TY - JOUR
T1 - Micromagnetic Model Analysis of Various Spin-Torque Oscillators with Write Head for Microwave-Assisted Magnetic Recording
AU - Kanai, Yasushi
AU - Itagaki, Ryo
AU - Greaves, Simon J.
AU - Muraoka, Hiroaki
N1 - Funding Information:
ACKNOWLEDGMENT This work was supported in part by JSPS Kaken-hi under Grant 16K06321 and in part by the Advance Storage Research Consortium. The authors would like to thank the software support from JSOL, Japan.
Publisher Copyright:
© 2017 IEEE.
PY - 2017/11
Y1 - 2017/11
N2 - A micromagnetic model analysis was carried out considering two types of write heads and three types of spin-torque oscillators (STOs). For write heads, we considered a small-sized head to reduce calculation time and a large-sized head with dimensions close to commercial heads. For STOs, we used a double-layered STO with reflection spin torque, a double-layered STO with transmission spin torque, and a tri-layered STO with two spin injection layers. We also carried out micromagnetic simulations of the STOs without the write heads (isolated STO) to compare the oscillation states. It was found that, compared with isolated STOs in a uniform applied field, a larger applied field was necessary for STOs integrated into a write head. This result shows that the write head should be designed to generate a large, well-shaped gap field to ensure stable STO oscillation.
AB - A micromagnetic model analysis was carried out considering two types of write heads and three types of spin-torque oscillators (STOs). For write heads, we considered a small-sized head to reduce calculation time and a large-sized head with dimensions close to commercial heads. For STOs, we used a double-layered STO with reflection spin torque, a double-layered STO with transmission spin torque, and a tri-layered STO with two spin injection layers. We also carried out micromagnetic simulations of the STOs without the write heads (isolated STO) to compare the oscillation states. It was found that, compared with isolated STOs in a uniform applied field, a larger applied field was necessary for STOs integrated into a write head. This result shows that the write head should be designed to generate a large, well-shaped gap field to ensure stable STO oscillation.
KW - Micromagnetic simulation
KW - microwave-assisted magnetic recording (MAMR)
KW - spin torque oscillator (STO)
KW - write heads
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U2 - 10.1109/TMAG.2017.2701398
DO - 10.1109/TMAG.2017.2701398
M3 - Article
AN - SCOPUS:85032918474
VL - 53
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 11
M1 - 7920369
ER -