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Magnetic Properties of Epitaxial Co-Evaporated Fe:MgO Anti-Granular Films

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5 Author(s)
Rummey, M. ; Dept. of Electron., Univ. of York, York, UK ; Fleet, L.R. ; Hing, H. ; Zhang, X.
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MR effects in epitaxial Fe:MgO anti-granular systems, which consist of MgO nanoparticles in an Fe matrix, have been studied at room temperature. Fe and MgO were co-evaporated on MgO(001) substrate in the ratio of Fe:MgO = 4:1, 3:1, and 2:1. The samples were annealed for up to 5 h inducing a uniaxial anisotropy. The saturation magnetization of the samples was found to be up to 20% greater than the value for bulk Fe. This is induced by a moment enhancement at the Fe/MgO interfaces. The corresponding magnetoresistance shows strong isotropic behavior with anisotropic components up to ±0.09% for a magnetic field applied along the hard axis. Very strong uniaxial anisotropy is observed with a hysteresis loop squareness of up to 0.97 for the annealed samples.

Published in:

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

Date of Publication:

Nov. 2012

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