کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1800517 | 1524894 | 2013 | 4 صفحه PDF | دانلود رایگان |
We report an asymmetry of magnetic disorder in exchange-biased IrMn(tIrMn=5–20 nm)/CoFe(50 nm) films observed by means of a Kerr microscope, capable of direct domain observation. From the correlation between the magnetization half-reversal time and applied magnetic field, we find that the magnetization switching in all the films occurs via a thermally activated reversal mechanism for both branches of hysteresis loops. Surprisingly, in the forward branch reversal where the applied magnetic field is antiparallel to the direction of exchange-bias field, degree of magnetic disorder decreases as exchange-bias field increases, which is definitely contrasted with the case of backward branch reversal. This result is likely ascribed to the fact that the local values of exchange-bias field and coercive field are oppositely fluctuating with each other in the film.
► Quite different “magnetic disorder” in the same structural-disordered system.
► Elucidation of magnetization reversal mechanism via direct domain observation.
► The simple model which explains the origin of asymmetric magnetic disorder.
Journal: Journal of Magnetism and Magnetic Materials - Volume 325, January 2013, Pages 13–16