摘要:
选取高居里温度(Tc约350 K)、高自旋极化率的La0.7Sr0.3MnO3为磁性相，弱磁性的稀磁半导体材料Zn0.95Co0.05O作为边界材料，采用溶胶-凝胶法制备La0.7Sr0.3MnO3:xZn0.95Co0.05O (x = 0.0, 0.1, 0.2, 0.3, 0.4 mol)复合体系。对样品的结构、电磁输运特性测量结果分析表明，边界材料对磁电阻的影响显著，x值增大导致磁电阻增加；当加上小磁场后，出现了低场下的高磁电阻。
Abstract:
Selecting high Curie temperature (Tc = 350 K) and high spin polarization La0.7Sr0.3MnO3 as mag-netic phase, weak magnetic dilute magnetic semiconductor materials Zn0.95Co0.05O as border material, La0.7Sr0.3MnO3:xZn0.95Co0.05O (x = 0.0, 0.1, 0.2, 0.3, 0.4 mol) composite was prepared by sol- gel method. The results measuring crystal structure and electromagnetic transport properties indicated that, boundary materials have effect on the magnetic resistance significantly; magnetic resistance increases with the x value; with small magnetic field, the low field's high magnetic resistance exists.