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Ferromagnetic/antiferromagnetic exchange coupling in SrFe12O19/CoO composites

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Abstract

The surface of SrFe12O19 coated with a CoO layer reveals a strong exchange bias characterized by magnetic hysteresis loops. The low-temperature coercivity, HC, and the squareness, MR/MS, of a permanent magnet of SrFe12O19/CoO powder prepared by the sol–gel method are enhanced after field cooling through the Néel temperature (TN=290 K) when compared to those after zero-field cooling. The existence of loop shifts and the enhancement of HC indicate that exchange-bias effects, which are induced by the ferromagnetic/antiferromagnetic (FM/AFM) exchange-coupling interactions, are responsible for these behaviors. According to our experimental results, some of the factors controlling the exchange bias, such as FM/AFM interfaces and the CoO amount of the antiferromagnetic layer, are discussed.

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Authors and Affiliations

  1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 210093, Nanjing, China

    X.S. Liu, B.X. Gu, W. Zhong, H.Y. Jiang & Y.W. Du

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  1. X.S. Liu
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  2. B.X. Gu
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  3. W. Zhong
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  4. H.Y. Jiang
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  5. Y.W. Du
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Correspondence to X.S. Liu.

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PACS

75.30.Et; 75.50.Ee; 75.60.Ej; 75.60.Gm; 75.70.Cn

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Liu, X., Gu, B., Zhong, W. et al. Ferromagnetic/antiferromagnetic exchange coupling in SrFe12O19/CoO composites. Appl. Phys. A 77, 673–676 (2003). https://doi.org/10.1007/s00339-002-1762-4

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  • DOI: https://doi.org/10.1007/s00339-002-1762-4

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