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Investigation of Magnetic Order in Iron Oxide-Nickel Oxide Superlattices with Modulation Wavelength Less Than 80 Å

Published online by Cambridge University Press:  26 February 2011

S. D. Berry ,
D. M. Lind ,
G. Chern ,
H. Mathias  and
L. R. Testardi
S. D. Berry
Affiliation:
Florida State University, Department of Physics and the Center for Materials Research and Technology, Tallahassee, FL 32306-3016
D. M. Lind
Affiliation:
Florida State University, Department of Physics and the Center for Materials Research and Technology, Tallahassee, FL 32306-3016
G. Chern
Affiliation:
Florida State University, Department of Physics and the Center for Materials Research and Technology, Tallahassee, FL 32306-3016
H. Mathias
Affiliation:
Florida State University, Department of Physics and the Center for Materials Research and Technology, Tallahassee, FL 32306-3016
L. R. Testardi
Affiliation:
Florida State University, Department of Physics and the Center for Materials Research and Technology, Tallahassee, FL 32306-3016
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Abstract

We have investigated the magnetic order, using SQUID magnetometry, for short modulation wavelength Fe3O4/NiO superlattices, grown on single crystal MgO. Ferrimagnetic Fe3O4 has a saturation moment of ~500 emu/cm3 at 0 K and a Curie temperature of 858 K, while bulk NiO is antiferromagnetic with a NMel temperature of 525 K. Very high crystalline quality with little interdiffusion is indicated by X-ray diffraction, SEM, optical microscopy, and in-situ RHEED, and the samples show highly anisotropic electrical conductivity which also indicates the strong modulation present. Long wavelength samples (Amod > 200 Å) have a behavior only slightly different from that expected from bulk Fe3O4, but for Amod<80 Å, spontaneous magnetization is replaced by paramagnetism, with weak temperature dependence (not I/T) from 5 K to 400 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 231: Symposium S – Magnetic Surfaces, Thin Films and Multilayers , 1991 , 423
Copyright
Copyright © Materials Research Society 1992

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References

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