Experimental demonstration of skyrmionic magnetic tunnel junction at room temperature
Experimental demonstration of skyrmionic magnetic tunnel junction at room temperature
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室温斯格明子磁隧道结的实验演示
DOI：
10.1016/j.scib.2022.01.016
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发表时间：
2022-04-07
期刊：
影响因子：
18.9
通讯作者：
Zhao, Weisheng
中科院分区：
文献类型：
--
作者：
Li, Sai;Du, Ao;Zhao, Weisheng
手性磁skyrmions是一种拓扑自旋结构，在未来的信息技术中具有前景。在过去的十年中，skyrmions的电成核和运动已经被实验证明，而与半导体工艺兼容的电检测尚未实现，这被认为是在实际应用中使用skyrmions的最关键的差距之一。在这里，我们报告了室温下CoFeB/ mgo基磁性隧道结器件中纳米级skyrmions的直接观察。利用高分辨率磁力显微镜成像和隧道磁电阻测量说明了在界面Dzyaloshinskii-Moriya相互作用、垂直磁各向异性和偶极杂散场共同作用下稳定的skyrmions的电检测。由于其拓扑性质和在电流脉冲激励下可调的粒子密度，该磁隧道结具有稳定的非线性多电平电阻。这些特性为自旋电子学实现高密度存储和神经形态计算提供了重要的前景。(C) 2022中国科学出版社。由爱思唯尔、中国科学出版社联合出版。
Chiral magnetic skyrmions are topological swirling spin textures that hold promise for future information technology. The electrical nucleation and motion of skyrmions have been experimentally demonstrated in the last decade, while electrical detection compatible with semiconductor processes has not been achieved, and this is considered one of the most crucial gaps regarding the use of skyrmions in real applications. Here, we report the direct observation of nanoscale skyrmions in CoFeB/MgO-based magnetic tunnel junction devices at room temperature. High-resolution magnetic force microscopy imaging and tunneling magnetoresistance measurements are used to illustrate the electrical detection of skyrmions, which are stabilized under the cooperation of interfacial Dzyaloshinskii-Moriya interaction, perpendicular magnetic anisotropy, and dipolar stray field. This skyrmionic magnetic tunnel junction shows a stable nonlinear multilevel resistance thanks to its topological nature and tunable density of skyrmions under current pulse excitation. These features provide important perspectives for spintronics to realize high-density memory and neuromorphic computing. (C) 2022 Science China Press. Published by Elsevier B.V. and Science China Press.