Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

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Abstract

Theoretical model is proposed for calculating the phase H-T diagrams of a rare-earth ferrimagnet, considering the effects of each of the magnetic sublattices and surface anisotropy. Magnetic phase diagrams are numerically calculated. The presence of surface anisotropy leads to blurring of the second-order phase transition lines between the collinear and angular phases, displacement of the tricritical point, as well as the possibility of the formation of new phase transition lines.

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About the authors

V. V. Yurlov

Moscow Institute of Physics and Technology; New Spintronic Technologies LLC

Author for correspondence.
Email: yurlov.vv@phystech.edu
Russian Federation, Dolgoprudny; Moscow

K. A. Zvezdin

Moscow Institute of Physics and Technology; New Spintronic Technologies LLC; Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: yurlov.vv@phystech.edu
Russian Federation, Dolgoprudny; Moscow; Moscow

A. K. Zvezdin

Moscow Institute of Physics and Technology; New Spintronic Technologies LLC; Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: yurlov.vv@phystech.edu
Russian Federation, Dolgoprudny; Moscow; Moscow

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2. Fig. 1. H-T phase diagram of a ferrimagnet in a magnetic field applied along the easy axis in a wide range of fields; solid lines and dashed lines denote the second-order phase transition between the collinear and angular phases and the second-order phase transition between the collinear phases, respectively (a). Enlarged phase diagram near tricritical points P and P'; straight line TMR'P' shows the first-order phase transition between the collinear phases, curves RP and R'P' show the first-order phase transition between the angular and collinear phases (b). Reduced phase diagram near the magnetization compensation temperature TM (c). AC and BE are the lines of loss of stability in the absence of surface anisotropy; A'C' and B'E' are the lines of loss of stability in the presence of surface anisotropy. All diagrams are plotted for .

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3. Fig. 2. H-T phase diagram of a ferrimagnet in a magnetic field directed perpendicular to the easy axis near the magnetization compensation point; solid lines show the second-order phase transition between the collinear and angular phases, dashed lines show the second-order phase transition between the collinear phases; AC and BE are the lines of loss of stability at zero surface anisotropy; A'C' and B'E' are the lines of loss of stability in the presence of surface anisotropy; the diagram is plotted at (a). Magnetic phase diagram near the compensation temperature TM; the diagram is plotted at (b).

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