caa a22 4500 463211138 CHVBK 20180405153141.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00339-007-3948-2 doi (NATIONALLICENCE)springer-10.1007/s00339-007-3948-2 Growth, electronic and magnetic properties of doped ZnO epitaxial and nanocrystalline films [Elektronische Daten] [S.A. Chambers, D.A. Schwartz, W.K. Liu, K.R. Kittilstved, D.R. Gamelin] We have used oxygen plasma assisted metal organic chemical vapor deposition along with wet chemical synthesis and spin coating to prepare CoxZn1-xO and MnxZn1-xO epitaxial and nanoparticle films. Co(II) and Mn(II) substitute for Zn(II) in the wurtzite lattice in materials synthesized by both methods. Room-temperature ferromagnetism in epitaxial Co:ZnO films can be reversibly activated by diffusing in Zn, which occupies interstitial sites and makes the material n-type. O-capped Co:ZnO nanoparticles, which are paramagnetic as grown, become ferromagnetic upon being spin coated in air at elevated temperature. Likewise, spin-coated N-capped Mn:ZnO nanoparticle films also exhibit room-temperature ferromagnetism. However, the inverse systems, N-capped Co:ZnO and O-capped Mn:ZnO, are entirely paramagnetic when spin coated into films in the same way. Analysis of optical absorption spectra reveals that the resonances Co(I)↔Co(II)+e- CB and Mn(III)↔Mn(II)+h+ VB are energetically favorable, consistent with strong hybridization of Co (Mn) with the conduction (valence) band of ZnO. In contrast, the resonances Mn(I)↔Mn(II)+e- CB and Co(III)↔Co(II)+h+ VB are not energetically favorable. These results strongly suggest that the observed ferromagnetism in Co:ZnO (Mn:ZnO) is mediated by electrons (holes). Springer-Verlag, 2007 Chambers S.A. Fundamental Science Directorate, Pacific Northwest National Laboratory, PO Box 999, MS K8-80, 99352, Richland, WA, USA aut Schwartz D.A. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut Liu W.K. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut Kittilstved K.R. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut Gamelin D.R. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut Applied Physics A Springer-Verlag 88/1(2007-07-01), 1-5 0947-8396 88:1<1 2007 88 339 https://doi.org/10.1007/s00339-007-3948-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3948-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chambers S.A. Fundamental Science Directorate, Pacific Northwest National Laboratory, PO Box 999, MS K8-80, 99352, Richland, WA, USA aut NATIONALLICENCE 700 1- Schwartz D.A. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut NATIONALLICENCE 700 1- Liu W.K. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut NATIONALLICENCE 700 1- Kittilstved K.R. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut NATIONALLICENCE 700 1- Gamelin D.R. Department of Chemistry, University of Washington, PO Box 351700, 98195-1700, Seattle, WA, USA aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/1(2007-07-01), 1-5 0947-8396 88:1<1 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer