期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 317, 期 1-2, 页码 53-60出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.04.015
关键词
magnetic oxide
We have studied the field and temperature dependence of the magnetic moment of single crystalline sapphire substrates with different surface orientations. All the substrates show a ferromagnetic behavior that partially changes after surface cleaning. The amount of magnetic impurities in the substrates was determined by particle induced X-ray emission. The overall analysis of the data indicates that the magnetic impurities very likely contribute to the measured ferromagnetic behavior but does not rule out completely intrinsic contributions. Our work stresses the necessity to use other than bulk characterization methods for the study of weak ferromagnetic signals of thin films grown on oxide substrates. (c) 2007 Elsevier B. V. All rights reserved.
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