bilinear interactions yield only a weak in-plane magnetic anisotropy, whereas the inclusion of biquadratic exchange, extracted via energy mapping, dramatically reorients it into a strong out-of-plane anisotropy. This pronounced change transforms the texture landscape from collective states such as skyrmion lattices and stripe domains to isolated solitons, including skyrmions and domain-wall skyrmions. Thiele's equation accurately reproduces their transport dynamics in excellent agreement with direct Landau-Lifshitz-Gilbert simulations. Specifically, isolated skyrmions exhibit isotropic motion, whereas domain-wall skyrmions display anisotropic dynamics, with certain angles enabling suppression of the Hall velocity. Parameter modifications further indicate possible emergence of domain-wall bimerons, bimeron chains, and purely transverse soliton motion. These results identify biquadratic exchange as a hidden design knob for anisotropy engineering and demonstrate its key role in enabling tunable solitonic topological states in 2D ferrimagnets.

Polycrystalline RCr0.3Ge2 (R = Ho, Er) compounds exhibiting magnetic transitions in the liquid helium temperature region were successfully synthesized, and their magnetic properties and magnetocaloric effects (MCEs) were systematically investigated. Both compounds exhibit antiferromagnetic ordering with N & eacute;el temperature (T-N) of 7.3 and 3.4 K, respectively. Notably, HoCr0.3Ge2 and ErCr0.3Ge2 compounds demonstrate large reversible MCEs characterized by negligible thermal and magnetic hysteresis. Under a magnetic field change of 0-5 T, the maximum magnetic entropy changes [(-Delta S-M)(max)] reach 9.0 and 9.9 J/kg K for HoCr0.3Ge2 and ErCr0.3Ge2 compounds, respectively, accompanied by considerable refrigeration capacities of 118.1 and 111.0 J/kg. The combination of significant MCE performance and excellent reversibility near 4.2 K positions these materials as highly promising candidates for practical cryogenic magnetic refrigeration.

It is of great importance to design magnetocaloric materials with the working temperatures around liquid helium temperature. The magnetic ordering temperature was successfully reduced from 15 K to 3 K with 80% of Ysubstitution in Tm1-xYxGa family. To be specific, Tm0.2Y0.8Ga compound exhibits a ferromagnetic (FM) to antiferromagnetic (AFM) transition and an AFM to paramagnetic (PM) transition at 0.9 K and 3 K, respectively. The maximum of magnetic entropy change (- 0SmaxM ) was calculated to be 10.2 and 12.8 J/kg K under the field changes of 0-5 and 0-7 T respectively. The working temperatures covers the range 0.91 K to 14.07 K and 0.60 K to 15.40 K correspondingly. It indicates that Y-substitution is an effective method to adjust working temperatures of magnetic cooling materials and Tm0.2Y0.8Ga has potential applications in helium liquefaction.

Magnetic refrigeration technology based on the magnetocaloric effect (MCE) shows great potential for application in low-temperature fields such as nitrogen, helium, and hydrogen liquefaction. Rare-earth-based compounds usually display outstanding magnetocaloric performance due to the vacant 4f shell and larger magnetic moments, so they have attracted much attention. The working temperature is one of the core parameters of low-temperature magnetic refrigeration materials, which needs to match specific application scenarios (similar to 4.2 K for liquid helium, similar to 20 K for liquid hydrogen, similar to 77 K for liquid nitrogen). This paper reviews the strategies for regulating the working temperatures of rare-earth-based low-temperature magnetic refrigeration materials and concentrates on low-spin rare-earth substitution, zero-spin rare-earth substitution, amorphous engineering, and non-rare-earth atom substitution methods. It provides references for designing low-temperature magnetic refrigeration materials with desired working temperatures.

Magnetic refrigeration materials are significantly needed in versatile modern industries, including scientific research, aerospace, and health care, due to their potential applications in gas liquefaction and storage. Herein, a significantly enhanced magnetocaloric effect with a suitable operation temperature range of 53-114 K and a giant refrigeration capacity (RC) of 646.3 J kg-1 under a magnetic field change of 0-5 T was achieved in Tb3Co0.8Ni0.2. The antiferromagnetic to paramagnetic (AFM-PM) transition temperature in Tb3Co1 - xNix (0 <= x <= 0.3) and Tb3Co1 - yFey (0 <= y <= 0.15) remains almost unaltered at T N = 82 K, attributable to the unchanged de Gennes factor. However, the ferromagnetic to antiferromagnetic (FM-AFM) transition temperature T t = 72 K in Tb3Co drastically decreases in Ni-doped compounds due to the enhanced AFM coupling via the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction among the Tb atoms and slightly increases with larger Fe atom doping, allowing for a more convenient comparative analysis. Simultaneously, the single peak in the magnetic entropy change (-Delta S M) curves in Tb3Co1 - yFey gradually switches into two peaks due to the separated T t and T N in Tb3Co1 - xNix compounds, further resulting in the significant enhancement with the RC and operation temperature span increased by 41% and 82% compared to those of Tb3Co for the magnetic field change of 0-5 T, respectively. Our work indicates the promising applications of the Tb3Co0.8Ni0.2 compound in the liquefaction of nitrogen and provides a convenient and effective strategy for designing suitable magnetic refrigeration materials via chemical pressure. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic),Tb3Co0.8Ni0.2(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)53 K-114 K, (sic)0-5 T(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)646.3 J kg-1.(sic)(sic)de Gennes(sic)(sic)(sic)(sic)(sic)(sic), Tb3Co1 - xNix(0 <= x <= 0.3)(sic)Tb3Co1 - yFey (0 <= y <= 0.15)(sic)(sic)(sic)(sic)(sic)(sic)(sic)-(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)T N = 82 K.(sic)(sic), Tb3Co(sic)(sic)(sic)(sic)-(sic)(sic)(sic)(sic)(sic)(sic)(sic)(T t = 72 K), (sic)Ni(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)Tb(sic)(sic)(sic)(sic)(sic)Ruderman-Kittel-Kasuya-Yosida (RKKY)(sic)(sic)(sic)(sic)(sic)(sic)(sic)AFM(sic)(sic), T t(sic)(sic)(sic)(sic), (sic)(sic)(sic)Fe(sic)(sic)(sic)(sic)(sic)(sic)(sic)T t(sic)(sic)(sic)(sic).(sic)(sic), (sic)(sic)Tb3Co1-xNix(sic)(sic)(sic)(sic)T t(sic)T N(sic)(sic)(sic)(sic)(sic), Tb3Co1 - yFey(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)0-5 T(sic)(sic)(sic)(sic)(sic), Tb3Co0.8Ni0.2(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)Tb3Co(sic)(sic)(sic)41%(sic)82%.(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), Tb3Co0.8Ni0.2(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic) (sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).

Rare-earth soft magnetic alloys exhibit strong potential for high-frequency applications owing to their pronounced easy-plane anisotropy. In this study, magneto-crystalline and crystallographic orientations are modulated to optimise the microwave absorption performance of Sm2Fe14B powder/paraffin composites through grain morphology regulation. Following hot-deformed (HD) treatment, the grains evolve from small equiaxed structures to larger equiaxed and platelet morphologies. The HD sample treated at 880 degrees C undergoes intergranular fracture and breaks into flake-like and honeycomb-shaped particles exhibiting the consistently crystallographic and magnetocrystalline orientations. Reduced permittivity (12.48-10.56) and enhanced permeability (1.44-1.09) are achieved in this HD powder/ paraffin composite, resulting in a minimum reflection loss of-19.63 dB. Overall, this study offers a new route for improving microwave absorption performance through the tailored control of grain morphology.

Bulk and ribbon Er2Tm2Al4CuNiGa high-entropy-alloy (HEA) were successfully synthesized by arc-melting method and amorphous engineering, respectively. X-ray diffraction experiment (XRD), differential scanning calorimetry (DSC) traces and high resolution transmission electron microscope (HRTEM) indicate that bulk sample crystalizes in form of polycrystalline while ribbon sample is amorphous. By amorphous engineering, the magnetic transition temperature was reduced below liquid helium temperature and low-field magnetocaloric effect (MCE) was greatly enhanced. The magnetic ordering temperatures were determined as 4.5 K and similar to 3.0 K for bulk and ribbon samples, respectively. The maximum value of magnetic entropy change increases from 2.7/6.7 J/kgK for bulk sample to 4.3/9.0 J/kgK for typical ribbon sample R52 under field changes of 0-1/0-2 T. Furthermore, ribbon samples show the characteristic of second order magnetic transition based on Arrott plots, indicating of good magnetic and thermal reversibility. The large low-field MCE of ribbon Er2Tm2Al4CuNiGa HEA at liquid helium temperature indicates that amorphous engineering is an effective method to improve the performance of magnetic cooling materials.

Unraveling the effects of chemical heterogeneity and intergranular phases on heavy rare earth (Dy/Tb) diffusion is crucial for developing high-performance, cost-effective grain boundary diffusion (GBD) magnets with high Ce substitution. Herein, a previously unreported selective diffusion behavior governed by chemical heterogeneity is uncovered, along with the demonstration of a blocking effect of the ZrB2 phase on Tb diffusion. Comprehensive experimental and theoretical analysis reveals that Tb preferentially diffuses toward Nd-rich grains rather than LaCe-rich grains, thereby hindering Tb diffusion and weakening the magnetic hardening effect in the LaCe-rich grains. This accounts for the lower coercivity increment in multi-main-phase (MMP) GBD magnets (5.15 kOe) relative to that in single-main-phase (SMP) GBD magnets (5.52 kOe). Despite achieving a higher room-temperature coercivity (12.43 kOe), the MMP GBD magnets exhibit inferior thermal stability due to the weaker demagnetization resistance of LaCe-rich grains. Furthermore, the ZrB2 phase exhibits significantly stronger blocking of Tb diffusion than the REFe2 phase, which results in a non-uniform Tb distribution on the grain surfaces. These novel findings establish fundamental microstructure design principles that facilitate the high-efficiency diffusion of heavy rare earth elements, providing a viable pathway to overcome the coercivity bottleneck in GBD magnets with high Ce contents.

Solid-state refrigeration leveraging the magnetocaloric effect (MCE) presents a sustainable and energy-efficient alternative to traditional gas compression refrigeration technologies. However, the practical utility of most magnetocaloric materials is restricted by their narrow operational temperature window. In this work, a stable magnetocaloric effect across an ultrawide temperature range of 146–320 K was achieved in Hf0.85Ta0.15Fe2 magnet via the hydrostatic pressure manipulation. Furthermore, the underlying mechanism for the extended and stable MCEs under hydrostatic pressure has been revealed by magnetization measurements and first-principles calculations. The material systems characterized by strong spin–lattice coupling exhibit considerable potential for externally manipulated hybrid-field-tuned magnetic properties and magnetocaloric performance, providing a convenient and practical approach for advancing applications in magnetic refrigeration technologies.

Precise manipulation and comprehensive understanding versatile topological spin textures in magnetic materials has emerged as a cutting-edge research field, presenting novel opportunities for establishing robust platform for next-generation spintronic applications. Here, we systematically explore the magnetoelastic anisotropy-mediated magnetic domain transition in rare-earth ferrimagnetic TbCo2-xMnx compounds using Lorentz transmission electron microscopy. The transition from conventional Bloch domain walls to zig-zag domain walls is observed, correlated with temperature-dependent lattice deformation. Micromagnetic simulations elucidate the underlying mechanisms of the domain transformation. Additionally, the stabilization of room-temperature magnetic bubbles is realized, and the field-dependent domain evolution demonstrates the magnetostriction effect. These findings emphasize the critical role of magnetoelastic effects in controlling magnetic domains and provide valuable insights for further advancements in rare-earth magnetic materials.

Magnetic antiskyrmions, the anti-quasiparticles of magnetic skyrmions, possess alternating Bloch- and Néel-type spin spirals, rendering them promising for advanced spintronics-based information storage. To date, antiskyrmions are demonstrated in a few bulk materials featuring anisotropic Dzyaloshinskii-Moriya interactions and a limited number of artificial multilayers. Identifying novel film materials capable of hosting isolated antiskyrmions is critical for memory applications in topological spintronics. Herein, the formation of room-temperature antiskyrmions in single ferrimagnetic CoHo rare-metal alloy films of varying thicknesses, observed using Lorentz transmission electron microscopy is reported. Furthermore, rotating magnetic fields (H) are proposed to facilitate antiskyrmion nucleation and enhance their areal density by an order of magnitude compared to that in the same area under individual vertical H. In addition, experimental and phenomenological analysis confirm that antiskyrmion nucleation can be attributed to spin reorientation involving spontaneous canted magnetism, as evidenced by polarized neutron reflectometry. Micromagnetic simulations further show that the antiskyrmion density significantly depends on the magnitude of the rotating field. These findings expand the family of known antiskyrmion-hosting materials and provide insights into their formation mechanisms, thus serving as a basis for their application in topological spintronics.

The emerging interest in topological magnetism has ignited exciting vitality in the field of spintronics, thereby offering a promising route for breaking Moore's law constraints and establishing an efficient information storage model. Unlike the conventional 2D storage cell based on macroscopic magnetization, magnetic skyrmions—the representative of topological magnetism—are considered candidates for realizing 3D memory, such as “racetrack memory,” facilitating the development of topological spintronics. Since the discovery of skyrmion‐hosting materials, extensive studies on topological magnetic materials are conducted, although challenges have arisen with rapid research progress. Herein, the recent progress in topological spintronics, including material and device design, is reviewed. Beyond bulk magnets, research on topological magnetism is focused on low‐dimensional materials, including magnetic films and 2D magnetic materials, which are promising candidates for magnetic storage devices. Furthermore, the design of new structures, such as in lattice or composition asymmetry engineering, to expand the family of topological magnetic materials is essential. In addition to skyrmions, various topological magnetic structures such as antiskyrmions, merons, and 3D complex structures are detailed. Furthermore, topological magnetism manipulation and related principal devices are discussed. This review provides an opportunity to generate more interest and deepen the discussion of topological magnetism.

Low-temperature magnetocaloric materials are of great importance for potential applications of gas liquefaction such as nitrogen, hydrogen and helium for their low liquidation temperatures (similar to 4 K for helium, similar to 20 K for hydrogen and similar to 77 K for nitrogen respectively), of which the working temperature, the maximal magnetic entropy change ((-Delta S-M)(max)), the maximal adiabatic temperature change ((Delta T-ad)(max)), and the temperature average entropy change (TEC) are the key assessment parameters. Herein, we designed and synthesized Er1-xTmxGa series compounds based on the optimization of the spin quantum number (Spin) with their magnetic ordering temperature successfully adjusted from 31.0 K to 15.0 K, which covers the liquid hydrogen temperature range. Particularly, Er0.8Tm0.2Ga shows outstanding (-Delta S-M)(max), TEC(20), and (Delta T-ad)(max) values of 13.6 J/kg K, 10.1 J/kg K, and 4.3 K under the field change of 0-2 T, respectively, which are increased by 32.0 %, 36.4 %, and 48.2 % compared with the parent ErGa compound. It should be noted that the refrigerant capacity (RC) of Er0.8Tm0.2Ga is not only larger than ErGa but also larger than TmGa. Furthermore, neutron powder diffraction (NPD) was employed on Er0.8Tm0.2Ga to reveal the physical mechanism of its enhanced magnetocaloric effect (MCE). It is found that for Er0.8Tm0.2Ga the more pronounced order-to-disorder transition than the spin reorientation (SR) transition, the characteristic second order phase transition, and the existence of the short-range magnetic ordering above the magnetic ordering temperature should be jointly responsible for its large magnetocaloric effect.

Exploring and comprehending magnetocaloric materials with spin reorientation (SR) phase transition is of vital importance for practical applications of magnetocaloric effect (MCE). Herein, this study presents a systematic study on the magnetic properties, heat transport properties, magnetic structure, and electronic structure of NdNi compound. NdNi is observed to undergo an SR phase transition and a ferromagnetic (FM) to paramagnetic (PM) phase transition successively with increasing temperature. Neutron powder diffraction (NPD) experiment reveals that the SR phase transition involves the rotation of Nd magnetic moment from a‐axis to the direction with a deviation angle θ in ac‐plane upon temperature decreasing, whereas Ni does not contribute to the total magnetic moment. These theoretical investigations based on the first‐principles calculations and the second‐order perturbation theory further confirm that the SR phase transition is closely associated with magnetocrystalline anisotropy energy, which is mainly contributed by Nd atoms. The presence of SR phase transition makes NdNi possess a wide refrigerant temperature span, thus merits it as a magnetic cooling material for applications with various temperature ranges. This work provides profound insights for further exploring and comprehending multiple‐phase‐transition magnetocaloric materials.

The effect of Ge substitution for Ga atoms on the magnetic properties and MCE of the resulting Pr(Ga,Ge) compounds was systematically investigated by the combined magnetic measurements and neutron powder diffraction (NPD) experiments. Two magnetic transitions were identified for PrGa0.9Ge0.1 from ferromagnetic (FM) to FM at Tt = 26 K and from FM to paramagnetic (PM) at TC = 56 K. PrGa0.8Ge0.2 shows similar magnetic transitions with Tt = 55 K and TC = 75 K. Diffraction experiments confirmed that the distance between the nearest neighboring Pr atoms decreases with increasing Ge content, which would lead to an increased TC with Ge substitution. NPD experiments on PrGa0.9Ge0.1 supported the similar FM-to-FM transition as PrGa. Ge substitution exhibits a great influence on MCE regarding higher working temperatures, markedly extended work temperature span and comparable refrigerant capacity, hence, is beneficial for practical applications at liquid nitrogen temperatures.

Materials with large magnetocaloric effect (MCE) at low temperatures under low field changes play an important role in the application of cryogenic magnetic refrigeration and attract extensive research interests of researchers. In this work, four ternary rare-earth-based RCoSn (R=Dy, Ho, Er and Tm) compounds were successfully synthesized and the crystal structure, magnetic properties, magnetic phase transition, and magnetocaloric effects were systematically studied. RCoSn (R=Dy, Ho, Er and Tm) compounds all crystallize in orthorhombic TiNiSitype structure and undergo an antiferromagnetic (AFM) to paramagnetic (PM) transition with Neel temperature of 11.0, 7.9, 4.9 and 3.0 K, respectively. Large cryogenic MCE of RCoSn (R=Dy, Ho, Er and Tm) with the maximum magnetic entropy change ( - Delta Smax M ) of 10.6, 13.7, 17.1, 13.4 J/kg K for field change of 0-5 T was obtained. Furthermore, the value of - Delta SmaxM for ErCoSn and TmCoSn is as high as 11.3 and 10.1 J/kg K for field change of 0-2 T, which is very competitive among low temperature magnetocaloric materials. The characteristic of second order magnetic phase transition indicates RCoSn (R=Dy, Ho, Er and Tm) compounds have good magnetic/thermal reversibility. These results show that RCoSn compounds, especially ErCoSn and TmCoSn, exhibit promising MCE and have great application potential in cryogenic magnetic refrigeration.

Nowadays, magnetic refrigerant technology has drawn much attention for its environmental friendliness. Those magnetic materials possessing giant low-field magnetocaloric effect (MCE) performance are of great importance for practical applications, especially at low temperatures. Herein, we present a detailed study on polycrystalline magnetocaloric compounds HoFe2Si2 and TmFe2Si2. HoFe2Si2 exhibits a transition from antiferromagnetic to paramagnetic phase at 2.2 K, while no long-range magnetic ordering is observed in TmFe2Si2 even temperature down to 2 K. For both compounds, they showed large low-field magnetic entropy change (- Delta SM) with the peak values of 10.6 and 7.9 J kg- 1 K- 1 under field change of 0-2 T for HoFe2Si2 and TmFe2Si2, respectively, which is comparable or even larger than some low-temperature magnetocaloric materials. In addition, the characteristic of second-order magnetic transitions of both compounds were confirmed on basis of Arrott plots and mean-field theory criterion. The low magnetic ordering temperatures, large low-field MCE performance along with the feature of second order phase transition for HoFe2Si2 and TmFe2Si2 indicate that both compounds are promising candidate for magnetic refrigerant materials at liquid helium temperature.

We present herein a systematic study of a polycrystalline magnetocaloric compound ErFe2Si2. It exhibits a transition from the antiferromagnetic to the paramagnetic phase around 3.0 K according to magnetic and heat capacity measurements. Neutron powder diffraction revealed that ErFe2Si2 possesses a superlattice magnetic structure with a propagation vector of (0, 0, 0.5). The superlattice magnetic structure can be modeled by a transverse spin density wave (cosine-modulated) or a spiral type, which cannot be distinguished solely by neutron powder diffraction (NPD) pattern fitting. The stability of different types of magnetic structures was also investigated by first-principles calculations. The ErFe2Si2 compound shows a giant magnetocaloric effect with a maximal negative magnetic entropy change and an adiabatic temperature change of 11.5 J/kg K and 5.7 K, respectively, under the field change of 0-1 T. The large low-field magnetocaloric effect is related to its low critical field of metamagnetic transition and its low quasi-saturation magnetic field. The excellent performance of ErFe2Si2 makes this compound a potential magnetocaloric material for applications at liquid helium temperatures.

Magnetization switching driven by spin-orbit torques (SOTs) in perpendicular single magnets contributes to the development of high-efficiency next-generation spintronic memory and logic. However, the in-plane magnetic fields required for deterministic magnetization switching in single magnets hamper the design of all-electric-control devices. Herein, a simple, efficient, and reliable all-electric-control magnetization switching in a sputtered single L1(0)-FePt film with an artificial lateral gradient is reported. The deterministic magnetization switching exhibits a strong angle dependence and can be effectively tuned through lateral asymmetry. A maximum self-switching ratio of 18% is achieved without magnetic fields. The structural characterization results reveal that this deterministic magnetization self-switching can be primarily attributed to the ordering degree gradient. Furthermore, a programmable Boolean logic device together with a full adder is constructed using the single L1(0)-FePt magnet. The findings of the study highlight an effective route to accomplish electrical spin manipulation in single magnets. This enables the design of purely electrically controlled SOTs-based logic and in-memory computing.

AbstractActive sensing matrices play a pivotal role in various electronic devices, including optical and X‐ray imaging arrays, electronic skins, and artificial tactile arrays, among others. These matrices function through a thin‐film active switching mechanism, allowing for the scanning of rows and columns by external circuitry to read the sensory signals of individual pixels. Recently, indium–gallium‐zinc oxide thin‐film transistors (IGZO TFTs) have emerged as highly promising technology in the realm of flexible electronics. They enable the large‐scale integration of functional circuits on flexible substrates. Shift registers are commonly employed as peripheral scanning circuits to sequentially address active‐matrix arrays. To enhance system compactness and minimize external electrical connections, it is imperative to seamlessly integrate shift registers within the active matrices. However, contemporary flexible IGZO‐based shift registers suffer from high operating voltages and low frequencies, which constrain their applicability in high‐performance flexible sensors and displays. In response to this challenge, a breakthrough is presented in the form of low‐voltage, high‐frequency bootstrap shift registers implemented with flexible IGZO technology. The approach involves utilizing SU‐8 buffered polyimide (PI) polymer foils as substrates. These foils boast an exceptional level of surface smoothness, significantly increasing the yield and performance of electronic components, including vias, IGZO TFTs, and capacitors used in the shift register circuitry. Additionally, HfO2/Al2O3/HfO2 sandwich structures are employed as high‐k dielectric layers to reduce the operational voltage. Thanks to the innovative circuit design and optimized fabrication methods, the 16‐stage shift register can operate at just 1.8 V with a frequency of 15 kHz. This breakthrough promises to have a profound impact on a wide range of applications for driving flexible active‐matrix electronic systems.