Multi-messenger nanoprobes of hidden magnetism in a strained manganite
NATURE MATERIALS(2020)
摘要
The ground-state properties of correlated electron systems can be extraordinarily sensitive to external stimuli, offering abundant platforms for functional materials. Using the multi-messenger combination of atomic force microscopy, cryogenic scanning near-field optical microscopy, magnetic force microscopy and ultrafast laser excitation, we demonstrate both ‘writing’ and ‘erasing’ of a metastable ferromagnetic metal phase in strained films of La2/3Ca1/3MnO3 (LCMO) with nanometre-resolved finesse. By tracking both optical conductivity and magnetism at the nanoscale, we reveal how strain-coupling underlies the dynamic growth, spontaneous nanotexture and first-order melting transition of this hidden photoinduced metal. Our first-principles calculations reveal that epitaxially engineered Jahn–Teller distortion can stabilize nearly degenerate antiferromagnetic insulator and ferromagnetic metal phases. We propose a Ginzburg–Landau description to rationalize the co-active interplay of strain, lattice distortions and magnetism nano-resolved here in strained LCMO, thus guiding future functional engineering of epitaxial oxides into the regime of phase-programmable materials. A multi-messenger combination of atomic force microscopy, scanning near-field optical microscopy and magnetic force microscopy demonstrates a strain-modulated photoinduced ferromagnetic metallic state in La2/3Ca1/3MnO3.
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关键词
Electronic properties and materials,Ferromagnetism,Magnetic properties and materials,Phase transitions and critical phenomena,Surfaces,interfaces and thin films,Materials Science,general,Optical and Electronic Materials,Biomaterials,Nanotechnology,Condensed Matter Physics
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