A method for switching field distribution measurement of heat assisted magnetic recording media

Author

Yang, Hang Zhou ; Chen, Y.J. ; Leong, S.H. ; An, C.W. ; Ye, K.D. ; Zhang, Juyong ; Hu, Jiang Feng

Author_Institution

Data Storage Inst., Agency for Sci., Technol. & Res., Singapore, Singapore

fYear

2014

fDate

22-23 Sept. 2014

Firstpage

1

Lastpage

2

Abstract

Due to increased emphasis on heat assisted magnetic recording, the characterization of switching field distribution (SFD) at elevated media temperatures has become important. In this paper, we introduce an efficient method to measure SFD based on optical heating and MOKE measurement. The Major and minor hysteresis loops of perpendicular magnetic recording media and FePt granular media were acquired at different optical heating powers. The optical heating power (or temperature) dependent SFD of FePt granular media was measured. We observe SFD broadening of HAMR media at elevated temperatures which is consistent with theoretical predictions.

Keywords

Kerr magneto-optical effect; iron compounds; magnetic recording; FePt; FePt granular media; HAMR media; MOKE measurement; SFD measurement; heat assisted magnetic recording media; hysteresis loops; media temperatures; optical heating power; switching field distribution measurement; Heating; Magnetic field measurement; Magnetic hysteresis; Magnetic recording; Media; Optical variables measurement; Temperature measurement; FePt granular media; Heat assisted magnetic recording; switching field distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Symposium 2014 - Celebrating 50th Anniversary of IEEE Magnetics Society (MSSC50)

Conference_Location

Singapore

Type

conf

DOI

10.1109/MSSC.2014.6947939

Filename

6947939