浓磁半导体材料的制备、磁性和自旋极化的输运  

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

作　　者：颜世申[1] 梅良模[1] 陈延学[1] 刘国磊[1] 宋红强[1] 张云鹏[1] 田玉峰[1] 乔瑞敏[1] 

机构地区：[1]山东大学物理学院,山东济南250100

出　　处：《山东大学学报（理学版）》2011年第10期81-85,共5页Journal of Shandong University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2007CB924903);国家自然科学面上基金资助项目(10974120);山东省杰出青年基金资助项目(JQ200901)

摘　　要：成功制备出过渡金属元素含量高的Zn1-xCoxO、Ti1-xCoxO2、(In1-xCox)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。A series of Zn1-xCOxO, Ti1-xCoxO2, （In1-xCOx ）2O3 magnetic 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.

关 键 词：磁性半导体 铁磁性 自旋极化的输运 

分 类 号：TN304[电子电信—物理电子学]