Electron spin resonance and antiferromagnetic resonance of single crystals of yttrium doped with gadolinium

Abstract

The s-f interaction between the localized Gd moments and the conduction electrons in yttrium leads to an exchange narrowing of the fine structure due to the hexagonal crystalline field. The axial spin Hamiltonian parameter D, derived from the angular variation of the center of gravity of the observed resonance line, equals--140 Gauss.The s-f interaction and additional indirect exchange interaction between the localized moments narrow the line to almost the homogeneous limit.In the ordered state an antiferromagnetic resonance was observed. The angular dependence of this resonance field can be described by the higher frequency mode of an antiferromagnet with an easy plane.