ABSTRACT
Weiss and Forrer (1926) showed experimentally that TðI2Þ dependences in ferromagnets are linear in the paraprocess region in accordance with equations (2.42) and (2.50). Extrapolating the linear part of TðI2Þ to the I2 axis, Weiss and Forer (1926) determined a value of spontaneous magnetization I2s at various temperatures. This method was used to determine IsðTÞ dependence in Fe, Ni and Co by Weiss and Forrer (1926),
Potter (1934) and Rocker and Kohlhaas (1967). Belov (1961a,b) observed in Ni in the temperature range from 618 to 627K the linear dependence of H=T1=2 on T predicted by the Landau theory (see equation (2.32b)).
