Transport and magnetic properties of epitaxial and polycrystalline magnetite thin films
Transport and magnetic properties of epitaxial and polycrystalline magnetite thin films
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DOI：
10.1063/1.367547
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发表时间：
1998-06-01
影响因子：
3.2
通讯作者：
Gong, GQ
中科院分区：
文献类型：
--
作者：
Li, XW;Gupta, A;Gong, GQ
对在单晶MgO(100)和SrTiO₃(100)衬底上外延生长以及在多晶SrTiO₃衬底上具有多种晶粒取向的磁铁矿（Fe₃O₄）薄膜的输运和磁性进行了研究。这些薄膜是利用脉冲激光沉积法生长的，并且其外延质量通过离子沟道测量来确定。对Fe₃O₄薄膜作为厚度和形态函数的输运和磁性研究表明，外延应变和生长缺陷会影响维耳威转变的宽度和温度。此外，这些因素还显著影响薄膜的矫顽磁力。对外延和多晶薄膜作为温度函数的低场磁阻（MR）行为进行了比较，发现它们非常相似，这表明晶界对磁阻的贡献非常小。（C）1998美国物理学会。[S0021 - 8979(98)17911 - 2]
The transport and magnetic properties of magnetite (Fe3O4) thin Films grown epitaxially on single crystal MgO(100) and SrTiO3(100) substrates, and with multiple grain orientations on polycrystalline SrTiO3 substrates, have been investigated. The films an grown using pulsed laser deposition and their epitaxial quality determined using ion channeling measurements. Transport and magnetic studies of Fe3O4 films as a function of thickness and morphology suggest that epitaxial strain and growth defects affect the width and temperature of the Verwey transition. In addition, these factors also significantly influence the magnetic coercivity of the films. The low-field magnetoresistance (MR) behaviors of epitaxial and polycrystalline films as a function of temperature have been compared and they were found to be quite similar, suggesting very small contribution to the MR from grain boundaries. (C) 1998 American Institute of Physics. [S0021-8979(98)17911-2].