Real-Space Observation of Nonvolatile Zero-Field Biskyrmion Lattice Generation in MnNiGa Magnet
Real-Space Observation of Nonvolatile Zero-Field Biskyrmion Lattice Generation in MnNiGa Magnet
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MnNiGa 磁体中非易失性零场 Biskyrmion 晶格生成的实空间观测
DOI：
10.1021/acs.nanolett.7b03792
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发表时间：
2017-11-01
期刊：
影响因子：
10.8
通讯作者：
Shen, Baogen
中科院分区：
文献类型：
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作者：
Peng, Licong;Zhag, Ying;Shen, Baogen
磁skyrmions，特别是那些没有外部磁场的支持，在一个很宽的温度范围内，有希望作为替代自旋电子单元，以克服传统的磁性位的基本尺寸限制。在这项研究中，我们使用原位洛伦兹显微镜直接证明了在零磁场下在16-338 K的宽温度范围内MnNiGa合金中稳健的双克尔米子晶格的产生和可持续性。该过程包括一个简单的场冷却操作从360 K（高于居里温度T-c类似于350 K），其中拓扑结构的转变很容易发生，通过调整在一定的磁场下的短程磁性团簇。冷却到低于T-c时，有利于双yrmion相。一旦它们产生，由于拓扑保护和增加的能垒，即使在去除外部磁场后，健壮的高密度biskyrmions仍然存在。
Magnetic skyrmions, particular those without the support of external magnetic fields over a wide temperature region, are promising as alternative spintronic units to overcome the fundamental size limitation of conventional magnetic bits. In this study, we use in situ Lorentz microscope to directly demonstrate the generation and sustainability of robust biskyrmion lattice at zero magnetic field over a wide temperature range of 16-338 K in MnNiGa alloy. This procedure includes a simple field-cooling manipulation from 360 K (higher than Curie temperature T-c similar to 350 K), where topological transition easily occurs by adapting the short-range magnetic clusters under a certain magnetic field. The biskyrmion phase is favored upon cooling below T-c. Once they are generated, the robust high-density biskyrmions persist even after removing the external magnetic field due to the topological protection and the increased energy barrier.