Micromagnetic Model Analysis of Various Spin-Torque Oscillators With Write Head for Microwave-Assisted Magnetic Recording

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 do...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2017-11, Vol.53 (11), p.1-5
Main Authors: Kanai, Yasushi, Itagaki, Ryo, Greaves, Simon J., Muraoka, Hiroaki
Format: Article
Language:English
Subjects:
Analytical models
Computer simulation
Magnetic fields
Magnetic heads
Magnetic recording
Magnetism
Magnetization
Micromagnetic simulation
Micromagnetics
microwave-assisted magnetic recording (MAMR)
Oscillators
Reflection
spin torque oscillator (STO)
Torque
write heads
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Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2701398