Tunnel magnetoresistance detection of skyrmions
Tunnel magnetoresistance detection of skyrmions
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DOI：
10.1016/j.jmmm.2021.168552
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发表时间：
2022-01
影响因子：
2.7
通讯作者：
Hao Chen;William Bouckaert;S. Majetich
中科院分区：
文献类型：
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作者：
Hao Chen;William Bouckaert;S. Majetich
利用微磁模拟研究了Néel Skyrmion核方向和Bloch Skyrmion手性的隧道磁阻检测的不同策略。当Néel Skyrmion穿过由隧道势垒隔开的垂直磁化点时，隧道磁阻随时间变化的峰值或凹陷显示出核心方向。当Bloch Skyrmion在合成的反铁磁体下方运动时，磁化的平面内与轨道的轴线垂直，隧道磁阻随时间的变化表现为先峰值后下降，反之亦然，这取决于手性。并与现有的基于霍尔电阻的检测方法进行了比较。
Micromagnetic simulations are used to investigate different strategies for tunnel magnetoresistance detection of the Néel skyrmion core direction and Bloch skyrmion chirality. When a Néel skyrmion passes beneath a perpendicularly magnetized dot separated by a tunnel barrier, a peak or dip in the tunnel magnetoresistance as a function of time reveals the core direction. When a Bloch skyrmion travels below a synthetic antiferromagnet, magnetized in-plane with an axis perpendicular to that of the track, the tunnel magnetoresistance as a function of time shows a peak followed by a dip, or vice versa, depending on the chirality. The results are compared with existing detection methods based on the Hall resistance.