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Modulating the Magneto-Crystalline Anisotropy and the Exchange Bias Field in CoFe/(Co,Fe)O Bilayers Using Ion-Beam Bombardment and Single Crystalline Substrates

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5 Author(s)
Shueh, C. ; Dept. of Mater. Sci. & Eng., Nat. Chung Hsing Univ., Taichung, Taiwan ; Cortie, D.L. ; Klose, F. ; van Lierop, J.
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We report the effects of ion-beam bombardment on the room temperature and low temperature magnetic properties of ferromagnetic CoFe/antiferromagnetic (Co,Fe)O thin film bilayers. The films were deposited onto amorphous SiO2 and single crystalline MgO (110)/(100) substrates. Magnetometry showed that ion-beam bombardment was capable of modifying the coercivity and loop shape for the thin film system at room temperature, corresponding to alteration of the effective magneto-crystalline anisotropy field. After field cooling to 50 K, a shifted hysteresis loop was seen for those films containing a proportion of the antiferromagnetic rock-salt (Co,Fe)O phase, with an exchange bias magnitude that depended on the ion-beam bombardment conditions. Our results indicate that matching the substrate with appropriate ion-bombardment conditions provides a promising way to engineer selectively two important types of magnetic anisotropy in ferromagnetic/antiferromagnetic bilayers: magneto-crystalline and exchange bias.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )