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Effects of annealing condition on the structural and magnetic properties of FePt thin films

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4 Author(s)
Chang Hoi Park ; Div. of Metals, Korea Inst. of Sci. & Technol., Seoul, South Korea ; Jong Gab Na ; Pyung Woo Jang ; Seong-Rae Lee

Equiatomic FePt films were deposited by a dc sputtering method and annealed in the air and in a vacuum at 350°C for up to 60 min. The order-disorder transformation occurs almost entirely within 10 min and a very high coercivity of 6.8 kOe could be obtained in the air-annealed films while the transformation occured very slowly in the vacuum-annealed films. This higher transformation rate could be also verified in the X-ray diffraction analysis. The reason for the higher rate seems to be the diffusion of oxygen atoms and possible mechanism was discussed

Published in:

IEEE Transactions on Magnetics  (Volume:35 ,  Issue: 5 )