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High coercivity γ-(Fe,Co,Mn)2O3 thin films for magnetic recording

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6 Author(s)
Chang, W.D. ; Dept. of Mater. Sci. & Eng., Tsing Hua Univ., Hsinchu, Taiwan ; Chin, T.S. ; Tu, S.C. ; Li, B.H.
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Thin (Fe,Co,Mn)3O4 films were deposited in-situ on a Si substrate under well controlled O2 partial pressure by dc-reactive magnetron sputtering. The coercivity of as-deposited magnetite films is around 400~640 Oe. After oxidation at 360°C for 90 minutes, the films transform to maghemite γ-(Co,Mn,Fe)2O3 completely, and the coercivity is increased 1~7 times to 640~3500 Oe, depending on the target composition. The origin of coercivity enhancement is attributed to magneto-anisotropy which is induced by the interfacial stress of the films and the directional order imposed by Co and Mn

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )