Superspin glass behavior of amorphous FeO-SiO2 thin films

Yuko Nakatsuka, Hirofumi Akamatsu, Shunsuke Murai, Koji Fujita, Katsuhisa Tanaka

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

We have prepared amorphous xFeO"(100 % x)SiO2 (x = 38.2, 54.8, and 67.5 in mol%) thin films by a pulsed laser deposition method and examined their magnetic properties. The temperature dependence of zero-field-cooled magnetization manifests a cusp-like peak, i.e., spin-freezing in a low temperature region. The spin-freezing temperature depends on the frequency of ac magnetic field, and the dependence is explainable in terms of the scaling law. The aging-memory effect characteristic of spin glass is also observed. Furthermore, superparamagnetic behavior is found in the variation of magnetization with magnetic field at high temperatures. These observations indicate that there exist magnetic clusters of Fe2+ ions in the amorphous FeO-SiO2 thin films and that the intercluster interactions bring about the superspin glass transition at low temperatures.

本文言語英語
論文番号05FB11
ジャーナルJapanese journal of applied physics
53
5 SPEC. ISSUE 1
DOI
出版ステータス出版済み - 5 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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