Magnetic hyperfine field and isomer shift measurements in Y(Fe 1-x Co x ) 2 and Ho(Fe 1-x Co x ) 2 intermetallic compounds are reported, and the changes in these quantities with concentration are related to changes in the d moment and in the lattice parameter. The origin of the 57 Fe hyperfine fields and the proportionality between field and magnetic moment are discussed using a simple model. The Mossbauer spectra of the Y(Fe 1-x Co x ) 2 compounds show that the direction of magnetization changes from a (111) axis (in YFe 2 ) to (101) in the samples with x>or=0.17.
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Guimarães et al. (1973) studied this question.
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