Abstract
The susceptibility and magnetization of YIG of high purity have been measured from 4.2 to 650\ifmmode^\circ\else\textdegree\fi{}K by means of a precision vacuum balance. The spontaneous magnetization has a saturation value of 37.90 emu/g at 4.2\ifmmode^\circ\else\textdegree\fi{}K and 27.40 emu/g at 292\ifmmode^\circ\else\textdegree\fi{}K. The Curie point is at 559\ifmmode^\circ\else\textdegree\fi{}K as determined by both the vanishing of the spontaneous moment and the discontinuity in the susceptibility curve. Using a program written for the IBM 7090, the molecular field coefficients were determined by fitting the experimental total magnetization curve. The sublattice magnetizations and the exchange interactions are calculated and compared with other results. On the basis of the molecular field model the intrasublattice interactions must be larger than previously supposed.
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