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Angular dependence of magnetization reversal process in patterned Co thin films

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2 Author(s)
Liu, Z.Y. ; Dept. of Phys. & Astron., Nebraska Univ., Lincoln, NE, USA ; Adenwalla, S.

We measured longitudinal and transverse magnetooptic Kerr effect loops to understand the angular dependence of magnetization reversal in an array of 5 μm × 25 μm rectangular thin Co bars with uniaxial anisotropy. When the magnetic field is applied close to the hard axis, the reversal is dominated by coherent rotation; when the field is applied close to the easy axis, the reversal is caused by domain-wall unpinning and the coercive fields observe the relation Hc = H0/cos θ0. For the other orientations, the magnetization first rotates smoothly at larger fields and then switches irreversibly by domain-wall unpinning.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 4 )