Monte Carlo investigation of the magnetic anisotropy in Fe/Dy multilayers

Abstract

a b s t r a c tBy Monte Carlo simulations in the canonical ensemble, we have studied the magnetic anisotropy in Fe/Dy amorphous multilayers. This work has been motivated by experimental results which show a clear correlation between the magnetic perpendicular anisotropy and the substrate temperature during elaboration of the samples. Our aim is to relate macroscopic magnetic properties of the multilayers to their structure, more precisely their concentration profile. Our model is based on concentration dependent exchange interactions and spin values, on random magnetic anisotropy and on the existence of locally ordered clusters that leads to a perpendicular magnetisation. Our results evidence that a compensation point occurs in the case of an abrupt concentration profile. Moreover, an increase of the non-collinearity of the atomic moments has been evidenced when the Dy anisotropy constant value grows. We have also shown the existence of inhomogeneous magnetisation profiles along the samples which are related to the concentration profiles.

Magnetization reversal in amorphous Fe/Dy multilayers: A Monte Carlo study

“…IV). This can be explained as following: as previously mentioned [24] the sperimagnetism due to RMA is more pronounced for the abrupt profile, so the increase of B C when adding RMA is larger than for the APT profile.…”

“…This faster decrease is related to the decrease of the magnetization which is also faster than for the APT profile [24].…”