The influence of off-centered nanocontact on the dynamics of magnetic vortex in a confined structure
The influence of off-centered nanocontact on the dynamics of magnetic vortex in a confined structure
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偏心纳米接触对受限结构中磁涡动力学的影响
DOI：
10.1016/j.jmmm.2017.09.083
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发表时间：
2018
影响因子：
2.7
通讯作者：
Liu Yan
中科院分区：
文献类型：
--
作者：
Li Huanan;Sun Hang;Wang Li;Xu Zibo;Dong Ying;Liu Yan
通过微磁学模拟，研究了在偏心纳米接触几何结构中，由面外自旋极化电流引起的不同坡莫合金纳米盘中磁涡旋的动力学行为.模拟结果表明，磁涡旋的动力学行为对纳米接触位置和纳米盘尺寸敏感。深入分析了纳米接触位置对涡旋芯钉扎行为、临界开关电流密度和开关时间的影响。在这种偏心几何结构中，系统总能量的非圆对称性导致所有纳米盘中的磁涡旋容易被激发。较厚的纳米盘有利于磁涡旋的钉扎，而较薄的纳米盘中的磁涡旋更容易表现出回转。提出了一种控制磁涡旋位置的有效方法，从而提高了磁涡旋作为磁存储器和逻辑器件候选器件的可能性。
We report the dynamical behaviors of magnetic vortices in different Permalloy nanodisks induced by an out-of-plane spin-polarized current in an off-centered nanocontact geometry through micromagnetic simulation. Simulation results show that the dynamical behaviors of magnetic vortex are sensitive to nanocontact position and the dimension of nanodisks. The influences of nanocontact position on the vortex core pinning behavior, the critical switching current density and switching time are analyzed deeply. Non-circular symmetry of system total energy in such off-centered geometry leads to the magnetic vortex easy to be excited in all nanodisks. The thicker nanodisks are beneficial to the magnetic vortex pinning, and the vortex is easier to exhibit gyration in the thinner nanodisks. We put forward an effective method to control the magnetic vortex position, thus improving the possibility of using magnetic vortex as a candidate for magnetic memory and logical devices.