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Spin reorientation phase transitions in RE-Co5 hexagonal ferromagnets

AC initial susceptibility and static low-field and pulsed high-field magnetisation measurements have been performed on a series of PrxNd1-xCo5 compounds. The results clearly show that the spin reorientation transition temperature from easy plane to easy cone and the low-temperature value of the angle theta between the easy magnetisation direction and the c axis both decrease with increasing Pr concentration. A scaling model of the spin reorientation phase transitions observed in the initial AC susceptibility has been used to obtain the critical exponents of the initial susceptibility. The scaling behaviour of the temperature dependence of theta has also been investigated and the measured critical exponent beta is in approximate agreement with a model prediction for systems exhibiting competing axial-planar anisotropies.