DC Bias Reversal Behavior of Spin-Torque Ferromagnetic Resonance Spectra in CoFeB/MgO/CoFeB Perpendicular Magnetic Tunnel Junction

被引：2
|
作者：
Yu, Tian [1 ,2 ]
Naganuma, Hiroshi [2 ]
Oogane, Mikihiko [2 ]
Ando, Yasuo [2 ]
机构：
[1] Sichuan Univ, Coll Phys Sci & Technol, Chengdu 610064, Sichuan, Peoples R China
[2] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2017年 / 53卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Ferromagnetic resonance; perpendicular magnetic tunnel junction (p-MTJ); spin-transfer torque;
D O I：
10.1109/TMAG.2017.2707081
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Spin-torque ferromagnetic resonance (ST-FMR) spectra of nano-scaled CoFeB/MgO/CoFeB full perpendicular magnetic tunnel junctions (p-MTJs) were investigated, especially in detail at low dc-bias voltage region. Usually in in-plane magnetized MTJs (i-MTJs), the ST-FMR spectrum line shape reverses its symmetry as switching dc-bias voltage polarities; however, it is found that in the p-MTJs the line shape reversal behaves differently, that not only the spectrum shows anti-symmetric line shape at zero dc bias but also the dependence of reversal symmetry on dc bias is broken. Based on the framework of homodyne-detected ST-FMR, we extracted the parameters characterizing the spectra and discussed the possible factors resulting these differences.
引用
收藏
页数：5
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