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Feffornagnetism at 300 K in spin-coated films of Co doped anatase and rutile-TiO2

机译:Co掺杂的锐钛矿型和金红石型TiO2旋涂膜在300 K时的磁效率

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摘要

Thin films of Ti1-xCoxO2 (x = 0 and 0.03) have been prepared on sapphire substrates by spin-on technique starting from metalorganic precursors. When heat treated in air at 550 and 700 degreesC, respectively, these films present pure anatase and rutile structures as shown both by X-ray diffraction and Raman spectroscopy. Optical absorption indicate a high degree of transparency in the visible region. Such films show a very small magnetic moment at 300 K. However, when the anatase and the rutile films are annealed in a vacuum of 1 x 10(-5) Torr at 500 and 600 degreesC, respectively, the magnetic moment, at 300 K, is strongly enhanced reaching 0.36mu(B)/Co for the anatase sample and 0.68mu(B)/Co for the rutile one. The ferromagnetic Curie temperature of these samples is above 350 K. (C) 2004 Elsevier Ltd. All rights reserved.
机译:从金属有机前驱物开始,通过旋涂技术在蓝宝石衬底上制备了Ti1-xCoxO2薄膜(x = 0和0.03)。当分别在550和700℃下在空气中进行热处理时,这些膜呈现纯的锐钛矿和金红石结构,如通过X射线衍射和拉曼光谱法所显示的。光学吸收表明在可见光区域具有高度的透明度。这样的膜在300 K时显示出很小的磁矩。但是,当锐钛矿膜和金红石膜分别在500和600摄氏度的1 x 10(-5)Torr真空中退火时,在300 K时的磁矩,其锐钛矿样品的含量大大增强,达到0.36mu(B)/ Co,金红石型样品达到0.68mu(B)/ Co。这些样品的铁磁居里温度高于350K。(C)2004 Elsevier Ltd.保留所有权利。

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