Switching field distribution of CoPtCr-SiO2perpendicular recording media obtained by subtracting thermal agitation of magnetization

T. Shimatsu, T. Kondo, K. Mitsuzuka, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

研究成果: Article査読

6 被引用数 (Scopus)

抄録

The effect of thermal agitations on the switching field distribution (SFD) of CoPtCr-Si02 perpendicular media was investigated, and the “intrinsic” SFD caused by variations in the grain-to-grain switching field was determined. DC demagnetizing (DCD) magnetization curves and minor DCD (M-DCD) magnetization curves were measured at applied field-sweep rates of ~ 10 Oe/s and ~ 108 Oe/s. We estimated the SFD from the difference between the DCD and M-DCD curves, and defined them as ΔHr/Hr (at ~ 10 Oe/s) and Δ Hpr /Hrp (at ~ 108 Oe/s). The values of Δ Hr/Hr were much larger than those of ΔHrp/Hrp. Moreover, Δ Hr/Hr increased faster than ΔHrp /Hrp as the thickness decreased, suggesting that the SFD measured at vibrating sample magnetometer (VSM) time scales is significantly influenced by thermal agitation. The intrinsic SFD estimated using a series of media with various film thicknesses was about 0.14, which was 55%-75% of ΔHr/Hr for 8-16-nm-thick media. An analysis of the temperature dependence of ΔHr/Hr supported this conclusion. It is concluded that the SFD measured at VSM time scales is significantly influenced by thermal agitation of the magnetization, and the intrinsic SFD is likely to be nearly half that measured at VSM time scales.

本文言語English
ページ(範囲)2384-2386
ページ数3
ジャーナルIEEE Transactions on Magnetics
42
10
DOI
出版ステータスPublished - 2006 10

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

フィンガープリント

「Switching field distribution of CoPtCr-SiO<sub>2</sub>perpendicular recording media obtained by subtracting thermal agitation of magnetization」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル