Spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

By T. Maity, S. Goswami, D. Bhattacharya, G. C. Das, Saibal Roy. 2013

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We have observed a large as well as path-dependent spontaneous exchange bias (HSEB) (∼30–60 mT) in a nanocomposite of BiFeO3-Bi2Fe4O9 across 5–300 K when it is measured in an unmagnetized state following zero-field cooling and appropriate demagnetization. The path dependency yields a variation in the exchange bias depending on the sign of the starting field and the path followed in tracing the hysteresis loop. The asymmetry thus observed—ΔHSEB—is found to be decreasing nonmonotonically across 5–300 K with a peak around 200 K. The ΔHSEB together with large HSEB could have significant ramification in tuning the exchange bias driven effects and consequent applications.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/287b6cb109542496a62c63447ece69cd06f89058