Analysis of Effective Field Gradient in Microwave-Assisted Magnetic Recording

Author

Narita, Naoyuki ; Yamada, Koji ; Taguchi, Tomoko ; Matsumoto, Tad ; Koi, Katsuhiko ; Takeo, Akihiko

Author_Institution

Toshiba Corp., Kawasaki, Japan

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

4

Abstract

Microwave-assisted magnetic recording (MAMR) is one of the promising techniques for future high recording density hard disk drives. In this paper, we estimate the effective field gradient in MAMR using the relation between recorded transition length πa and field gradient by dynamic write process simulation. The effective field gradients reach 600 and 700 Oe/nm on each optimum field generation layer (FGL)-position and FGL oscillation frequency when the microwave field strength (c - H_ac) are 700 and 950 Oe, respectively. These results indicate extremely high linear density would be possible by MAMR.

Keywords

disc drives; hard discs; magnetic recording; FGL oscillation frequency; MAMR; dynamic write process simulation; effective field gradient; field generation layer position; high recording density hard disk drives; linear density; microwave field strength; microwave-assisted magnetic recording; Magnetic heads; Magnetic recording; Magnetization; Mathematical model; Microwave oscillators; Microwave theory and techniques; Field gradient; hard disks; microwave-assisted magnetic recording (MAMR); transition length;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2327235

Filename

6971628