TY - JOUR
T1 - Micromagnetic Model Analysis of Spin-Transfer Torque Oscillator and Write Heads for Microwave-Assisted Magnetic Recording
AU - Kanai, Yasushi
AU - Yoshida, Kazuetsu
AU - Greaves, Simon
AU - Muraoka, Hiroaki
N1 - Publisher Copyright:
© 1965-2012 IEEE.
PY - 2017/2
Y1 - 2017/2
N2 - A micromagnetic model analysis was used to investigate spin-transfer torque oscillators (STOs) and magnetic write heads for microwave-assisted magnetic recording (MAMR). Our goal was to propose STOs, the Gilbert damping constant of the write head, and write head configurations that allow the STO element to operate at a low injected current density J. First, we derived the write head field and field generation layer rotations for various models with various main pole (MP) widths and MP throat heights. Second, we used the write head model and tried to reduce J by optimizing the Gilbert damping constant of the write head. Then, we used various STOs and write head structures and derived STO fields, clockwise and counterclockwise components, and FGL angles versus J. Finally, we performed media recording simulations and noted some challenges in the MAMR simulations.
AB - A micromagnetic model analysis was used to investigate spin-transfer torque oscillators (STOs) and magnetic write heads for microwave-assisted magnetic recording (MAMR). Our goal was to propose STOs, the Gilbert damping constant of the write head, and write head configurations that allow the STO element to operate at a low injected current density J. First, we derived the write head field and field generation layer rotations for various models with various main pole (MP) widths and MP throat heights. Second, we used the write head model and tried to reduce J by optimizing the Gilbert damping constant of the write head. Then, we used various STOs and write head structures and derived STO fields, clockwise and counterclockwise components, and FGL angles versus J. Finally, we performed media recording simulations and noted some challenges in the MAMR simulations.
KW - Micromagnetic simulation
KW - microwave-assisted magnetic recording (MAMR)
KW - spin injected current
KW - spin-transfer torque oscillator (STO)
KW - write heads
UR - http://www.scopus.com/inward/record.url?scp=85027526705&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85027526705&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2016.2606494
DO - 10.1109/TMAG.2016.2606494
M3 - Article
AN - SCOPUS:85027526705
VL - 53
SP - 1
EP - 11
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 2
ER -