Switching dynamics of doped CoFeB trilayers and a comparison to the quasistatic approximation
Switching dynamics of doped CoFeB trilayers and a comparison to the quasistatic approximation
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DOI：
10.1103/physrevb.87.174416
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发表时间：
2013-05-10
影响因子：
3.7
通讯作者：
Kovacs, Endre
中科院分区：
文献类型：
--
作者：
Forrester, Michael;Kusmartsev, Feodor;Kovacs, Endre
两个相互作用的CoFeB纳米磁体，尺寸小到足以保持单畴结构的磁化反转的开关时间的调查，已经进行。一个准静态近似给出有效的结果和比较以及阻尼动力学解的Landau-Lifshitz-吉尔伯特方程。切换的特性示出在相关的磁滞回线，我们建立一个完整的相图的各种平行，反平行，和剪切状态的磁化纳米磁体，磁各向异性之间的耦合能量，并与施加的磁场的相互作用。相图总结了与磁化反转现象相关的不同类型的磁滞。切换字段和时间的估计和脆弱性的磁相热致磁场变化进行了检查。相的稳定性是内在和外在的磁性之间的一个很好的平衡，我们研究其不稳定的性质。我们的工作确定的结构，具有最强大的磁化状态，因此，设计伦理的基础上的两个磁性元件创建具有出色的磁阻特性的纳米磁性异质结构。
The investigation of the switching times of the magnetization reversal of two interacting CoFeB nanomagnets, with dimensions small enough to maintain a single-domain structure, has been carried out. A quasistatic approximation is shown to give valid results and to compare well to the damped dynamical solutions of the Landau-Lifshitz-Gilbert equations. The characteristics of the switching are shown in the associated hysteresis loops and we build a complete phase diagram of the various parallel, antiparallel, and scissoring states of the magnetization in terms of the coupling energy between the nanomagnets, magnetic anisotropy, and the interaction with an applied magnetic field. The phase diagram summarizes the different kinds of hysteresis associated with the magnetization reversal phenomena. The switching fields and times are estimated and the vulnerabilities of the magnetic phases to thermally induced magnetic field variations are examined. The stability of the phases is a fine balance between intrinsic and extrinsic magnetism and we examine its precarious nature. Our work identifies the structures that have the most robust magnetization states and hence a design ethic for creating nanomagnetic heterostructures with outstanding magnetoresistance properties based upon the two magnetic elements.