A phenomenological theory of itinerant weak ferromagnetism

A phenomenological theory is explored for itinerant weak ferromagnetism. Free energy including the higher order terms of m 4 and h m 3 is introduced and examined. This free energy is derived from the mean-field free energy expression with the use of the Bragg–Williams entropy. We apply the present t...

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Bibliographic Details
Published inThe European physical journal. B, Condensed matter physics Vol. 96; no. 1
Main Author Matsumoto, Kazuyuki
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 2023
Springer
Springer Nature B.V
Subjects
Analysis
Complex Systems
Condensed Matter Physics
Ferromagnetic materials
Ferromagnetism
Fluid- and Aerodynamics
Free energy
Hyperbolas
Magnetic fields
Magnetization
Manganese silicide
Physics
Physics and Astronomy
Regular Article - Solid State and Materials
Solid State Physics
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Summary:A phenomenological theory is explored for itinerant weak ferromagnetism. Free energy including the higher order terms of m 4 and h m 3 is introduced and examined. This free energy is derived from the mean-field free energy expression with the use of the Bragg–Williams entropy. We apply the present theory to the typical itinerant weak ferromagnetic materials ZrZn 2 , MnSi 2 , and others. To determine the model parameters, we use the experimental value of the magnetization under the large magnetic field or the extension of the Arrott plot with a functional form of hyperbola. This extended Arrott plot would explain various experimentally observed M – H curves at finite temperatures. Finally, we discuss the Sommerfeld coefficient in magnetic fields based on the present theory.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/s10051-022-00459-x