Antiferromagnetism of γ-FeMn Alloys. II. : Neutron Diffraction and Mossbauer Effect Studies

概要

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The antiferromagnetism of disordered γ-FeMn alloys has been studied by neutron diffraction and Mossbauer effect. The average magnetic moment per atom at 0°K decreases with decreasing Fe concentration from 1.94_<μB> for 69.1 at% Fe to 1.08_<μB> for 47 at% Fe. The hyperfine field at 0°K acting on the Fe nucleus, however, remains almost constant at about 40kOe±3kOe for this concentration range. The temperature dependence of the sublattice moment for 69.1 at% Fe fits with the Brillouin function B_J(x) with J = I. The decrease of the moment near the Neel temperature becomes steeper when the concentration of Fe is lower. In contrast with it, the temperature dependence of the hyperfine field is independent of concentration, and is markedly different from the temperature dependence of the sublattice moment for any concentration. The results indicate that the magnetic moments on Fe and Mn atoms behave with temperature in fairly different ways in this alloy system. The magnetic form factor of γ-FeMn alloys was also determined.
社団法人日本物理学会の論文
1967-08-05