Nuclear Magnetic Resonance Studies in the Ferromagnetic Compound MnAlGe

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A study of the zero-field nuclear magnetic resonance of Mn⁵⁵ and Al²⁷ in the ferromagnetic compound MnAlGe has been made. The hyperfine fields of Mn⁵⁵ and Al²⁷ nuclei extrapolated to 0 K are 177.4 kOe and 52.6 kOe respectively.
Within the limits of non-interacting spin wave approximation, the intralayer and inter-layer exchange constants, J₁ and J₂, respectively, are estimated from the temperature dependence of the resonance frequency of Mn⁵⁵ nuclei. The results are J₁=163±3 K and J₂=17±1 K, respectively. The difference in the temperature dependence of the normalized NMR frequency between Mn⁵⁵ and Al²⁷ nuclei has been observed.