Antiferromagnetic Parametric Resonance Driven by Voltage-Controlled Magnetic Anisotropy
Antiferromagnetic Parametric Resonance Driven by Voltage-Controlled Magnetic Anisotropy
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DOI：
10.1103/physrevapplied.17.034004
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发表时间：
2022-02
影响因子：
4.6
通讯作者：
R. Tomasello;R. Verba;V. Lopez-Dominguez;F. Garescì;M. Carpentieri;M. Di Ventra;P. Khalili Amiri;G. Finocchio
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作者：
R. Tomasello;R. Verba;V. Lopez-Dominguez;F. Garescì;M. Carpentieri;M. Di Ventra;P. Khalili Amiri;G. Finocchio
压控磁各向异性 (VCMA) 是一种操纵铁磁态的低能量替代方案，最近也在反铁磁体 (AFM) 中得到考虑。在这里，我们从理论上证明了 VCMA 可用于在具有垂直各向异性的易轴 AFM 中激发线性和参数谐振模式，从而为 Néel 矢量的有效电控制和高频动态检测开辟了道路。我们的工作取得了两个关键成果：(i) VCMA 参数泵浦经历了所谓的耦合效率“交换增强”，因此比微波磁场或自旋轨道扭矩的效率高 1-2 个数量级；(ii) 它还允许零场参数共振，这是具有平面外易轴的 AFM 中其他参数泵浦机制无法实现的。因此，我们证明 VCMA 参数泵浦是垂直易轴 AFM 中 AFM 阶次相干激励和操纵的最有前途的方法。
Voltage controlled magnetic anisotropy (VCMA) is a low-energy alternative to manipulate the ferromagnetic state, which has been recently considered also in antiferromagnets (AFMs). Here, we theoretically demonstrate that VCMA can be used to excite linear and parametric resonant modes in easy-axis AFMs with perpendicular anisotropy, thus opening the way for an efficient electrical control of the Néel vector, and for detection of high-frequency dynamics. Our work leads to two key results: (i) VCMA parametric pumping experiences the so-called “exchange enhancement” of the coupling efficiency and, thus, is 1-2 orders of magnitude more efficient than microwave magnetic fields or spin-orbit-torques, and (ii) it also allows for zero-field parametric resonance, which cannot be achieved by other parametric pumping mechanisms in AFMs with out-of-plane easy axis. Therefore, we demonstrate that the VCMA parametric pumping is the most promising method for coherent excitation and manipulation of AFM order in perpendicular easy-axis AFMs.