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arXiv · 1702.03670

Voltage-driven charge-mediated fast 180 degree magnetization switching in nanoheterostructure at room temperature

Min Yi·Hongbin Zhang·Bai-Xiang Xu
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Abstract

Voltage-driven 180$^\circ$ magnetization switching without electric current provides the possibility for revolutionizing the spintronics. We demonstrated the voltage-driven charge-mediated 180$^\circ$ 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. Particularly $K$ is revealed to vary linearly with respect to $E$ and the epitaxial strain. Magnetization dynamics simulations using the so-obtained $K$ show that both in-plane and perpendicular 180$^\circ$ switching can be achieved by $E$ pulses. The temperature effect renders the 180$^\circ$ switching as probability events. Statistical analysis indicates a fast (around 4 ns) and low-error-probability 180$^\circ$ switching achievable at room temperature by controlling the magnitude of $E$ and the pulse width. The study inspires the rational design of miniaturized nanoscale spintronic devices where thermal fluctuation has a great impact.

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Min Yi, Hongbin Zhang, Bai-Xiang Xu. 2017-02-13. Voltage-driven charge-mediated fast 180 degree magnetization switching in nanoheterostructure at room temperature. https://arxiv.org/abs/1702.03670

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