Signal-to-Noise Ratio Improvement of MAMR on CoX/Pt Media

Author

Zhen Zhao ; Jiangnan Li ; Longze Wang ; Dan Wei ; Kai-Zhong Gao

Author_Institution

Key Lab. of Adv. Mater., Tsinghua Univ., Beijing, China

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

The signal-to-noise ratio (SNR) gain of microwave-assisted magnetic recording (MAMR) with a spin-transfer oscillator is analyzed by a micromagnetic model simulating the write process on a CoX/Pt media, by including the Voronoi polycrystalline microstructure built upon a regular mesh of micromagnetic cells. With a fixed head of 40 nm-width main pole and a 10.5 kOe maximum perpendicular field, a 2 dB SNR gain is found for low-coercivity media (0 K H_c <; 10 kOe) and a 4 dB gain is obtained for high-coercivity media (0 K H_c > 14 kOe). Besides, the MAMR performance considering the finite rise time of single-pole-type head field in a bit is also calculated. It is found that the MAMR SNR gain is obtained in the media with lower anisotropy because of the weak writing capacity during the rise time.

Keywords

anisotropic media; coercive force; computational geometry; magnetic microwave devices; magnetic recording; micromagnetics; platinum; CoX/Pt media; MAMR; SNR gain; Voronoi polycrystalline microstructure; anisotropic media; gain 2 dB; gain 4 dB; low-coercivity media; micromagnetic cell mesh; micromagnetic model; microwave-assisted magnetic recording; signal-to-noise ratio improvement; spin-transfer oscillator; write process; Anisotropic magnetoresistance; Gain; Magnetic heads; Magnetic recording; Media; Microwave oscillators; Signal to noise ratio; CoX/Pt media; microwave assisted magnetic recording (MAMR); microwave-assisted magnetic recording (MAMR); signal to noise (SNR); signal-to-noise ratio (SNR); spin transfer oscillator (STO); spin-transfer oscillator (STO);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2448419

Filename

7130616