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Effect of Substrate Temperature on Microstructure and Magnetic Properties of Single-Layered FePt Films

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6 Author(s)
Chen, S.C. ; Dept. of Mater. Eng., Ming Chi Univ. of Technol., Taipei, Taiwan ; Sun, T.H. ; Chang, C.L. ; Su, W.H.
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The single-layered Fe5.4Pt4.6 films with thickness of 30 nm are deposited directly on Si substrate at substrate temperatures (Ts) of 370 to 620°C. The single-layered FePt films incline to random orientation as the Ts is lower than 570°C. Upon increasing the substrate temperature to above 600°C, the peak intensity of (001)FePt is much higher than that of (111)FePt and the perpendicular squareness (S) is also much larger than that of in-plane squareness (S//), indicating that the magnetic anisotropy of FePt film is changed from in-plane to out-of-plane. This finding reveals that a high perpendicular magnetic anisotropy of the FePt film can be obtained as the film is deposited at a higher substrate temperature of 620°C. Its perpendicular coercivity (Hc), perpendicular squareness and magnetization at 20 kOe are as high as 14.0 kOe, 0.96 and 473 emu/cm3, respectively.

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Magnetics, IEEE Transactions on  (Volume:47 ,  Issue: 3 )