Quantum communication and information processing strongly benefit from the coupling between different quasi-particles, offering complementary advantages. Magnetoelastic materials inherently allow for direct coupling between magnetization dynamics and quantized lattice vibrations, called phonons. Near the ferromagnetic resonances, phonons may thus trade energy and angular momentum with uniformly precessing magnetization, called magnons, and enable transduction of information from magnetic to phononic modes, thereby paving the way for long-range transport of magnetic information without the need of magnetic material. Here, we employ tailored magnetic-nonmagnetic heterostructures, which simultaneously act as cavities for standing shear waves, to bring selective phonons and magnons into resonance. These Co films with Pt seed layers show extended linewidth and reduced amplitude of the phonon-resonant FMR lines, providing a hallmark of energy and angular momentum exchange. Complementarily, by theoretical modeling and ultra-fast coherent phonon spectroscopy, we identify the responsible transverse acoustic phonons as standing shear waves in the combined Co and Pt structure. We find a high crystal quality in conjunction with a large magnetoelastic coupling constant as a prerequisite for efficient magnon-phonon coupling of this type. Such resonant enhancement of magnon-phonon coupling in CMOS-compatible material provides an ideal material platform for future quantum transducers.

We investigated the impact of the Pt seed thickness on the magnetic properties of Co/Pt multilayers (MLs) when using a Ta adhesion layer on an amorphous $\text{SiO}_{2}$ substrate. Increasing the Pt seed thickness results in a surprisingly small change in the perpendicular magnetic anisotropy (PMA). Although the crystal quality of the ML improves considerably, the roughness of the seed rises as well. Comparing both effects, we find that the higher roughness dominates over the better texture, even decreasing the PMA at large thicknesses despite good texture. The effect is still small, only showing a considerable decrease at large seed thicknesses. We attribute this high robustness of the PMA to the use of the Ta adhesion layer, which provides a smoother growth surface and sufficient texture for the ML, compared to depositing the Pt seed on a bare SiO ${ }_{2}$ substrate.

The chiral-induced spin selectivity (CISS) effect is generally attributed to spin-selective transport through chiral molecules, while the role of the molecule-electrode interface remains largely unexplored. Here, we show that adsorption of chiral amino acid derived molecules on ferromagnetic Ni thin films generates a remanent chirality-dependent magneto-optical response that is localized to the molecule-Ni/NiO interface and can be reversibly switched by an external magnetic field, demonstrating its genuine magnetic character. A comprehensive series of control experiments establishes that the response originates from the interfacial region rather than from the molecular layer or the bulk ferromagnet. First-principles calculations reveal that Boc-methionine adsorption proceeds through energetically accessible sulfur- and carboxyl-bound configurations that produce distinct molecular orientations and ligand-p/Ni-d hybridization, thereby defining structurally and electronically distinct interfaces. Together, the experimental and theoretical results support the formation of chiral spinterfaces, identifying the molecule-ferromagnet interface as an active and previously overlooked component of CISS systems. These findings broaden the microscopic picture of CISS beyond the chiral molecule itself and reveals interface electronic structure as a key design parameter for spin-selective molecular devices.

Layers of body-centered cubic (bcc) Fe60V40 are generated in short-range ordered (SRO) Fe60V40 precursors through atomic displacements caused by the irradiation of light noble gas ions. The structural change leads to the onset of ferromagnetism confined to the bcc layers. Here, the variation of ferromagnetic resonance response as a function of Ne+-ions of energies varying from 5 to 30 keV, while keeping the fluence fixed at 7 & times; 1015 ions/cm2 is investigated. The irradiation was performed on SRO Fe60V40 films grown at 300 K as well as at 573 K. Shifts of the resonance line position as a function of ion energy are observed. As the ion energy is increased, the atomic displacements are distributed deeper within the film, thereby increasing the thickness of the induced bcc layers. The results can be understood in terms of a saturation magnetization (Ms) that is fixed for a given growth temperature, and an increasing effective magnetic thickness (teff) with increasing ion-energy. Despite the varying teff, the Land & eacute; g-factor and Gilbert damping tend to remain relatively stable, respectively at 2.099 +/- 0.006 and 0.003 +/- 0.001, thus providing a material system well-suited for microwave applications, that can be reliably modified using ion-irradiation.

Antiferromagnets offer a promising pathway toward robust and ultrafast spintronic devices due to their intrinsically zero net magnetic moment and exchangeenhanced spin dynamics. Here, we demonstrate a spin-orbit torque (SOT)-driven oscillator based on a nanoconstriction patterned from a synthetic antiferromagnet (SAF). Spin rectification measurements reveal SOT-driven excitations of both optical and acoustic modes, along with additional resonances that emerge above a threshold DC current near the spin-flop transition. These resonances originate from self-sustained oscillations whose chirality is determined by the polarity of the driving DC current, and which can injection-lock to the detection frequency. Macrospin and micromagnetic simulations corroborate the existence of these chiral self-oscillations and predict chaotic dynamics near the spin-flop regime, experimentally indicated as the sudden onset of multiple oscillation modes above a DC threshold current.

Chirality-induced spin selectivity (CISS) enables spin-dependent transport at chiral molecule/Au(111) interfaces and is used in spintronics when combined with ferromagnetic thin films in spin-valve-type hybrids. However, the influence of substrate microstructure on CISS and the related magnetization induced by the proximity of adsorbed chiral molecules (MIPAC) effect is still not well understood. In this study, we compare the effects of the adsorption of L-chiral alpha-helical alanine-rich peptides on Au/Co/Au ferromagnetic thin films fabricated by molecular beam epitaxy (MBE) and magnetron sputtering. X-ray reflectivity and X-ray diffraction show sharper interfaces and a narrower Au(111) rocking-curve width for the MBE-grown sample. However, atomic force microscopy and scanning tunneling microscopy images reveal that both sample types have locally smooth Au(111) surface regions suitable for peptide adsorption, despite clear differences in larger-scale morphology. Microscopic scanning tunneling spectroscopy after peptide exposure yields similar magnetization-direction-dependent tunneling currents in both sample types, confirming a similar magnitude CISS effect on the molecular scale. In contrast, macroscopic magneto-optical Kerr effect hysteresis loops and effect microscopy reveals that only sputter-deposited samples show slight coercivity enhancements and a consistent reduction in domain wall velocity after peptide exposure. These results suggest that microscopic CISS signatures are robust for both sample types, whereas macroscopic MIPAC-type magnetic responses are more sensitive to the substrate microstructure.

The magnetic domains of perpendicular magnetic anisotropy (PMA) systems can occur in many different variants and patterns at remanence, from dense isolated bubble states to fully interconnected labyrinth stripe domain states. One particularly interesting state is the highly parallel aligned stripe domain state, because it breaks in-plane rotational symmetry and exhibits unique properties. Usually, an in-plane demagnetization routine is needed to achieve this parallel stripe domain state, however, a tilted (low PMA) magnetization system shows this state already after saturation. Here, we compare the in-plane magnetic anisotropy induced by the parallel stripe alignment in a tilted magnetization versus a high PMA system.

Despite extensive research on chirality-driven spin selectivity, most studies have focused on static magnetic properties, while the influence of chirality on the dynamic magnetic response remains largely unexplored. Here, we investigate how chiral molecular interfaces affect magnetization dynamics in thin Co/Ni multilayers with perpendicular magnetic anisotropy using broadband ferromagnetic resonance spectroscopy. A comparison between bare (reference) films and molecule-functionalized (hybrid) samples reveals no measurable changes in either the resonance field or the linewidth that could be attributed to the presence of the chiral environment. Motivated by our findings we develop a macrospin description that distinguishes equilibrium modifications of the magnetic free-energy landscape (MIPAC-type effects) from non-equilibrium, CISS-induced spin torques. Our analysis shows that equilibrium modifications primarily shift the resonance condition via changes to the free energy landscape and thereby the effective field, whereas damping-like non-equilibrium torques provide a distinct channel for varying the effective damping rate. This approach establishes clear criteria for disentangling chiral-interface-induced energy modifications from torque-driven dynamical effects in ferromagnetic resonance experiments.

Ferromagnetic films with perpendicular magnetic anisotropy (PMA) are key spintronic platforms, enabling high-density magnetic memory, tunable stray fields in heterostructures, and channels for efficient, directional spin-wave propagation. Furthermore, these systems support a variety of magnetic domain configurations, from dense bubble domains to fully interconnected labyrinth or parallel aligned stripe domains. Here, we study two Co/Pt multilayer systems in their respective highly parallel stripe-domain states and report a significant in-plane magnetic anisotropy (≈ 80 kJ/m3 ) arising from rotational-symmetry breaking induced by domain alignment and texture. We find that the stripe-domain–induced anisotropy in our samples is nearly independent of the quality factor, which is used to distinguish between tilted and perpendicular magnetization regimes.

Alanine-rich peptides are of increasing interest in fields of spin chemistry and molecular spintronics due to their potential to exhibit the chiral-induced spin selectivity (CISS) effect. In particular, the 36-mer sequence H-C[AAAAK] 7 -OH has been identified as a promising model for inducing CISS. However, synthesizing this alanine-rich peptide is challenging due to its high hydrophobicity and lysine protection requirements, which typically result in low yields and significant side-product formation. Here, we report an optimized block-wise synthetic strategy employing Fmoc-[AAAAK(Boc)]-OH pentamers and DIC/Oxyma coupling, which significantly improves crude purity. A microwave-supported synthesis on Wang resin, combined with an acetyl capping step and 4-methylpiperidine deprotection, delivered crude peptide with 64% purity, confirmed by analytical reverse phase – high performance chromatography (RP-HPLC) and liquid-phase chromatography – mass spectrometry (LC-MS). By contrast, linear single-amino-acid synthesis and microwave-assisted protocols afforded low-purity or truncated sequences. Our protocol thus provides a robust and scalable route to this peptide, facilitating its application in CISS studies.

Ultrafast magnetization switching is essential for next-generation memory and logic devices operating at terahertz (THz) frequencies. Presently, efficient picosecond spin-orbit torque (SOT) switching relies on heavy metals (HMs), which are costly and environmentally burdensome. Self-generated SOT in nanostructures comprising a single conducting ferromagnetic layer offers a promising, cost-effective alternative, but ultrafast SOT has not been demonstrated in such systems and the underlying torque mechanisms remain unclear. Here we demonstrate SOT-driven picosecond magnetization dynamics in oxide-capped Ni 81 Fe 19 with efficiencies comparable to benchmark Ni 81 Fe 19 /HM heterostructures. By probing spin-charge interconversion on the picosecond timescale, we show that SOT is active only at off-stoichiometric oxide interfaces and negligible at stoichiometric ones, identifying interfacial atomic-scale oxidation of Ni 81 Fe 19 as the key ingredient for SOT efficiency. Moreover, the magnitude and sign of the torques are tunable via the oxidation level and oxide type. These results establish atomic-layer oxidation engineering as a viable, heavy-metal-free route to ultrafast SOT for THz spintronic technologies.

Multilayered synthetic antiferromagnets (SAFs) are artificial three-dimensional (3D) architectures engineered to create novel, complex, and stable spin textures. Noninvasive and quantitative nanoscale magnetic imaging of the two-dimensional stray field profile at the sample surface is essential for understanding the fundamental properties of the spin-structure and being able to tailor them to achieve new functionalities. However, the deterministic detection of spin textures and their quantitative characterization at the nanoscale remain challenging. Here, we use nitrogen-vacancy scanning probe microscopy (NV-SPM) under ambient conditions to perform the first quantitative vector-field magnetometry measurements in the multilayered SAF [(Co/Pt)5/Co/Ru]3/(Co/Pt)6. We investigate the static and dynamic nanoscale properties of antiferromagnetic domains with boundaries hosting "one-dimensional" ferromagnetic stripes with similar to 100 nm of width and periodic modulation of the magnetization. By employing NV-SPM measurements in different imaging modes and involving NV-probes with various crystallographic orientations, we demonstrate distinct fingerprints emerging from GHz-range spin noise and constant stray fields on the order of several mT. This provides quantitative insights into the structure of domains and domain walls, as well as, into magnetic noise associated with thermal spin-waves. Our work opens up new opportunities for quantitative vector-field magnetometry of modern magnetic materials with tailored 3D spin textures and stray field profiles, and potentially novel spin-wave dispersions-in a quantitative and noninvasive manner, with exceptional magnetic sensitivity and nanometer scale spatial resolution.

ABSTRACT Layers of body‐centered cubic ( bcc ) Fe 60 V 40 are generated in short‐range ordered (SRO) Fe 60 V 40 precursors through atomic displacements caused by the irradiation of light noble gas ions. The structural change leads to the onset of ferromagnetism confined to the bcc layers. Here, the variation of ferromagnetic resonance response as a function of Ne + ‐ions of energies varying from 5 to 30 keV, while keeping the fluence fixed at 7 × 10 15 ions/cm 2 is investigated. The irradiation was performed on SRO Fe 60 V 40 films grown at 300 K as well as at 573 K. Shifts of the resonance line position as a function of ion energy are observed. As the ion energy is increased, the atomic displacements are distributed deeper within the film, thereby increasing the thickness of the induced bcc layers. The results can be understood in terms of a saturation magnetization ( M s ) that is fixed for a given growth temperature, and an increasing effective magnetic thickness ( t eff ) with increasing ion‐energy. Despite the varying t eff , the Landé g ‐factor and Gilbert damping tend to remain relatively stable, respectively at 2.099 ± 0.006 and 0.003 ± 0.001, thus providing a material system well‐suited for microwave applications, that can be reliably modified using ion‐irradiation.

This study demonstrates the development of multifunctional printable piezoelectric actuators using PVDF-TrFE and PEDOT:PSS, capable of operating at low voltages and supporting a wide range of applications. By leveraging the high piezoelectric coefficient of PVDF-TrFE and the conductivity of PEDOT:PSS, the actuators exhibit stable performance with precise inkjet printing deposition and optimized waveform parameters. The fabrication process integrates inkjet printing and standard lithography, enabling monolithic integration for high-performance actuation and multifunctional sensing. The PVDF-TrFE-based actuators achieve low-voltage operation (as low as 50 V), efficient energy transfer, and mechanical stability. Enhancing the beta phase of PVDF-TrFE resulted in a deflection of approximate to 600 mu m and vortex generation, crucial for lift in aerial robotic applications. Durability tests confirmed minimal performance degradation after 2,300 actuation cycles. Beyond mechanical deflection, the actuators exhibit sound detection and strain sensing capabilities. Experimental evaluations validated their ability to differentiate sound frequencies, detect muscle strain, and replicate bio-inspired flight dynamics. A preliminary proof of concept for a double-wing structure demonstrated lift generation at low voltages and resonant frequencies. The results indicate that these piezoelectric actuators are well-suited for miniaturized robotic applications, particularly in aerial locomotion and multifunctional sensing, opening new possibilities for innovations in micro-robotics, wearables, and aerial robotics.

The transition from planar to three-dimensional (3D) magnetic nanostructures represents a significant advancement in both fundamental research and practical applications, offering vast potential for next-generation technologies like ultrahigh-density storage, memory, logic, and neuromorphic computing. Despite being a relatively new field, the emergence of 3D nanomagnetism presents numerous opportunities for innovation, prompting the creation of a comprehensive roadmap by leading international researchers. This roadmap aims to facilitate collaboration and interdisciplinary dialogue to address challenges in materials science, physics, engineering, and computing. The roadmap comprises eighteen sections, roughly divided into three blocks. The first block explores the fundamentals of 3D nanomagnetism, focusing on recent trends in fabrication techniques and imaging methods crucial for understanding complex spin textures, curved surfaces, and small-scale interactions. Techniques such as two-photon lithography and focused electron beam-induced deposition enable the creation of intricate 3D architectures, while advanced imaging methods like electron holography and synchrotron x-ray tomography provide nanoscale spatial resolution for studying magnetization dynamics in three dimensions. Various 3D magnetic systems, including coupled multilayer systems, artificial spin-ice, magneto-plasmonic systems, topological spin textures, and molecular magnets are discussed. The second block introduces analytical and numerical methods for investigating 3D nanomagnetic structures and curvilinear systems, highlighting geometrically curved architectures, interconnected nanowire systems, and other complex geometries. Finite element methods are emphasized for capturing complex geometries, along with direct frequency domain solutions for addressing magnonic problems. The final block focuses on 3D magnonic crystals and networks, exploring their fundamental properties and potential applications in magnonic circuits, memory, and spintronics. Computational approaches using 3D nanomagnetic systems and complex topological textures in 3D spintronics are highlighted for their potential to enable faster and more energy-efficient computing.

We demonstrate tunable ferrimagnetic properties in both bulk and thin film ferrimagnetic DyCo3 compatible with the hosting of topological magnetic chiral textures, namely skyrmions suitable for integration into spintronic applications with classic, neuromorphic and quantum functionalities. The bulk samples were prepared by arc-melting of stoichiometric mixtures under purified argon atmosphere and the thin films by Ultra-High-Vacuum magnetron sputtering from a stoichiometric target. Magnetometry allows us to extract the main magnetic properties of bulk and thin films: the saturation magnetization, the magnetic anisotropy and their variation with temperature. These results are successfully complemented by band structure ab initio DFT calculations. Based on the critical magnetic parameters extracted from experiments, we performed micromagnetic simulations that reveal the skyrmionic potential of our samples in both continuous thin film and nano-patterned architectures.

Nanogenerators play a pivotal role in advancing sustainability by enabling wireless sensors to harvest energy from ambient sources. Optimizing their performance is crucial for enhancing energy conversion efficiency and ensuring reliable operation in real-world scenarios. Although calcination temperature has a critical parameter in the synthesis of piezoelectric materials that fundamentally determines their grain size, phase purity, crystalline structure, and, ultimately, their energy conversion efficiency, no studies have yet explored its potential to improve the performance of energy harvesters. This work investigates the influence of calcination temperature on the structural and functional properties of BCZT nanopowder, and its resulting energy conversion performance. Using the sol-gel method, BCZT powders were synthesized at temperatures ranging from 600 degrees C to 1000 degrees C. The results demonstrate that 900 degrees C is the optimal calcination temperature, producing nanopowders with superior structural and functional characteristics. At this temperature, XRD and Rietveld refinement revealed an optimal morphotropic phase boundary with a crystal size of 18.16 nm, while SEM shows uniform particle distribution of around 68.9 nm, significantly smaller than the previously reported particle size achieved by the solgel method, which ranged from 0.8 mu m to 60.5 mu m. Furthermore, Raman spectroscopy confirmed high crystallinity and phase purity. To better analyze the resulting properties in composite form, the different nanopowders were incorporated into the PDMS polymer. The BCZT-900/PDMS nanocomposite exhibits excellent energy harvesting properties, with a 100 % increase in open-circuit voltage (7.8 V) and output power (4.52 mu W) under cyclic loading. The device shows excellent durability over 5000 cycles with a Young's modulus of 2.18 MPa and an elongation at break of 101.32 %. An Ising-like model was also used to simulate the piezoelectric behavior, with the Hamiltonian solved by the Monte Carlo Metropolis method. The simulation results were in agreement with the experimental observations.

Multilayered synthetic antiferromagnets (SAFs) are artificial three-dimensional (3D) architectures engineered to create novel, complex, and stable spin textures. Non-invasive and quantitative nanoscale magnetic imaging of the two-dimensional stray field profile at the sample surface is essential for understanding the fundamental properties of the spin-structure and being able to tailor them to achieve new functionalities. However, the deterministic detection of spin textures and their quantitative characterization on the nanoscale remain challenging. Here, we use nitrogen-vacancy scanning probe microscopy (NV-SPM) under ambient conditions to perform the first quantitative vector-field magnetometry measurements in the multilayered SAF [(Co/Pt)_5/Co/Ru]_3/(Co/Pt)_6. We investigate nanoscale static and dynamic properties of antiferromagnetic domains with boundaries hosting “one-dimensional” ferromagnetic stripes with 100 nm of width and periodic modulation of the magnetization. By employing NV-SPM measurements in different imaging modes and involving NV-probes with various crystallographic orientations, we demonstrated distinct fingerprints emerging from GHz-range spin noise and constant stray fields on the order of several mT. This provides quantitative insights into the structure of domains and domain walls, as well as, into magnetic noise associated with thermal spin-waves. Our work opens up new opportunities for quantitative vector-field magnetometry of modern magnetic materials with tailored 3D spin textures and stray field profiles, and potentially novel spin-wave dispersions–in a quantitative and non-invasive manner, with exceptional magnetic sensitivity and nanometer scale spatial resolution.