Dynamics of magnetoelectric reversal of an antiferromagnetic domain
Dynamics of magnetoelectric reversal of an antiferromagnetic domain
复制标题
反铁磁畴磁电反转的动力学
DOI：
10.1103/physrevapplied.11.034051
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发表时间：
2019
影响因子：
4.6
通讯作者：
Rakheja, Shaloo
中科院分区：
文献类型：
--
作者：
Parthasarathy, Arun;Rakheja, Shaloo
当电场和磁场同时作用在磁电反铁磁体上时，畴态发生反转。虽然初始和最终条件是饱和的单畴状态，反转的过程可以分解成局部多畴切换事件。在薄膜中，从实验中发现的磁电双折射率和开关速度大大低于预期的磁各向异性，类似于布朗悖论的铁磁材料。多畴效应起源于反铁磁畴壁被晶格缺陷亚稳地钉扎，而不是由于静磁能的减少，静磁能可以忽略不计。本文从理论上分析了薄膜磁电反铁磁体中畴反转的形核、畴壁传播和相干旋转。反转机制的时间尺度被建模为所施加的磁电压力的函数。参考最新的实验工作的薄膜磁电开关的理论进行评估：畴壁传播被认为是占主导地位的，并负责在实验中切换。研究结果对利用反铁磁绝缘体的磁电存储器件的能量延迟性能具有重要意义，这对非易失性技术具有很好的应用前景。
When electric and magnetic fields are applied together on a magnetoelectric antiferromagnet, the domain state is subject to reversal. Although the initial and final conditions are saturated single-domain states, the process of reversal may decompose into local multidomain switching events. In thin films of, the magnetoelectric coercivity and the switching speed found from experiments are considerably lower than expected from magnetic anisotropy, similar to Brown’s paradox in ferromagnetic materials. Multidomain effects originate because antiferromagnetic domain walls are metastably pinned by lattice defects, not due to reduction of magnetostatic energy, which is negligible. This paper theoretically analyzes domain reversal in thin-film magnetoelectric antiferromagnets in the form of nucleation, domain-wall propagation, and coherent rotation. The timescales of reversal mechanisms are modeled as a function of applied magnetoelectric pressure. The theory is assessed with reference to the latest experimental works on magnetoelectric switching of thin-film: domain-wall propagation is found to be dominant and responsible for switching in the experiments. The results bear implications for the energy-delay performance of magnetoelectric memory devices utilizing antiferromagnetic insulators, which are prospective for nonvolatile technology.
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DOI：
--
发表时间：
1969
期刊：
影响因子：
--
作者：
Christopher A. Brown
通讯作者：
Christopher A. Brown
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
J. Mallinson
通讯作者：
J. Mallinson
DOI：
--
发表时间：
1961
期刊：
影响因子：
--
作者：
G. Rado
通讯作者：
G. Rado
大成核跳跃噪声动力学的反转时间
影响因子：
2.1
作者：
Parthasarathy, Arun;Rakheja, Shaloo
通讯作者：
Rakheja, Shaloo
影响因子：
4
作者：
Y. Shiratsuchi;Shunsuke Watanabe;Hiroaki Yoshida;Noriaki Kishida;R. Nakatani;Y. Kotani;K. Toyoki;Tetsuya Nakamura
通讯作者：
Y. Shiratsuchi;Shunsuke Watanabe;Hiroaki Yoshida;Noriaki Kishida;R. Nakatani;Y. Kotani;K. Toyoki;Tetsuya Nakamura