Hysteresis Loops of Recording Media Grains Under the Influence of High-Frequency Fields

Hysteresis loops of single grains and recording media were calculated under the influence of high-frequency (HF) magnetic fields, similar to those produced by a spin-torque oscillator (STO) in microwave-assisted magnetic recording (MAMR). The effect of the HF field ellipticity and the strength of ma...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 59; no. 3; pp. 1 - 7
Main Authors Greaves, Simon John, Kanai, Yasushi
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Coercive force
Coercivity
Ellipticity
Hysteresis loop
Hysteresis loops
Magnetic heads
Magnetic hysteresis
Magnetic recording
Magnetic storage
Magnetism
Magnetostatics
Media
microwave-assisted magnetic recording (MAMR)
Perpendicular magnetic anisotropy
Recording instruments
Temperature
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Summary:Hysteresis loops of single grains and recording media were calculated under the influence of high-frequency (HF) magnetic fields, similar to those produced by a spin-torque oscillator (STO) in microwave-assisted magnetic recording (MAMR). The effect of the HF field ellipticity and the strength of magnetostatic interactions between grains were investigated. Elliptical HF fields with a major:minor axis ratio of 6:1 were almost as effective as circular HF fields in reducing the media coercivity. For media with a small grain pitch, i.e., strong magnetostatic interactions between grains, the HF field was able to reduce the coercivity by much more than when the grains were far apart, and magnetostatic interactions were weak.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2022.3220717