title: Chemical manipulation of high-T(C) ferromagnetism in ZnO diluted magnetic semiconductors.
abstract: We report the use of targeted p- and n-type chemical perturbations to manipulate high-T(C) ferromagnetism in Mn(2+):ZnO and Co(2+):ZnO in predictable and reproducible ways. We demonstrate a clear correlation between nitrogen and high-T(C) ferromagnetism for Mn(2+):ZnO and an inverse correlation for Co(2+):ZnO, both as predicted by recent theoretical models. These chemical perturbations reveal rich possibilities for exerting external control over high-T(C) spin ordering in diluted magnetic semiconductors.
authors.affiliation: Department of Chemistry and Center for Nanotechnology, University of Washington, Seattle, WA 98195-1700, USA.
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Kittilstved
authors.forename: Nick S
authors.initials: NS
authors.lastname: Norberg
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Gamelin