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Epitaxial growth and magnetic exchange anisotropy in Fe3O4/NiO bilayers grown on MgO(001) and Al2O3(0001)

  • Epitaxial systems
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Abstract.

Epitaxial Fe3O4/NiO bilayers were epitaxially grown on MgO(001) and Al2O3(0001) substrates to investigate the influence of the fully spin compensated (001) and the non-compensated (111) NiO interface planes between the ferromagnetic (F) and antiferromagnetic (AF) layers on the AF/F exchange coupling. Bilayers of different magnetite thicknesses and constant NiO thickness were investigated. The structural characterizations indicate a perfect epitaxy of the two layers for the both growth directions in the two Fe3O4/NiO/MgO(001) and NiO/Fe3O4/Al2O3(0001) systems. An epitaxial ferrimagnetic (Ni,Fe)Fe2O4 phase is observed at the AF/F  interface when the NiO oxide is grown on the top of the Fe3O4 layer while a perfectly flat AF/F interface is observed in the Fe3O4/NiO/MgO(001) system exhibiting only a very slight interdiffusion. Magnetic measurements indicate a relative strong bias at 300 K for the bilayers grown on Al2O3(0001), which decreases with the inverse of the ferrimagnetic layer thickness as theoretically expected. On the contrary, a zero exchange biasing is observed at 300 K for the bilayers grown on MgO(001).

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Authors and Affiliations

  1. CEMES-CNRS, 29 rue J. Marvig, BP 94347, 31055, Toulouse Cedex, France

    C. Gatel, E. Snoeck & V. Serin

  2. LNMO, 135 avenue de Rangueil, 31077, Toulouse Cedex 4, France

    A. R. Fert

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  1. C. Gatel
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  2. E. Snoeck
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  3. V. Serin
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  4. A. R. Fert
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Correspondence to E. Snoeck.

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Gatel, C., Snoeck, E., Serin, V. et al. Epitaxial growth and magnetic exchange anisotropy in Fe3O4/NiO bilayers grown on MgO(001) and Al2O3(0001). Eur. Phys. J. B 45, 157–168 (2005). https://doi.org/10.1140/epjb/e2005-00073-y

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