Symmetry and the macroscopic dynamics of antiferromagnetic materials in the presence of spin-polarized current
Symmetry and the macroscopic dynamics of antiferromagnetic materials in the presence of spin-polarized current
复制标题
自旋极化电流存在下反铁磁材料的对称性和宏观动力学
DOI：
10.1103/physrevb.85.134446
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发表时间：
2011
影响因子：
3.7
通讯作者：
V. Loktev
中科院分区：
文献类型：
--
作者：
H. Gomonay;R. Kunitsyn;V. Loktev
宏观磁化强度为零或极小的反铁磁材料是目前自旋电子器件的组成元素。然而，使用它们作为显示非平凡可控磁动力学的有源元件的可能性仍然是可讨论的。在本文中，我们扩展了理论[A.F.Andreev，V.I.Marchenko，Sov. Phys. - Uspekhi，23（1980），21]的宏观动力学AFM的情况下，典型的自旋阀设备。特别地，我们考虑了在自旋极化电流存在下具有强交换耦合的原子力显微镜的类固体磁动力学，并给出了不同类型原子力显微镜的电流诱导瑞利耗散函数的旋转矢量表达式。基于线性化运动方程的分析，我们预测了电流诱导的重取向和AFM共振，并找到了临界电流的值的AFMR频率和阻尼常数。我们证明了在AF层中电流感生自旋二极管效应和二次谐波产生的可能性。所提出的方法是广义的电流相关的现象在非均匀原子力显微镜的描述。
Antiferromagnetic (AFM) materials with zero or vanishingly small macroscopic magnetization are nowadays the constituent elements of spintronic devices. However, possibility to use them as active elements that show nontrivial controllable magnetic dynamics is still discussible. In the present paper we extend the theory [A.F.Andreev, V.I.Marchenko, Sov. Phys. --- Uspekhi, 23 (1980), 21] of macroscopic dynamics in AFMs for the cases typical for spin-valve devices. In particular, we consider the solid-like magnetic dynamics of AFMs with strong exchange coupling in the presence of spin-polarized current and give an expression for the current-induced Rayleigh dissipation function in terms of the rotation vector for different types %generalized potential of AFMs. Basing on the analysis of linearized equations of motion we predict the current-induced reorientation and AFM resonance, and found the values of critical currents in terms of AFMR frequencies and damping constants. We show the possibility of current-induced spin-diode effect and second-harmonic generation in AF layer. The proposed approach is generalized for the description of current-related phenomena in inhomogeneous AFMs.