Mossbauer studies of R(FeCo)₂Laves phases

Abstract

Magnetic hyperfine field and isomer shift measurements in Y(Fe1-xCox)2 and Ho(Fe1-xCox)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 57Fe hyperfine fields and the proportionality between field and magnetic moment are discussed using a simple model. The Mossbauer spectra of the Y(Fe1-xCox)2 compounds show that the direction of magnetization changes from a (111) axis (in YFe2) to (101) in the samples with x>or=0.17.