Influence of antiphase boundary density on the conduction noise properties of epitaxial magnetite thin films
Influence of antiphase boundary density on the conduction noise properties of epitaxial magnetite thin films
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DOI：
10.1063/1.1854439
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发表时间：
2005-05
影响因子：
3.2
通讯作者：
S. Arora;R. Sofin;I. Shvets;Ravi Kumar;M. W. Khan;J. Srivastava
中科院分区：
文献类型：
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作者：
S. Arora;R. Sofin;I. Shvets;Ravi Kumar;M. W. Khan;J. Srivastava
研究了具有不同密度反相边界（apb）的外延磁铁矿（Fe3O4）薄膜的低频传导噪声（1∕f噪声）随温度和频率的变化特性。在所有薄膜中，噪声的温度依赖性表现出与电阻率相似的特性。归一化噪声的大小（Sv∕V2）随膜厚的增加而减小，且与apb的密度密切相关。噪声的定量特征，即Hooge参数在低温下具有很强的厚度依赖性，这意味着apb在决定外延Fe3O4薄膜的输运机制中起着重要作用。
Low frequency conduction noise (1∕f noise) properties of epitaxial magnetite (Fe3O4) thin films having a varying density of antiphase boundaries (APBs) were investigated as a function of temperature and frequency. Temperature dependence of noise exhibits a similar behavior to that of resistivity for all the films. The magnitude of normalized noise (Sv∕V2) decreases with the increasing film thickness, which correlates well with the density of APBs. The quantitative feature of noise, i.e., Hooge parameter has a strong thickness dependence at low temperatures which implies that the APBs play an important role in determining the transport mechanism in epitaxial Fe3O4 films.