Evidence of intrinsic magnetism in capped ZnO nanoparticles
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2010
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American Physical Society
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Abstract
We present here direct experimental evidence of the magnetic polarization of Zn atoms in ZnO nanoparticles capped with different materials by means of x-ray magnetic circular dichroism (XMCD). Our results demonstrate that the magnetism in this material is intrinsic and relays in the ZnO conduction band. The analysis of both x-ray absorption spectroscopy and XMCD signals points out the formation of a well-defined interface between ZnO and the capping molecule in which the exotic magnetism arises at the hybridized band formed among Zn and the bonding atom of the molecule. The magnetic properties of these systems should critically depend on the details of this interface which may offer a new insight into the different observations for seemingly identical materials.
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©2010 The American Physical Society.
This work was partially supported by Spanish CICYT under Grants No. MAT2008-06542-C04-01, No. MAT2008-06517-C02-01, No. CSD2009-00013, and No. FIS-2008- 06249, and by the EU project “BONSAI” Grant No. LSHBCT-2006-037639. The synchrotron radiation experiments were performed at SPring-8 Proposals No. 2008B1773 and No. 2009B0024 and APS Proposal No. GUP-10283. We acknowledge to N. Kawamura, M. Suzuki, and M. Mizumaki, and to J. Freeland for their assistance during the SR experiments at SPring-8 and APS, respectively. R.B. acknowledges the Ministerio de Eduación y Ciencia of Spain for a PhD. Grant. M.A.L. acknowledges the Ministerio de Ciencia e Innovación of Spain for a Juan de la Cierva grant.
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