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采用射频共溅射方法制备了FexZn1-xO (x=0.80, 0.86, 0.93)非晶薄膜, 该薄膜具有较强的室温铁磁性, 制备态的Fe0.93Zn0.07O 的饱和磁化强度Ms可达333.29 emu/cm3, 磁性能是各向同性的. 与多晶的FexZn1-xO (x≤ 20%)不同的是样品出现了明显的异常霍尔效应(AHE), 样品均为n型半导体, 载流子浓度约为1019—1020 cm-3. 退火后的样品在低温222 K 下存在着电阻极小值现象. 薄膜的低温电阻导电机理属于自旋依赖的电子变程跃迁机理, 上述实验结果表明高Fe含量的非晶FeZnO体系有作为新型自旋电子学器件材料的可能.The FexZn1-xO (x=0.80, 0.86, 0.93)amorphous films were fabricated by RF sputtering method. The films each have a strong ferromagnetism at room temperature. The saturation magnetization Ms can reacl 333.29 emu/cm3 in the as-sputtered Fe0.93Zn0.07O. Magnetism is isotropic. The sample obviously exhibits an anomalous Hall effect, which is different from the polycrystalline FexZn1-xO (x≤ 20%). The samples are of n-type semiconductor, with a carrier concentration of about 1019—1020 cm-3. After being annealed, the samples each present a resistance minimum phenomenon at a low temperature (222 K). The conductive mechanism is of the spin dependent variable range hopping resistance in the low-temperature. The experimental results show that amorphous FeZnO system of high Fe composition is a potential candidate of the new spintronic device materials.
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Keywords:
- amorphous FeZnO /
- anomalous Hall effect /
- magnetic semiconductor /
- spinpolarized transport







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