Temperature dependence of internal field at the Fe57 nucleus in nickel lattice

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  • Temperature Dependence of Internal Field at the Fe<SUP>57</SUP> Nucleus in Nickel Lattice

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The hyperfine field at the Fe57 nucleus introduced as an impurity in the nickel lattice has been measured at various temperatures, using the Mössbauer resonance technique. The values follow closely but not exactly the saturation magnetization curve of nickel. No internal field is observed above the Curie temperature of nickel.<BR>The results indicate that the hyperfine field at the impurity nucleus is dependent on the impurity and host magnetic moments in a complex way. The above measurements are compared with the NMR measurements of the temperature variation of the hyperfine field at the Co59 and Ni61 nuclei in nickel. The nonoverlap of these variations are explained qualitatively.

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