High thermal stability in CoPrTb/CoCrTa composite perpendicular media

T. Shimatsu*, H. Muraoka, Y. Nakamura, Y. Sonobe, Y. Satodate, K. Muramatsu, I. Watanabe


研究成果: Article査読

9 被引用数 (Scopus)


Thermal stability and media noise performance of the CoPrTb/CoCrTa composite perpendicular media are discussed. Angular dependence of remanance coercivity and the ΔM plot indicate that magnetization reversal in the CoPrTb/CoCrTa composite media is mainly proceeded by local switching of magnetization, while the magnetization loop of the composite media show very steep slope and large squareness M r/M s compared to those of CoCrTa media. Recording performance of (CoPrTb/CoCrTa)/Ti/CoZrNb double-layered perpendicular media was examined using a single-pole-type write head and a GMR read head. The recording resolution, D 50, of a CoPrTb(10 nm)/CoCrTa(20 nm) composite medium is about 50 kfrpi higher than that of CoCrTa medium, and the signal to medium noise ratio, S/N m, was about 10 dB higher than that of the CoCrTa medium (at 300 kfrpi). The CoPrTb/CoCrTa composite media show very high thermal stability of read back signals even at low recording density, although the value of M r/M s is smaller than 0.9. The continuous CoPrTb layer is assumed to prevent the thermal reversal of individual grains of the CoCrTa layer by the interfacial exchange coupling.

ジャーナルJournal of Applied Physics
10 I
出版ステータスPublished - 2002 5月 15

ASJC Scopus subject areas

  • 物理学および天文学一般


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