SCHEDULED MAINTENANCE
Giant exchange bias field above room temperature in perovskite YbCr1−xFexO3 (x = 0.6–0.9)
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Abstract
Temperature-induced exchange bias is observed in perovskite YbCr1−xFexO3 (x = 0.6–0.9) compounds. This is ascribed to the ferromagnetic (FM) coupling between Fe3+/Cr3+ ions and Yb3+ ions. During demagnetization, the Yb3+ ions will show a tendency to rotate with the direction of the applied magnetic field. However, the antiferromagnetic coupling of Fe3+/Cr3+ ions has a pinning effect, hindering their rotation, and thus producing an exchange bias effect. With increasing Fe3+ ion content, the magnetization and exchange bias field gradually become larger. When x = 0.8 and 0.9, the exchange bias field reaches up to −9.7 kOe and −13.6 kOe at 300 K, respectively. This giant room temperature exchange bias field will be more conducive for practical applications in magnetoelectronic devices.
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