Effects of head field and AC field on magnetization reversal for microwave assisted magnetic recording

Microwave assisted magnetic recording (MAMR) is a promising recording method for achieving high recording densities in hard disk drives. In MAMR, the AC field from a spin-torque oscillator (STO) assists the head field with magnetization reversal in a medium. Therefore, the relationship between the h...

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Bibliographic Details
Published in:AIP advances 2018-05, Vol.8 (5), p.056505-056505-5
Main Authors: Kase, Aina, Akagi, Fumiko, Yoshida, Kazuetsu
Format: Article
Language:English
Subjects:
Disk drives
Hard disks
Magnetic fields
Magnetic recording
Magnetic resonance
Magnetization reversal
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Summary:Microwave assisted magnetic recording (MAMR) is a promising recording method for achieving high recording densities in hard disk drives. In MAMR, the AC field from a spin-torque oscillator (STO) assists the head field with magnetization reversal in a medium. Therefore, the relationship between the head field and the AC field is very important. In this study, the effects of the head field and the AC field on magnetization reversal were analyzed using a micromagnetic simulator that takes the magnetic interactions between a single-pole type (SPT) write-head, an exchange coupled composite (ECC) medium, and the STO into account. As a result, the magnetization reversal was assisted not just by the y-component of the AC field (H stoy ) but also by the y-component of the head field (H hy ) in the medium. The H hy over 100 kA/m with a frequency of about 15.5 GHz induced the magnetic resonance. The large H hy was produced by the field from the STO to the SPT head.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5005078