Crystallographic and intrinsic magnetic properties of Nd 1− xDy xFe 10.5Mo 1.5 compounds and their nitrides ( x=0.0−1.0)

Abstract

The variation of the crystallographic and magnetic properties with Dy concentration has been investigated for Nd 1− x Dy x Fe 10.5Mo 1.5 and Nd 1− x Dy x Fe 10.5Mo 1.5N y compounds. In the Nd 1− x Dy x Fe 10.5Mo 1.5 system, the lattice parameters a, c and the saturation magnetization at 1.5 K decrease with increasing Dy concentration, while the Curie temperature changes only little. At room temperature, all Nd 1− x Dy x Fe 10.5Mo 1.5 samples exhibit weak easy-axis anisotropy with anisotropy fields up to about 1 T with a clear increase with increasing Dy concentration. Upon nitrogenation, the Nd 1− x Dy x Fe 10.5Mo 1.5N y compounds retain the original tetragonal ThMn 12-type of structure but the unit-cell volume increases about 3.1%. At room temperature, the Nd 1− x Dy x Fe 10.5Mo 1.5N y compounds show easy-axis anisotropy with anisotropy fields above 7.2 T. At room temperature, in the Nd 1− x Dy x Fe 10.5Mo 1.5N y system the anisotropy field slightly increases with increasing Dy concentration.