Optimization of Soft Layer Uniaxial Anisotropy Gradient in Media for Microwave-Assisted Magnetic Recording

Exchange-coupled composite (ECC), notched, and graded anisotropy recording media were optimized for microwave-assisted magnetic recording at head-medium spacings from 4.5 to 14.5 nm. When the average value of uniaxial anisotropy ( K_{u} ) in the soft layer was low, notched media gave the best record...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-04, Vol.58 (4), p.1-9
Main Authors: Greaves, Simon John, Itagaki, Ryo, Kanai, Yasushi
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Anisotropy
Exchange-coupled composite (ECC)
graded
Magnetic heads
Magnetic recording
Magnetic storage
Magnetism
Magnetization
Media
media optimization
microwave-assisted magnetic recording (MAMR)
notched
Optimization
Recording instruments
Saturation magnetization
Signal to noise ratio
Switches
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Summary:Exchange-coupled composite (ECC), notched, and graded anisotropy recording media were optimized for microwave-assisted magnetic recording at head-medium spacings from 4.5 to 14.5 nm. When the average value of uniaxial anisotropy ( K_{u} ) in the soft layer was low, notched media gave the best recording performance. As the average soft layer K_{u} increased, first ECC and then graded anisotropy media became optimal. When the hard layer K_{u} was high, notched media outperformed graded anisotropy media. However, the performance of graded anisotropy media improved as the hard layer K_{u} was reduced, and when the hard layer K_{u} was sufficiently small, graded anisotropy media were preferred.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3128644