H-T Phase Diagram of Rare-Earth -- Transition Metal Alloy in the Vicinity of the Compensation Point

Abstract

Anomalous hysteresis loops of ferrimagnetic amorphous alloys in high magnetic field and in the vicinity of the compensation temperature have so far been explained by sample inhomogeneities. We obtain H-T magnetic phase diagram for ferrimagnetic GdFeCo alloy using a two-sublattice model in the paramagnetic rare-earth ion approximation and taking into account rare-earth (Gd) magnetic anisotropy. It is shown that if the magnetic anisotropy of the $f$-sublattice is larger than that of the $d$-sublattice, the tricritical point can be at higher temperature than the compensation point. The obtained phase diagram explains the observed anomalous hysteresis loops as a result of high-field magnetic phase transition, the order of which changes with temperature. It also implies that in the vicinity of the magnetic compensation point the shape of magnetic hysteresis loop is strongly temperature dependent.

arXiv comment8 pages, 3 figures

References in corpus (4)

• Spintronics: Fundamentals and applications
• Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating
• Athermal All-Optical Femtosecond Magnetization Reversal in GdFeCo
• All-thermal switching of amorphous Gd-Fe alloys: analysis of structural properties and magnetization dynamics

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• Domain wall dynamics of ferrimagnets induced by spin-current near the angular momentum compensation temperature
• Magnetic moment orientation and in depth distribution of dysprosium near the surface of DyCo${}_{4.6}$ thin films determined by the analysis of their X ray circularly polarized absorption Dy $M_5$ spectra
• Diversity of Ultrafast Spin Dynamics Near the Tricritical Point in a Ferrimagnetic Gd/FeCo Multilayer
• Magnetic resonance frequency of two-sublattice ferrimagnet with magnetic compensation temperature
• Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point