在玻璃基板上成長之CoPt及CoPt/Ag薄膜的微結構與磁性質研究

黎穎姍

doi:10.6342/NTU.2009.01569

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在玻璃基板上成長之CoPt及CoPt/Ag薄膜的微結構與磁性質研究

The study of microstructures and magnetic properties of CoPt and CoPt/Ag thin films on glass

黎穎姍 , Masters　　Advisor：郭博成　　

繁體中文 DOI： 10.6342/NTU.2009.01569

鈷鉑合金；膜厚小於20nm ；垂直膜面磁性質； Ag底層； CoPt alloy ； the thickness is less than 20nm ； perpendicular anisotropy ； Ag underlayer

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In this study, the CoPt films were deposited on glass substrates at room temperature by dc magnetron sputtering and introduced Ag underlayer to form CoPt/Ag nanocomposite films. The effects of Ag underlayer thickness on the microstructure, magnetic properties, and magnetic easy axis orientation of CoPt films were investigated as the thickness of CoPt films is less than 20 nm.
    The starting ordering temperature of the CoPt thin films is between 500 to 600 °C. From TEM bright field image, it can be seen that the surface image of CoPt formed discrete islands, and gradually change to continuous film as the CoPt thickness increase. After annealed at 700℃ for 30 minutes, the single domain state is found by the observation of MFM images at 7.5 nm CoPt. At single domain state, the variation of coercivity with particle size agree with the theory of single domain particles. Due to the most of particle size are smaller than critical particle diameter Dp at 1 nm CoPt, the effect of superparamagnetism causes the decrease of coercivity. Approximately, the orientation of magnetic easy axis of CoPt thin films is random.
    For CoPt/Ag thin films, The insert of Ag underlayer can help the property of ordering degree and perpendicular anisotropy as CoPt is thicker. By the measurement of VSM, we find the changes of magnetic properties with the increase of CoPt and Ag underlayer thickness are as following : After annealing at 600℃, firstly the coercivity of CoPt thin films increase with CoPt and Ag underlayer thickness, and then decrease. The orientation of magnetic easy axis firstly from random orientation turn to out-of-plane orientation, and then turn back to random orientation as the CoPt thickness is increased; After annealing at 700℃, the coercivity of CoPt thin films increases with CoPt and Ag underlayer thickness. The orientation of magnetic easy axis from random orientation turn to out-of-plane orientation gradually as the CoPt thickness is increased. The phenomenon reveal that the property of perpendicular anisotropy were promote As the Ag underlayer added.

Reference ( 78 ) 〈TOP〉

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