Elyasi Mehrdad, Bhatia Charanjit S, Yang Hyunsoo
Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore.
Sci Rep. 2015 Jan 20;5:7908. doi: 10.1038/srep07908.
The large arrays of magnetic dots are the building blocks of magnonic crystals and the emerging bit patterned media for future recording technology. In order to fully utilize the functionalities of high density magnetic nanodots, a method for the selective reversal of a single nanodot in a matrix of dots is desired. We have proposed a method for magnetization reversal of a single nanodot with microwave excitation in a matrix of magneto-statically interacting dots. The method is based on the excitation of collective modes and the spatial anomaly in the microwave power absorption. We perform numerical simulations to demonstrate the possibility of switching a single dot from any initial state of a 3 by 3 matrix of dots, and develop a theoretical model for the phenomena. We discuss the applicability of the proposed method for introducing defect modes in magnonic crystals as well as for future magnetic recording.
大量的磁点阵列是磁振子晶体和未来记录技术中新兴的位图案介质的构建单元。为了充分利用高密度磁性纳米点的功能，需要一种在点矩阵中选择性反转单个纳米点的方法。我们提出了一种在静磁相互作用点矩阵中通过微波激发使单个纳米点磁化反转的方法。该方法基于集体模式的激发以及微波功率吸收中的空间异常。我们进行数值模拟以证明将3×3点矩阵中任何初始状态的单个点进行切换的可能性，并为该现象建立理论模型。我们讨论了所提出的方法在磁振子晶体中引入缺陷模式以及未来磁记录方面的适用性。
