A sensitive temperature modulation technique for studies in magnetism

A temperature modulation technique has been developed for magnetic measurements in solids. The paper outlines the basic principles of the method and the construction of apparatus for measurements of metals. Measurements of the temperature derivative of the magnetisation of the weak itinerant ferromagnet Ni3Al are reported. The field dependence of the temperature derivative of the magnetisation shows that the collapse of the magnetisation in Ni3Al with increasing temperature can be attributed to spin fluctuations.