Observation of magnetic droplets in magnetic tunnel junctions

Observation of magnetic droplets in magnetic tunnel junctions
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磁隧道结中磁滴的观察

DOI:
10.1007/s11433-021-1794-4
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发表时间:
2020-12
期刊:
SCIENCE CHINA Physics, Mechanics & Astronomy
影响因子:
--
通讯作者:
Weisheng Zhao
Weisheng Zhao
中科院分区:
其他
文献类型:
--
作者:
Kewen Shi;Wenlong Cai;Sheng Jiang;Daoqian Zhu;Kaihua Cao;Zongxia Guo;Jiaqi Wei;Ao Du;Zhi Li;Yan Huang;Jialiang Yin;Johan Åkerman;Weisheng Zhao

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磁滴是一类高度非线性磁动力孤子,可以在纳米接触自旋扭矩纳米振荡器中成核和稳定。在这里,我们通过实验演示了磁性隧道结(MTJ)中的磁性液滴。与铁磁共振模式相比,液滴成核伴随着功率增强。液滴的成核和稳定归因于全垂直 MTJ 中的双 CoFeB 自由层结构,它提供了低张力扭矩和高钉扎场。我们的研究结果使液滴的基础研究具有更好的电灵敏度,并表明这些液滴可用于基于 MTJ 的应用和材料科学。
Magnetic droplets, a class of highly nonlinear magnetodynamic solitons, can be nucleated and stabilized in nanocontact spin-torque nano-oscillators. Here we experimentally demonstrate magnetic droplets in magnetic tunnel junctions (MTJs). The droplet nucleation is accompanied by power enhancement compared with its ferromagnetic resonance modes. The nucleation and stabilization of droplets are ascribed to the double-CoFeB free-layer structure in the all-perpendicular MTJ, which provides a low Zhang-Li torque and a high pinning field. Our results enable better electrical sensitivity in fundamental studies of droplets and show that the droplets can be utilized in MTJ-based applications and materials science.
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