Co-occurrence of superparamagnetism and anomalous Hall effect in highly reduced cobalt-doped rutile TiO2-δ films -: art. no. 166601
Co-occurrence of superparamagnetism and anomalous Hall effect in highly reduced cobalt-doped rutile TiO2-δ films -: art. no. 166601
复制标题
DOI：
10.1103/physrevlett.92.166601
复制
发表时间：
2004-04-23
影响因子：
8.6
通讯作者：
Venkatesan, T
中科院分区：
文献类型：
--
作者：
Shinde, SR;Ogale, SB;Venkatesan, T
我们报告了一个详细的磁性和结构分析的高度还原钴掺杂金红石型TiO 2-δ薄膜显示异常霍尔效应（AHE）。磁化强度的温度和场依赖性以及透射电子显微镜清楚地确定了在界面处的膜中存在类似于8 -10 nm尺寸的纳米尺寸的超顺磁性钴簇。超顺磁性和AHE的共同出现提出了关于使用AHE作为稀释磁性半导体中铁磁性的内在性质的测试的问题。
We report a detailed magnetic and structural analysis of highly reduced Co doped rutile TiO2-delta films displaying an anomalous Hall effect (AHE). The temperature and field dependence of magnetization, and transmission electron microscopy, clearly establish the presence of nanosized superparamagnetic cobalt clusters of similar to8-10 nm size in the films at the interface. The co-occurrence of superparamagnetism and AHE raises questions regarding the use of the AHE as a test of the intrinsic nature of ferromagnetism in diluted magnetic semiconductors.