Tunneling giant magnetoresistance in heterogeneous Fe-SiO2 granular films
Tunneling giant magnetoresistance in heterogeneous Fe-SiO2 granular films
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DOI：
10.1103/physrevb.56.14566
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发表时间：
1997-12-01
影响因子：
3.7
通讯作者：
Tokumoto, M
中科院分区：
文献类型：
--
作者：
Honda, S;Okada, T;Tokumoto, M
采用射频溅射法制备了非均相Fe-SiO2颗粒膜，研究了其磁性和输运性能。在铁体积分数小于45%的薄膜中观察到超顺磁性和隧道巨磁电阻。磁化率和磁阻曲线；你是系统肛门吗？由两个朗之万函数求和得到。磁流变比对铁体积分数的依赖性可以用最近邻晶粒表面之间的距离从现象上解释。还讨论了磁流变比的温度依赖性。
Magnetic and transport properties are examined for heterogeneous Fe-SiO2 granular films prepared on glass substrates by rf sputteriug. The superparamagnetic nature and the tunneling giant magnetoresistance are observed in the films having Fe volume fractions smaller than 45%. The magnetization and magnetoresistance (MR) curves;Ire systematically anal?zed by the summation of two Langevin functions. The dependence of the MR ratio on the Fe volume fraction is explained phenomenologically by the distance between the nearest-neighbor grain surfaces. The temperature dependence uf the MR ratio is also discussed.