NMR studies on magnetic properties of intermetallic compounds ${\mathrm{Er}}_{1-x}{\mathrm{Y}}_x{\mathrm{Co}}_3$

Abstract

Field dependence of ⁵⁹Co NMR in ferrimagnetic ${\mathrm{Er}}_{1-x}{\mathrm{Y}}_x{\mathrm{Co}}_3$ was measured up to 8 T at 4.2 K using aligned powdered samples. For pure ${\mathrm{ErCo}}_3$ in fields perpendicular to the c axis the resonance frequencies change discontinuously between 2 and 3 T due to a field induced metamagnetic transition. The easy axis is found to be along the c axis for $x=0$ and 0.1. An average angle for the Co moments of $45\pm 5^{\circ }$ from the c axis is obtained from field dependence of ⁵⁹Co NMR at $x=0.3$. Directions of Co moments are also found to be inclined from the c axis for $x=0.5$.