Power law analysis for temperature dependence of magnetocrystalline anisotropy constants of Nd2Fe14B magnets

Abstract

We perform phenomenological analysis of the temperature dependence of magnetocrystalline anisotropy (MA) in rare-earth magnets. We define the phenomenological power laws applicable to compound magnets using the Zener theory, and we apply these laws to study the magnetocrystalline anisotropy constants (MACs) of Nd2Fe14B magnets. The results indicate that the MACs closely obey the power law, and further, our analysis yields a better understanding of the temperature-dependent MA in rare-earth magnets. Furthermore, to examine the validity of the power law, we discuss the temperature dependence of the MACs in Dy2Fe14B and Y2Fe14B magnets as examples of cases wherein it is difficult to interpret the MA using the power law.