Unexpected magnetism in a dielectric oxide

M. Venkatesan, C. B. Fitzgerald and J. M. D. Coey ()
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M. Venkatesan: SFI-Trinity Nanoscience Laboratory, Trinity College
C. B. Fitzgerald: SFI-Trinity Nanoscience Laboratory, Trinity College
J. M. D. Coey: SFI-Trinity Nanoscience Laboratory, Trinity College

Nature, 2004, vol. 430, issue 7000, 630-630

Abstract: Abstract It is generally accepted that magnetic order in an insulator requires the cation to have partially filled shells of d or f electrons. Here we show that thin films of hafnium dioxide (HfO2), an insulating oxide better known as a dielectric layer for nanoscale electronic devices, can be ferromagnetic even without doping. This discovery challenges our understanding of magnetism in insulators, because neither Hf4+ nor O2− are magnetic ions and the d and f shells of the Hf4+ ion are either empty or full.

Date: 2004
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DOI: 10.1038/430630a

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