Role of Thermal Effects on Magnetic Interactions in Stacked Magnetic Layers With Perpendicular Anisotropy

The role of thermally excited magnetization reversals on magnetic interactions in stacked magnetic layers with perpendicular anisotropy has been investigated by first-order reversal curves (FORC) and coercive squareness (S*). For this purpose, a study of the effect of systematic variation of exchange interaction in granular perpendicular magnetic anisotropy layers on FORC contours has been carried out along with S* and coercivity measurements at various timescales. The results indicate that the FORC contour peak height is a better parameter than S* to study the exchange interactions in systems such as magnetic recording media and is insensitive to thermal effects.