Determination of effective magnon mass of neodymium magnet by temperature dependence of spontaneous magnetization

The effective mass of a magnon in a neodymium magnet is evaluated using Bloch temperature dependence of spontaneous magnetization. We use the Hall effect magnetometer and thermo-couple thermometer for measurement of the temperature of the water in which the encapsulated commercial magnet is immersed...

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Bibliographic Details
Published in:European journal of physics 2021-07, Vol.42 (4), p.45502
Main Authors: Mishonov, Todor M, Andreoni, Matteo, Mihaylova, Nelly Zh, Varonov, Albert M
Format: Article
Language:English
Subjects:
Bloch law
magnon
magnon mass
Nd magnet
spontaneous magnetization
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Summary:The effective mass of a magnon in a neodymium magnet is evaluated using Bloch temperature dependence of spontaneous magnetization. We use the Hall effect magnetometer and thermo-couple thermometer for measurement of the temperature of the water in which the encapsulated commercial magnet is immersed. The experiment can be repeated in every school and methodological remarks for experimental data processing are given with great detail and attention. The purpose of the paper is to illustrate the simple relation between the quantum spectrum of magnons and the easily measured magnetic field of a permanent magnet.
ISSN:0143-0807
1361-6404
DOI:10.1088/1361-6404/abf6ec