Abstract
A study on magnetic properties of Ho(Fe1−xNix)11.3Nb0.7 has been performed. X-ray diffraction shows that all compounds crystallize in the ThMn12-type structure. Substitution of Ni for Fe leads to a slight decrease of the lattice constants. The Curie temperature clearly increases with increasing Ni content, whereas the saturation magnetization decreases monotonely. The X-ray diffraction patterns of aligned samples show that the easy magnetization direction is along the c-axis for all compounds investigated. A first-order magnetization process (FOMP) has been observed at low temperature in HoFe11.3Nb0.7. The critical field of the FOMP increases with decreasing temperature.
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