Co纳米粒子对ZnCoAlO磁性的增强作用
Enhanced magnetic properties in ZnCoAlO caused by exchangecoupling to Co nanoparticles
摘要：
本文报道了激光烧蚀ZnCoAlO和ZnCoO（含少量金属钴）薄膜的磁化强度和磁光特性的研究结果。结果进行比较时，所有的磁化是由于孤立的金属簇钴和几乎没有金属夹杂物的氧化物样品的预期。使用各种直接的磁性测量和磁性圆二色性，我们发现，有铁磁性的氧化物和金属夹杂物内，此外，这些磁性成分是交换耦合时，铝被列入。这增强了矫顽场和剩磁。因此，在ZnAlO中存在受控量的金属纳米颗粒可以改善氧化物的磁响应，从而为自旋电子学中的应用提供很大的优势。
英文摘要：
Wereport the results of a sequence of magnetisation and magneto-optical studies on laser ablated thin films of ZnCoAlO and ZnCoO that contain a small amount of metallic cobalt. The results are compared to those expected when all the magnetization is due to isolated metallic clusters of cobalt and with an oxide sample that is almost free from metallic inclusions. Using a variety of direct magnetic measurements and also magnetic circular dichroism we find that there is ferromagnetism within both the oxide and the metallic inclusions, and furthermore that these magnetic components are exchange-coupled when aluminium is included. This enhances both the coercive field and the remanence. Hence the presence of a controlled quantity of metallic nanoparticles in ZnAlO can improve the magnetic response of the oxide, thus giving great advantages for applications in spintronics.
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