Theoretical investigation of temperature induced phase transition in exchange coupled double layers

Abstract

In the present work the mean field theory is used to determine the magnetic properties of a GdCo “planar” layer under exchange interaction with a TbFeCo “perpendicular” layer. The magnetization distributions φ1 and φ2 in the planar and perpendicular layers are determined from a micromagnetic model using a variational method of the magnetic energies in the temperature range 0–500 K. φ2 presents small change with the temperature. On the other hand, φ1 and its mean value 〈φ1〉 are very sensitive to the temperature and the layer composition and thickness. A temperature induced phase transition with a magnetization reorientation from in-plane to a perpendicular direction can be induced in the planar layer in a temperature window ΔT which depends on its compensation temperature TCP1 and its thickness which has to be lower than a critical value.

Magnetization-induced second-harmonic generation of light by exchange-coupled magnetic layers

“…A numerical simulation of ⌽ versus in-depth position z from the Dy 30 Fe 58 Co 12 /glass interface was simulated by the OOMMF software program. 21 The following parameters 22 (Fig. 2).…”

Subsystem domination influence on magnetization reversal in designed magnetic patterns in ferrimagnetic Tb/Co multilayers

“…However, for a quasi-discontinuous composition change, the compensation DW is well localized 19 and insensitive to small temperature changes. For large temperature variations, the ferrimagnetic structure changes from behaving as coexisting regions with distinct subsystem domination to behaving as regions similarly dominated but with different coercive fields 23 . Therefore, in ferrimagnetic films similar changes in magnetic properties can be achieved controlling either composition or temperature 24 .…”