海歸學者發起的公益學術平臺
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交流學術, 偶爾風月
近來, 依賴電壓而無需電流驅動的180°磁化切換, 為基於自旋電子學實現功耗最小和尺寸更小的器件設計變革提供了可能性。
Voltage-drivencharge-mediated fast 180 degree magnetization switching in nanoheterostructureat room temperature
(室溫下納米異質結構的快速180度磁化切換:電壓驅動、電荷介導)
Min Yi, Hongbin Zhang & Bai-Xiang Xu
Voltage-driven180° magnetization switching without electric current provides the possibility for revolutionizing the spintronics. We demonstrated the voltage-drivencharge-mediated 180° magnetization switching at room temperature by combining first-principles calculations and temperature-dependent magnetization dynamics simulation. The electric field (E)-induced interface charge is found to allow a giant modulation of the magnetic anisotropy (K) of the nanomagnet. ParticularlyKis revealed to vary linearly with respect toEand the epitaxial strain. Magnetization dynamics simulations using the so-obtainedKshow that both in-plane and perpendicular 180° switching can be achieved byEpulses. The temperature effect renders the 180° switching as probability events. Statistical analysis indicates a fast (around 4ns) and low-error-probability 180° switching achievable at room temperature by controlling the magnitude ofEand the pulse width. The study inspires the rational design of miniaturized nanoscale spintronic devices where thermal fluctuation has a great impact.