Spin reorientation in tetragonal Er Y Co10Mo2 and ErCo10−Ni Mo2 compounds

Abstract The thermal dependence of the easy magnetisation direction of tetragonal Er 1− x Y x Co 10 Mo 2 and ErCo 10− y Ni y Mo 2 compounds were studied from the angular dependence of the magnetisation vector measured on oriented powders. Whereas one of the studied materials exhibits rather usual first-order transitions at T SR , the other materials present quite complex and unusual spin reorientation which are discussed by considering the different contributions to the anisotropy.