Correlation of Low-Temperature Caloric and Magnetic Effects in TiFe

Abstract

Magnetic measurements by Nevitt on TiFe can be interpreted on the assumption that his specimen is superparamagnetic. It is possible to calculate from his measurements approximate values of the size and number of ferromagnetic clusters. The magnetization vector of these clusters oscillates at very low temperatures within directions given by the energy of crystal anisotropy. This gives rise to the term C_cl in the specific heat at low temperatures, due to the clusters, which is to be added to the lattice and electronic terms. The calculation gives reasonable agreement of C_cl with experimental values found in specific heat measurements.