NiO-thickness dependent magnetic anisotropies in Fe/NiO/Au(001) and Fe/NiO/MgO(001) systems |
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| Authors: | LY MaG Chen J LiJ Zhu ZQ QiuYZ Wu |
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| Institution: | a Department of Physics, State Key Laboratory of Surface Physics and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China
b Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA |
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| Abstract: | The in-plane magnetic anisotropy of Fe/NiO bilayers was studied quantitatively as a function of NiO thickness using the magneto-optical Kerr effect with a rotating field. For NiO thicker than the ordering transition thickness, the total in-plane fourfold anisotropy of the Fe layer decreases with NiO thickness in Fe/NiO/Au(001), but increases in Fe/NiO/MgO(001). Our result indicates that the exchange coupling in an Fe/NiO bilayer might induce an additional in-plane fourfold anisotropy, and the opposite thickness dependent behaviors may be attributed to the different Ni2+ antiferromagnetic spin orientations for NiO films grown on Au(001) and MgO(001) surfaces. |
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| Keywords: | Exchange coupling Magnetic anisotropy Magnetic layered film Magneto-optic Kerr effect |
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