Abstract
The saturation magnetization, Curie temperature, easy direction of magnetization and anisotropy field of Er 2 Co 17-x M x compounds where M = Fe, Mn or Ni were investigated. It was not possible to prepare single phase materials for x > 6 when M = Mn and for x > 10 when M = Ni. The Mn containing ternaries possess an easy direction of magnetization along the c-axis whereas for Fe containing ternaries the easy direction changes from c-axis to basal plane for x > 10. In the case of Er 2 Co 17-x Ni x the easy direction changes from c-axis to basal plane with nickel substitution and the remains along the basal plane until x = 8 at which concentration the spins prefer the c-axis. At low temperatures Er 2 Fe 11 Co 6 , Er 2 Co 15 Ni 2 , and Er 2 Co 11 Co 6 show a tendency to deviate from the easy plane. The Curie temperature decreases with M substitution and the decrease is rapid when M = Mn. Er 2 Co 15 Mn 2 possess an anisotropy field of 133 kOe at 4.2 K as compared to 31 kOe for Er 2 Co 17 Ni. A model is proposed to explain the easy axis change as a function of M.
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