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Inducing Magnetism in Wide Band Gap Hosts

Published online by Cambridge University Press:  01 February 2011

Ram Seshadri ,
Aditi S. Risbud  and
Gavin Lawes
Ram Seshadri
Affiliation:
Materials Department and Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA
Aditi S. Risbud
Affiliation:
Materials Department and Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA
Gavin Lawes
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, MI 48202, USA
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Abstract

We have used precursor routes to prepare magnetic transition metal ion (tM) substituted wurtzite ZnO powders with up to 15% tM substitution (tM = Co and Mn) on the cation site. Careful magnetic studies reveal these samples show no cooperative magnetic ordering, and certainly no ferromagnetism. Instead, the nearest-neighbor coupling is actually antiferromagnetic. Modeling of the temperature dependence of the magnetic susceptibility indicates the difficulty in inducing ferromagnetism, in keeping with the results of density functional calculations. The alternate strategy of inducing dilute ferri magnetism in wide band gap spinel hosts with two cation sites has been more successful; dilute magnets based on tM substitution in spinel ZnGa2O4 seem promising, displaying magnetic hysteresis in nearly transparent samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF4.7
Copyright
Copyright © Materials Research Society 2005

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References

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