Method for Measurement of Switching-Field Distribution of Heat-Assisted Magnetic Recording Media

Author

Hongzhi Yang ; Yunjie Chen ; Siang Huei Leong ; Chengwu An ; Kaidong Ye ; Jing Zhang ; Hu, J.F.

Author_Institution

Data Storage Inst., Agency for Sci., Technol. & Res. (A*STAR), Singapore, Singapore

Volume

6

fYear

2015

fDate

2015

Firstpage

1

Lastpage

4

Abstract

Due to increased emphasis on heat-assisted magnetic recording (HAMR), the characterization of the intrinsic switching-field distribution (iSFD) at elevated media temperatures has become important. In this paper, we introduce an efficient method to measure iSFD based on optical heating and magnetooptic Kerr effect 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 iSFD of FePt granular media was measured. We observe iSFD broadening of HAMR media at elevated temperatures, which is consistent with theoretical predictions.

Keywords

Kerr magneto-optical effect; granular materials; iron alloys; magnetic hysteresis; perpendicular magnetic recording; platinum alloys; thermomagnetic recording; FePt; FePt granular media; elevated media temperatures; heat-assisted magnetic recording media; hysteresis loops; intrinsic switching-field distribution broadening; magnetooptic Kerr effect measurement; optical heating powers; perpendicular magnetic recording media; Heating; Magnetic field measurement; Magnetic hysteresis; Magnetic recording; Media; Optical variables measurement; Temperature measurement; FePt granular media; General topics; Heat assisted magnetic recording; Information storage; heat-assisted magnetic recording; information storage; switching field distribution;

fLanguage

English

Journal_Title

Magnetics Letters, IEEE

Publisher

ieee

ISSN

1949-307X

Type

jour

DOI

10.1109/LMAG.2015.2419591

Filename

7079384