Experimental magnetic phase diagram of a Gd/Fe multilayered ferrimagnet

Abstract

The experimental magnetic phase diagram of a Gd/Fe multilayer with compensation temperature is reported. Aligned and twisted states are shown to occur as predicted by theoretical simulations. The critical field for the aligned-to-twisted state transition is maximum at 4.2 K and goes to a minimum at the compensation temperature.The magnetic susceptibility is largest at the onset of the twisted state, with a maximum at the compensation temperature.The critical field for the aligned-to-twisted state transition increases when the thickness of the layers decreases.

Magnetization depth profile of (Fe/Dy) multilayers

“…The magnetization of the firstdeposited Dy layer is close to that obtained at 300 K, as will be explained by Monte Carlo simulations. For the upper layers, the in-plane magnetization of the Fe layers ð0m B =atÞ can be interpreted by the existence of PMA or by the formation of a twisted phase, as already seen in (Fe/Gd) multilayers [26,27,32,33]. Indeed, at 100 K, amorphous Fe is magnetically ordered [14,[28][29][30].…”

Stability of ferrimagnetic multilayers

“…In [Fe/Cr] N -like multilayers, the intrinsic exchange energy within the F layers is commonly much stronger than the AF interlayer exchange energy. There are also multilayers exhibiting strong interface magnetic coupling, such as Fe/Gd multilayers, which exhibit a rich structure of phase transitions induced either by external field or temperature [12,13]. One key feature of Fe/Gd systems is the existence of twisted states [12,14], in which the spins within the F layers are not equivalent.…”

Magnetism in Ferromagnetic Spin-1/2 Ising Multilayers

“…All calculations were done with the special parameters to describe the Fe/Gd system, where the ferromagnetic layers Fe and Gd are coupled antiferromagnetically. Recent experiments on Fe/Gd multilayers show that the predicted phases really exist [5,6].…”

“…His results are in agreement with those obtained by Liu et al [11] on the (Fe±Si)/Pd multilayered film. On the other hand, there exists a class of magnetic substances that have been extensively studied (mainly: Co/Ru, Co/Cr, Fe/Cr [7], Fe/Cr [8] Fe/Gd [5,6,32,33], Fe/Cr/Fe [25], Fe/Ag [20], etc.) and for many of these materials theoretical models were proposed.…”