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Magnetic properties of mixed-valence iron phosphate glasses

机译：混合价磷酸铁玻璃的磁性

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摘要

Magnetic properties of mixed-valence iron phosphate glasses, where there coexist Fe~(2+) and Fe~(3+) ions, have been investigated. The molar fraction of Fe~(3+) with respect to the total iron ion, [Fe~(3+)]/[Fe_(tota)]], can be controlled by melting the glass at varied temperatures. Experiments of magnetic aging and memory effects as well as dynamic and static scaling analyses of relaxation time and nonlinear magnetic susceptibility have been performed to get insight into the nature of low-temperature magnetic phase of the glass system. The experimental results reveal that the iron phosphate glasses undergo paramagnet-spin-glass transitions at low temperatures. Temperature dependence of magnetic specific heat suggests that as the temperature is lowered, the magnetic moments start to be frozen at a temperature significantly higher than the spin-glass transition temperature accompanied by a deviation in magnetic susceptibility from Curie-Weiss law. The ratio of the absolute value of Weiss temperature to spin-glass transition temperature increases as the ratio [Fe~(3+)]/[Fe_(total)] becomes larger. This behavior is explainable in terms of the difference in single-ion anisotropy between Fe~(3+) and Fe~(2+) ions.
机译：研究了Fe〜（2+）和Fe〜（3+）离子共存的混合价磷酸铁玻璃的磁性。 Fe〜（3+）相对于总铁离子的摩尔分数[Fe〜（3 +）] / [Fe_tota]]可以通过在不同温度下熔融玻璃来控制。已经进行了磁老化和记忆效应的实验，以及弛豫时间和非线性磁化率的动态和静态缩放分析，以了解玻璃系统低温磁相的性质。实验结果表明，磷酸铁玻璃在低温下会经历顺磁性-自旋玻璃转变。磁比热的温度依赖性表明，随着温度降低，磁矩开始冻结在明显高于自旋玻璃化转变温度的温度下，并伴随着磁化率偏离居里-魏斯定律。魏斯温度与自旋玻璃化转变温度的绝对值之比随着[Fe〜（3 +）] / [Fe_（total）]之比的增大而增大。这种行为可以用Fe〜（3+）和Fe〜（2+）离子之间的单离子各向异性差异来解释。

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  • 来源
    《Physical review》 |2009年第13期|134408.1-134408.9|共9页
  • 作者

    Hirofumi Akamatsu; Satoshi Oku; Koji Fujita; Shunsuke Murai; Katsuhisa Tanaka;

  • 作者单位

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

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

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

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

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

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  • 正文语种 eng
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  • 关键词

    spin glasses and other random magnets;

    机译：自旋眼镜和其他随机磁铁;

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