Power law analysis for temperature dependence of magnetocrystalline anisotropy constants of Nd${}_2$Fe${}_{14}$B magnets

Abstract

Phenomenological analysis for the temperature dependence of the magnetocrystalline anisotropy (MA) in rare earth magnets is presented. We define phenomenological power laws applicable to compound magnets using the Zener theory, apply these laws to the magnetocrystalline anisotropy constants (MACs) of Nd${}_2$Fe${}_{14}$B magnets. The results indicate that the MACs obey the power law well, and a general understanding for the temperature-dependent MA in rare earth magnets is obtained through the analysis. Furthermore, to examine the validity of the power law, we discuss the temperature dependence of the MACs in Dy${}_2$Fe${}_{14}$B and Y${}_2$Fe${}_{14}$B magnets as examples wherein it is difficult to interpret the MA using the power law.

5pages, 6 figures

References in corpus (3)

• Quantum Theory of Rare-Earth Magnets
• Monte Carlo analysis for finite temperature magnetism of Nd${}_2$Fe${}_{14}$B permanent magnet
• Theoretical evaluation on the temperature dependence of magnetic anisotropy constants of Nd2Fe14B - Effects of exchange field and crystal field strength -

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