2008年11月
Improvement of magnetic properties and read/write characteristics in SmCo(5) perpendicular thin films
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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- 巻
- 320
- 号
- 22
- 開始ページ
- 3075
- 終了ページ
- 3078
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1016/j.jmmm.2008.08.067
- 出版者・発行元
- ELSEVIER SCIENCE BV
An SmCo(5) alloy is a promising candidate for ultra-high density magnetic recording media because of its strong uniaxial magnetocrystalline anisotropy, whose constant, K(u), is more than 1.1 x 10(8) erg/cm(3). Recently, we successfully obtained high perpendicular magnetic anisotropy for a sputter-deposited SmCo(5) thin film by introducing a Cu/Ti dual underlayer. However, it is necessary to improve magnetic properties and read/write (R/W) characteristics for applying SmCo(5) thin films to perpendicular magnetic recording media. In this study, we focused on reduction of magnetic domain size and change of a magnetization reversal process of SmCo(5) perpendicular magnetic thin. films by introducing carbon (C) atoms into the constituent Cu underlayer. The magnetic domain size became small and the ratio of coercivity (H(c)) against magnetic anisotropy (H(k)) which is an index of the magnetization reversal process was increased by adding C atoms. We also evaluated the R/W characteristics of SmCo(5) double-layered media including C atoms. The medium noise was decreased and signal-to-noise ratio increased by introducing the C. The addition of C into the Cu underlayer is effective for changing the magnetization reversal process, reducing medium noise and increasing SNR. (C) 2008 Published by Elsevier B. V.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jmmm.2008.08.067
- ISSN : 0304-8853
- CiNii Articles ID : 80019955697
- Web of Science ID : WOS:000260137800054