Magnetic Equation of State for Nickel Near Its Curie Point

The magnetization-field-temperature ($\ensuremath{\sigma}\ensuremath{-}H\ensuremath{-}T$) behavior of nickel both above and below its Curie point ${T}_{c}$ is found to obey an equation of state in which $\frac{\ensuremath{\sigma}}{{|1\ensuremath{-}\frac{T}{{T}_{c}}|}^{\ensuremath{\beta}}}$ is uniquely related to $\frac{H}{{|1\ensuremath{-}\frac{T}{{T}_{c}}|}^{\ensuremath{\beta}+\ensuremath{\gamma}}}$, where $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ are the critical exponents for the temperature dependence of the spontaneous moment and initial susceptibility, respectively.