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

TL;DR

This paper demonstrates how to determine the magnon effective mass in a neodymium magnet by analyzing its temperature-dependent spontaneous magnetization, providing a simple educational method for linking quantum magnon spectra to measurable magnetic properties.

Contribution

It introduces an accessible experimental approach to estimate magnon mass using common laboratory tools and detailed data processing instructions.

Findings

Magnon effective mass can be derived from temperature-dependent magnetization data.

The method is suitable for educational settings and requires minimal specialized equipment.

The paper clarifies the relation between quantum magnon spectra and magnetic field measurements.

Abstract

The effective mass of a magnon in a neodymium magnet is evaluated using Bloch temperature dependence of spontaneous magnetization. We used the Hall effect magnetometer and thermo-couple thermometer for measuring 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.