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Effect of magnetic vacancies on magnetic properties of terbium orthoferrites
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1984
Year
Magnetic PropertiesEngineeringMagnetic VacanciesMagnetic ResonancePure Tbfeo3Magnetic MaterialsMagnetoresistanceMagnetismMultiferroicsSuperconductivityQuantum MaterialsMaterials ScienceTerbium IonsPhysicsMagnetic MaterialCrystallographyFerromagnetismNatural SciencesApplied PhysicsCondensed Matter PhysicsAnisotropy EnergyMagnetic PropertyMagnetic Field
It is theoretically shown and experimentally found that in the TbFe1−xAlxO3 system the presence of non-magnetic ions Al3+ (magnetic vacancies) results in a considerable increase of anisotropy energy in the ac-plane and suppresses the spontaneous orientational transition Γ42 → Γ2, observed in pure TbFeO3. The character of the orientational transition Γ42 → Γ2 induced by the applied field H along the a-axis is studied. The Hx−T phase diagram contains a tricritical point. A qualitative change of the temperature dependence of magnetization and susceptibility along the c-axis is found in TbFe1−xAlxO3 as compared to TbFeO3. This is explained by the deviation of the Ising axes of Tb3+ ions from the ab-plane of the crystal. It is experimentally shown that the magnetic vacancies suppress the antiferromagnetic ordering of the terbium ions. [Russian Text Ignored].