Superspin glass behavior of amorphous FeO-SiO2 thin films

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

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1 Citation (Scopus)


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.

Original languageEnglish
Article number05FB11
JournalJapanese journal of applied physics
Issue number5 SPEC. ISSUE 1
Publication statusPublished - May 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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