Giant magnetorefractive effect in magnetic granular CoFe-MgF alloys
Giant magnetorefractive effect in magnetic granular CoFe-MgF alloys
复制标题
磁性颗粒CoFe-MgF合金中的巨磁折射效应
DOI：
10.1134/1.1575334
复制
发表时间：
2003
影响因子：
0.6
通讯作者：
M. Inoue
中科院分区：
文献类型：
--
作者：
A. Granovskiǐ;V. Gushchin;I. Bykov;A. Kozlov;N. Kobayashi;S. Ohnuma;T. Masumoto;M. Inoue
本文报道了用红外光谱（5-20 μm）研究CoFe-MgF颗粒的磁折射效应的色散和场依赖性（金属-绝缘体）系统，在接近逾渗阈值的组成中，在1700 Oe的磁场中，隧道磁电阻为7.5%。7 μm的磁光反射率约为0.1%，而在10- 12 μm区域，这种变化达到了1.2- 1.5%的创纪录高值，超过了IR范围内通常的奇数和偶数磁光反射率两个数量级。隧穿导电磁性系统中的磁折射效应起源于自旋相关的高频隧穿。
This paper reports on an IR study (5–20 µm) of the dispersion and field dependences of the magnetorefractive effect in granular CoFe-MgF (metal-insulator) systems, which exhibit, in compositions close to the percolation threshold, a tunneling magnetoresistance of 7.5% in a field of 1700 Oe. The change in the reflectivity ofp-polarized light under magnetization in the IR spectral region 5–7 µm is of the order of 0.1%, while in the 10-to 12-µm region, this change, reaches record-high values of 1.2–1.5%, which exceed the usual odd and even magnetooptic reflectivities in the IR range by two orders of magnitude. The magnetorefractive effect in magnetic systems with tunneling conduction originates from spin-dependent high-frequency tunneling.