Magnetization depth profile of (Fe/Dy) multilayers

Abstract

International audienc

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

“…These results evidence that the magnetisation profile along the multilayer is not homogeneous, which has already been observed experimentally on these samples from polarised neutrons reflectivity measurements [9]. We would like to emphasise that unlike what is mentioned in several papers [21][22][23], our results indicate that the atomic moment distribution around the mean magnetisation direction in each plane is not uniform but rather Gaussian for the two concentration profiles.…”

“…This study has been performed by taking into account recent experimental results of the structural and of the magnetic properties of amorphous Fe/Dy multilayers [7][8][9]. In particular, hysteresis loops measured with the magnetic field applied successively in the film plane and perpendicular to it show that the perpendicular magnetic anisotropy is stronger for the multilayers deposited at a higher temperature (600 K compared to 320 K) [8].…”

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

“…J Fe−Dy is strongly negative; it is thus responsible for the ferrimagnetic order (with Fe moments antiparallel to Dy moments) which has been experimentally observed by polarized neutron reflectivity measurements [10].…”

“…In the last decades, compositionally modulated films have been extensively investigated because of their interesting magnetic properties and potential applications in magnetooptical recording. In particular, transition metal (TM) / rare earth (RE) amorphous multilayers, such as Fe/Dy multilayers, have been studied because of to their particular magnetic properties [1,2,3,4,5,6,7,8,9,10]. In some conditions, they may exhibit a large magnetic anisotropy perpendicular to the layer, a high Curie temperature and a high coercive field for example.…”

“…Recently, the results of Tamion et al on (Fe 3nm/Dy 2nm) multilayers [9,10] have allowed to correlate the uniaxial anisotropy constant with the elaboration temperature by means of atom probe tomography, SQUID magnetometry and polarized neutron reflectivity measurements. It has been shown that the PMA is maximum for an elaboration temperature T S = 570K, that is for diffuse interfaces.…”