Epitaxial growth and magnetic exchange anisotropy in
Fe3O4<Emphasis Type="Bold">/NiO bilayers grown on MgO(001) and
Al</Emphasis>2O3(0001) |
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Authors: | C?Gatel Email author" target="_blank">E?SnoeckEmail author V?Serin A R?Fert |
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Institution: | (1) CEMES-CNRS, 29 rue J. Marvig, BP 94347, 31055 Toulouse Cedex, France;(2) LNMO, 135 avenue de Rangueil, 31077 Toulouse Cedex 4, France |
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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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Keywords: | |
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