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Interfacial Exchange Coupling and the magnetization of Iron Oxide/Nickel Oxide Superlattices

Published online by Cambridge University Press:  03 September 2012

S. D. Berry ,
D. M. Lind ,
E. Lochner ,
K. A. Shaw ,
D. Hilton ,
R. W. Erwin  and
J. A. Borchers
S. D. Berry
Affiliation:
Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, FL 32306
D. M. Lind
Affiliation:
Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, FL 32306
E. Lochner
Affiliation:
Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, FL 32306
K. A. Shaw
Affiliation:
Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, FL 32306
D. Hilton
Affiliation:
Department of Physics and Center for Materials Research and Technology (MARTECH), Florida State University, Tallahassee, FL 32306
R. W. Erwin
Affiliation:
NIST, Gaithersburg, MD 20899
J. A. Borchers
Affiliation:
NIST, Gaithersburg, MD 20899
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Abstract

The role of interfacial exchange coupling in the magnetic behavior of metal oxide materials has been investigated through the study of Fe3O4/NiO superlattices. We report results on a series of superlattices grown where one bilayer constituent was held to a fixed thickness while varying the other from single unit cell dimensions upward. High crystalline quality was confirmed by XRD, RHEED and neutron diffraction. Magnetization profiles show substantial deviations from bulklike iron oxide results, with an increase in domain rotation energies observed in the superlattices over that of bulk iron oxide (increasing with NiO layer thickness) indicating the strong nature of Fe3O4/NiO interfacial linkage. Neutron scattering at elevated temperatures shows that the NiO remains ordered above the 523 K bulk Néel temperature. This suggests that at least a portion of the NiO within a layer remains ordered well above the Néel temperature, with an increase in effective Néel transition temperature that approaches the Fe3O4 Curie temperature in the limit of very thin NiO layers. Although the exchange coupling dominates these effects, strain also plays an important role.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 313: Symposium Q1 – Magnetic Ultrathin Films, Multilayers and Surfaces/Magnetic Interfaces-Physics and Characterizations , 1993 , 779
Copyright
Copyright © Materials Research Society 1993

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References

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