浓磁半导体材料的制备、磁性和自旋极化的输运

J4 ›› 2011, Vol. 46 ›› Issue (10): 81-85.

浓磁半导体材料的制备、磁性和自旋极化的输运

颜世申,梅良模,陈延学,刘国磊,宋红强,张云鹏,田玉峰,乔瑞敏

山东大学物理学院, 山东济南 250100

收稿日期:2011-08-12 出版日期:2011-10-20 发布日期:2011-10-18
作者简介:颜世申(1967- ),教授,博士生导师, 主要研究方向包括磁性半导体、自旋电子注入半导体、巨磁电阻、层间耦合、纳米软硬磁双相复合、磁化反转机理等。Email:shishenyan@sdu.edu.cn
基金资助:
(1) 国家重点基础研究发展计划项目,2007CB924903,高品质半导体磁性异质结构分子束外延生长和磁性研究。(2) 国家自然科学面上基金项目, NSF No. 10974120,自旋极化电子在磁性半导体及其异质结中的输运研究。(3) 山东省杰出青年基金,JQ200901

The preparation, magnetism, and spin-polarized transport of the concentrated magnetic semiconductors

YAN Shishen, MEI Liangmo, CHEN Yanxue, LIU Guolei, SONG Hongqiang, ZHANG Yunpeng, TIAN Yufeng, QIAO Ruimin

School of Physics, Shandong University, Jinan250100, Shandong, China

Received:2011-08-12 Online:2011-10-20 Published:2011-10-18

摘要/Abstract

摘要：

成功制备出过渡金属元素含量高的Zn_1-xCo_xO、Ti_1-xCo_xO₂、(In_1-xCo_x)2O3铁磁半导体(浓磁半导),发现这些氧化物浓磁半导体具有高于室温的居里温度、高自旋极化率、巨磁光克尔效应等优良材料特性。还对浓磁半导的输运性质进行了系统的实验和理论研究,提出了自旋依赖的电子变程跃迁理论模型。这些用新方法制备的氧化物浓磁半导体,不同于常规的稀磁半导体,有望成为高效自旋注入源和半透明磁光新材料。

关键词: 磁性半导体；铁磁性；自旋极化的输运

Abstract:

A series of Zn_1-xCo_xO、Ti_1-xCo_xO₂、(In_1-xCo_x)2O3magnetic semiconductor films with high concentration of the transitional metal Co element (concentrated magnetic semiconductor) were prepared by sputtering machine. The super performance of the materials, such as the high Currie temperature above room temperature, high spin polarization ratio, and large magneto-optical Kerr effect were found in the concentrated magnetic semiconductor films. The electric transport properties were also systematically studied by experiments and theories, and a spin dependent variable range hopping model was proposed. The concentrated magnetic semiconductors are different from the conventional dilute magnetic semiconductors, and they may become good spin injection source and new transparent magneto-optical material.

Key words: magnetic semiconductor; ferromagnetism; spin-polarized transport

颜世申,梅良模,陈延学,刘国磊,宋红强,张云鹏,田玉峰,乔瑞敏. 浓磁半导体材料的制备、磁性和自旋极化的输运[J]. J4, 2011, 46(10): 81-85.

YAN Shishen, MEI Liangmo, CHEN Yanxue, LIU Guolei, SONG Hongqiang, ZHANG Yunpeng, TIAN Yufeng, QIAO Ruimin. The preparation, magnetism, and spin-polarized transport of the concentrated magnetic semiconductors[J]. J4, 2011, 46(10): 81-85.

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