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VOLUME 59 (1994) | ISSUE 1 | PAGE 50
Spin excitations and new orientational transition in a holmium orthoferrite with magnetic vacancies: HoFe1-xAlxO3
Dynamic properties of holmium orthoferrite are strongly influenced by low concentrations of nonmagnetic Al3+ dopant ions (magnetic vacancies). Anomalies are observed on the temperature dependence of two antiferromagnetic-resonance modes in the submillimeter spectra of HoFei _XA1X03. These anomalies (a discontinuity and slope changes in the frequencies) point to a spin-flip transition at Τ= 60 К from a weakly ferromagnetic Г4 state to an antiferromagnetic Г] state, induced by magnetic vacancies. A model is offered to explain the observations. The exchange field of the magnetic vacancies is determined.