TY - JOUR
T1 - Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction between Write Head and STO and Optimum Injected Current
AU - Kanai, Yasushi
AU - Katayama, Takuto
AU - Yoshida, Kazuetsu
AU - Greaves, Simon
AU - Muraoka, Hiroaki
N1 - Publisher Copyright:
© 2016 IEEE.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/7
Y1 - 2016/7
N2 - The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording (MAMR). To realize MAMR, a small injected STO current is mandatory, as are large amplitude and stable oscillations. In this paper, an isolated STO element (without the write head) and an STO integrated into a write head were analyzed using micromagnetic analysis. First, the integrated STO was used and the optimum injected currents ( Jopts ) that excite high-frequency magnetic fields were derived for various Gilbert damping factors (αs) and saturation magnetization (4πMs) in the field generating layer. Second, Jopts were derived for various isolated STO structures. The effect of the material characteristics on Jopt was also investigated.
AB - The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording (MAMR). To realize MAMR, a small injected STO current is mandatory, as are large amplitude and stable oscillations. In this paper, an isolated STO element (without the write head) and an STO integrated into a write head were analyzed using micromagnetic analysis. First, the integrated STO was used and the optimum injected currents ( Jopts ) that excite high-frequency magnetic fields were derived for various Gilbert damping factors (αs) and saturation magnetization (4πMs) in the field generating layer. Second, Jopts were derived for various isolated STO structures. The effect of the material characteristics on Jopt was also investigated.
KW - Micromagnetic simulation
KW - Spin-Torque oscillator
KW - microwave-assisted magnetic recording
KW - spin injected current
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U2 - 10.1109/TMAG.2015.2508035
DO - 10.1109/TMAG.2015.2508035
M3 - Article
AN - SCOPUS:84977119059
VL - 52
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 7
M1 - 7353178
ER -