Magnetic Remanence in Cu(Mn) Alloys

Abstract

An experimental investigation of the saturated magnetic remanence in dilute Cu(Mn) alloys ranging from 0.47 to 10.0 at.% Mn has been carried out in the temperature range 0.6\ifmmode^\circ\else\textdegree\fi{} to 40\ifmmode^\circ\else\textdegree\fi{}K. At low temperatures the remanence has a temperature dependence resembling that of a paramagnetic material in a constant magnetic field ${\mathrm{H}}_{0}$. Domain sizes derived from the estimated remanence at 0\ifmmode^\circ\else\textdegree\fi{}K are larger than expected from the assumption that domain boundaries coincide with nearest neighbor Mn pairs. At higher temperatures the effective magnetic field ${H}_{T}$ is defined on the basis of the deviation of the remanence from the constant-field curve. For the smaller concentrations the temperature dependence of $\frac{{H}_{T}}{{H}_{0}}$ appears intermediate between ${[1\ensuremath{-}{(\frac{T}{{T}_{c}})}^{2}]}^{\frac{1}{2}}$ and [$1\ensuremath{-}{(\frac{T}{{T}_{c}})}^{2}$]. The ratio $\frac{{H}_{0}}{{T}_{c}}$ is approximately the same for all concentrations.