Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 20 - Magnetic Properties - Questions and Problems - Page 835: 20.15

Answer

The saturation magnetization decreases with increasing temperature for ferromagnetic materials because the atomic thermal vibrational motions counteract the coupling forces between the adjacent atomic dipole moments, which causes some magnetic dipole misalignment. Ferromagnetic behavior ceases above the Curie temperature because the atomic thermal vibrations are sufficiently violent that they completely destroy the mutual spin coupling forces.

Work Step by Step

The saturation magnetization decreases with increasing temperature for ferromagnetic materials because the atomic thermal vibrational motions counteract the coupling forces between the adjacent atomic dipole moments, which causes some magnetic dipole misalignment. Ferromagnetic behavior ceases above the Curie temperature because the atomic thermal vibrations are sufficiently violent that they completely destroy the mutual spin coupling forces.
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