Superspin glass behavior of amorphous FeO-SiO2 thin films

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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
Volume53
Issue number5 SPEC. ISSUE 1
DOIs
Publication statusPublished - Jan 1 2014
Externally publishedYes

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freezing
Glass
Thin films
magnetization
glass
thin films
cusps
magnetic fields
scaling laws
spin glass
pulsed laser deposition
Freezing
magnetic properties
Magnetization
Temperature
temperature dependence
Magnetic fields
Spin glass
Scaling laws
Pulsed laser deposition

All Science Journal Classification (ASJC) codes

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

Cite this

Superspin glass behavior of amorphous FeO-SiO2 thin films. / Nakatsuka, Yuko; Akamatsu, Hirofumi; Murai, Shunsuke; Fujita, Koji; Tanaka, Katsuhisa.

In: Japanese Journal of Applied Physics, Vol. 53, No. 5 SPEC. ISSUE 1, 05FB11, 01.01.2014.

Research output: Contribution to journalArticle

Nakatsuka, Y, Akamatsu, H, Murai, S, Fujita, K & Tanaka, K 2014, 'Superspin glass behavior of amorphous FeO-SiO2 thin films', Japanese Journal of Applied Physics, vol. 53, no. 5 SPEC. ISSUE 1, 05FB11. https://doi.org/10.7567/JJAP.53.05FB11
Nakatsuka, Yuko ; Akamatsu, Hirofumi ; Murai, Shunsuke ; Fujita, Koji ; Tanaka, Katsuhisa. / Superspin glass behavior of amorphous FeO-SiO2 thin films. In: Japanese Journal of Applied Physics. 2014 ; Vol. 53, No. 5 SPEC. ISSUE 1.
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