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    • Keywords


      Nanoparticles; nitride; exchange bias; spin glass.

    • Abstract


      Nanoparticles of 𝜀-Fe2.8Cr0.2N system exhibit the exchange bias phenomenon due to the exchange coupling of the spins of the antiferromagnetic (AF) oxide/oxynitride surface layer and the ferromagnetic (FM) nitride core. Exchange bias is observed at 10 K both in the absence and presence of cooling field. Due to the interface disorder, a mixture of parallel and anti-parallel/perpendicular coupling of the AF and FM spins is observed. The roughness of AF-FM interface induces disorder due to the random exchange anisotropy. The saturation magnetization is also found to be drastically lowered as compared to parent 𝜀-Fe3N. Below 58 K, the broad peak ($T_{E} \cong T_{f}$) in zero-field cooled (ZFC) magnetization curves indicates the presence of unidirectional anisotropy and spin-glass-like ordering, that arises from the freezing of localized frustrated spins.

    • Author Affiliations


      N S Gajbhiye1 Sayan Bhattacharyya1 Sachil Sharma1

      1. Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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