Erase/restorable asymmetric magnetization reversal in polycrystalline ferromagnetic films
Li, S. P.
Asymmetric hysteresis loops are generally found in exchange-coupled ferromagnetic/antiferromagnetic layers or composite. Once the film is deposited the magnetization reversal behaviour becomes certain due to the fixed anisotropy of the film. We report an asymmetric magnetization reversal, which is erase/restorable in polycrystalline soft magnetic film. When the film is pre-saturated at a high field in the induced uniaxial easy direction, the asymmetric hysteresis loops with one branch governed by "coherent rotation" and another branch with kink induced by mixed reversal mechanism of "coherent rotation" and "rotation/180 degrees-domain-wall-motion/rotation" are obtained. If the film is presaturated in the induced hard axis, the kink disappears and "normal" hysteresis behaviour is observed instead. Such asymmetric magnetization curve can be restored if the film is pre-saturated in the easy axis again. The observed phenomenon is originated from an embedded second magnetically hard phase which tunes the anisotropy in the film. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765652]
Magnetic hysteresis , Magnetic films , Magnetic anisotropy , Magnetization reversals , Thin films
Li, S. P., Kulkarni, S. and Roy, S. (2012) 'Erase/restorable asymmetric magnetization reversal in polycrystalline ferromagnetic films', Journal of Applied Physics, 112(10), 103918 (5pp). doi: 10.1063/1.4765652
© 2012, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Li, S. P., Kulkarni, S. and Roy, S. (2012) 'Erase/restorable asymmetric magnetization reversal in polycrystalline ferromagnetic films', Journal of Applied Physics, 112(10), 103918 (5pp). doi: 10.1063/1.4765652 and may be found at http://aip.scitation.org/doi/10.1063/1.4765652