通过自旋轨道矩利用啁啾电流脉冲实现纳米器件的无外场超快磁化翻转
Field-free ultrafast magnetization reversal of a nanodevice by a chirped current pulse via spin-orbit torque
AI总结：
本文提出利用啁啾电流脉冲通过自旋轨道矩实现垂直磁化纳米器件的无外场超快翻转，显著降低所需电流密度，并适用于铁磁、合成反铁磁和亚铁磁自由层，为超快SOT-MRAM提供新方案。
摘要：
我们研究了利用啁啾电流脉冲（CCP）通过自旋轨道矩（SOT）对垂直磁化纳米器件的磁化翻转。我们的研究结果表明，CCP中SOT的类场（FL）和类阻尼（DL）分量均能在没有任何对称性破缺手段的情况下有效诱导超快磁化翻转。在CCP的宽频率范围内，所获得的最小电流密度与传统SOT翻转所需的电流密度相比显著更小。这种超快翻转源于CCP在磁化越过能量势垒之前（之后）触发磁化从SOT的FL和DL分量增强吸收（发射）能量。我们还验证了CCP驱动的磁化翻转在室温下的鲁棒性。此外，该策略可扩展用于切换垂直合成反铁磁（SAF）和亚铁磁（SFi）纳米器件的磁态。因此，这些研究丰富了对无外场SOT翻转的基本理解，并为实现具有铁磁、SAF和SFi等各种自由层设计的超快SOT-MRAM器件提供了一种新途径。
英文摘要：
We investigated the magnetization reversal of a perpendicularly magnetized nanodevice using a chirped current pulse (CCP) via spin-orbit torques (SOT). Our findings demonstrate that both the field-like (FL) and damping-like (DL) components of SOT in CCP can efficiently induce ultrafast magnetization reversal without any symmetry-breaking means. For a wide frequency range of the CCP, the minimal current density obtained is significantly smaller compared to the current density of conventional SOT-reversal. This ultrafast reversal is due to the CCP triggering enhanced energy absorption (emission) of the magnetization from (to) the FL- and DL-components of SOT before (after) crossing over the energy barrier. We also verified the robustness of the CCP-driven magnetization reversal at room temperature. Moreover, this strategy can be extended to switch the magnetic states of perpendicular synthetic antiferromagnetic (SAF) and ferrimagnetic (SFi) nanodevices. Therefore, these studies enrich the basic understanding of field-free SOT-reversal and provide a novel way to realize ultrafast SOT-MRAM devices with various free layer designs: ferromagnetic, SAF, and SFi.
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