期刊
ADVANCED MATERIALS
卷 33, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004830
关键词
amorphous materials; coherent X-ray scattering; local inversion symmetry breaking; Lorentz microscopy; topological magnetic states; X-ray spectro-microscopy
类别
资金
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division within the NEMM program (MSMAG) [DE-AC02-05-CH11231]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-AC02-05-CH11231]
- DOE Office of Science User Facility [DE-AC02-05-CH11231]
Experimental evidence of 3D chiral spin textures, including helical spins and skyrmions with different chirality and topological charge, has been reported in amorphous Fe-Ge thick films. These results demonstrate that structurally and chemically disordered materials can resemble inversion symmetry broken systems with similar magnetic properties, moments, and states, providing greater flexibility in materials synthesis, voltage, and strain manipulation.
Topological solitary fields, such as magnetic and polar skyrmions, are envisioned to revolutionize microelectronics. These configurations have been stabilized in solid-state materials with a global inversion symmetry breaking, which translates in magnetic materials into a vector spin exchange known as the Dzyaloshinskii-Moriya interaction (DMI), as well as spin chirality selection and isotropic solitons. This work reports experimental evidence of 3D chiral spin textures, such as helical spins and skyrmions with different chirality and topological charge, stabilized in amorphous Fe-Ge thick films. These results demonstrate that structurally and chemically disordered materials with a random DMI can resemble inversion symmetry broken systems with similar magnetic properties, moments, and states. Disordered systems are distinguished from systems with global inversion symmetry breaking by their degenerate spin chirality that allows for forming isotropic and anisotropic topological spin textures at remanence, while offering greater flexibility in materials synthesis, voltage, and strain manipulation.
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