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Superspin glass behavior of amorphous FeO-SiO_2 thin films

机译：非晶态FeO-SiO_2薄膜的超旋玻璃行为

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摘要

We have prepared amorphous xFeO·(100-x)SiO_2 (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 Fe~(2+) ions in the amorphous FeO-SiO_2 thin films and that the intercluster interactions bring about the superspin glass transition at low temperatures.
机译：我们通过脉冲激光沉积法制备了非晶xFeO·（100-x）SiO_2（x = 38.2，54.8，and 67.5 in mol％）薄膜，并研究了它们的磁性。零场冷却的磁化强度的温度依赖性显示出尖峰状的峰，即在低温区域中的自旋冻结。自旋冻结温度取决于交流磁场的频率，并且可以根据比例定律解释这种依赖性。还观察到了旋转玻璃的老化记忆效应特性。此外，在高温下，磁化强度随磁场的变化而发现超顺磁行为。这些观察结果表明，在非晶态FeO-SiO_2薄膜中存在Fe〜（2+）离子的磁性团簇，团簇间的相互作用导致了低温下的超自旋玻璃化转变。

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  • 来源
    《Japanese journal of applied physics》 |2014年第5s1期|05FB11.1-05FB11.5|共5页
  • 作者

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

  • 作者单位

    Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan;

    Materials Research Institute and Department of Materials Science and Engineering,Pennsylvania State University, University Park, PA 16802, U.S.A.;

    Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan;

    Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan;

    Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan;

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