Polarized neutron reflectometry is used to probe the in-plane projection of the net-magnetization vector M⇀ of polycrystalline Fe films exchange coupled to twinned (110) MnF2 or FeF2 antiferromagnetic (AF) layers. The magnetization reversal mechanism depends upon the orientation of the cooling field with respect to the twinned microstructure of the AF, and whether the applied field is increased to (or decreased from) a positive saturating field; i.e., the magnetization reversal is asymmetric. The reversal of the sample magnetization from one saturated state to the other occurs via either domain wall motion or magnetization rotation on opposite sides of the same hysteresis loop. © 2000 The American Physical Society.
|Journal||Physical Review Letters|
|Publication status||Published - 1 Jan 2000|