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arXiv 0811.0073cond-mat.mtrl-sci
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溅射法生长室温铁磁半导体金红石Ti1-xCoxO2 -δ外延薄膜

Room Temperature Ferromagnetic Semiconductor Rutile Ti1-xCoxO2-δEpitaxial Thin Films Grown by Sputtering Method

Takashi Yamasaki, Tomoteru Fukumura, Masaki Nakano, Kazunori Ueno, Masashi Kawasaki

摘要:

采用直流溅射法在蓝宝石衬底上生长了室温铁磁半导体金红石型Ti 1-xCoxO 2-δ(101)外延薄膜。铁磁磁化,磁性圆二色性,和异常霍尔效应在室温下清晰地观察到在单晶生长的薄膜中的第一次。磁化强度值接近3μB/Co,这与最近通过光谱方法确定的该化合物中的高自旋态Co 2+一致。因此,其原本较大的磁光响应被进一步增强。

英文摘要:

Room temperature ferromagnetic semiconductor rutile Ti1-xCoxO2-δ(101) epitaxial thin films were grown on r-sapphire substrates by a dc sputtering method. Ferromagnetic magnetization, magnetic circular dichroism, and anomalous Hall effect were clearly observed at room temperature in sputter-grown films for the first time. The magnetization value is nearly as large as 3μB/Co that is consistent with the high spin state Co2+ in this compound recently established by spectroscopic methods. Consequently, its originally large magneto-optical response is further enhanced.

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