TY - JOUR
T1 - DC Bias Reversal Behavior of Spin-Torque Ferromagnetic Resonance Spectra in CoFeB/MgO/CoFeB Perpendicular Magnetic Tunnel Junction
AU - Yu, Tian
AU - Naganuma, Hiroshi
AU - Oogane, Mikihiko
AU - Ando, Yasuo
N1 - Funding Information:
ACKNOWLEDGMENT This research was supported in part by the National Natural Science Foundation of China under Grant 11504249 and in part by JSPS through its FIRST Program.
PY - 2017/9
Y1 - 2017/9
N2 - 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.
AB - 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.
KW - Ferromagnetic resonance
KW - perpendicular magnetic tunnel junction (p-MTJ)
KW - spin-transfer torque
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U2 - 10.1109/TMAG.2017.2707081
DO - 10.1109/TMAG.2017.2707081
M3 - Article
AN - SCOPUS:85028915570
VL - 53
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 9
M1 - 7932503
ER -