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- W3037330067 abstract "Abstract Due to its inherent superior perpendicular magnetocrystalline anisotropy, the FePt in L 1 0 phase enables magnetic storage and memory devices with ultrahigh capacity. However, reversing the FePt magnetic state, and therefore encoding information, has proven to be extremely difficult. Here, it is demonstrated that an electric current can exert a large spin torque on an L 1 0 FePt magnet, ultimately leading to reversible magnetization switching. The spin torque monotonically increases with increasing FePt thickness, exhibiting a bulk characteristic. Meanwhile, the spin torque effective fields and switching efficiency increase as the FePt approaches higher chemical ordering with stronger spin–orbit coupling. The symmetry breaking that generates spin torque within L 1 0 FePt is shown to arise from an inherent structural gradient along the film normal direction. By artificially reversing the structural gradient, an opposite spin torque effect in L 1 0 FePt is demonstrated. At last, the role of the disorder gradient in generating a substantial torque in a single ferromagnet is supported by theoretical calculations. These results will push forward the frontier of material systems for generating spin torques and will have a transformative impact on magnetic storage and spin memory devices with simple architecture, ultrahigh density, and readily application." @default.
- W3037330067 created "2020-07-02" @default.
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- W3037330067 date "2020-06-28" @default.
- W3037330067 modified "2023-10-15" @default.
- W3037330067 title "Bulk Spin Torque‐Driven Perpendicular Magnetization Switching in <i>L</i>1<sub>0</sub> FePt Single Layer" @default.
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- W3037330067 doi "https://doi.org/10.1002/adma.202002607" @default.
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