期刊
THIN SOLID FILMS
卷 484, 期 1-2, 页码 289-298出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2005.02.028
关键词
magnetic properties and measurements; molecular beam epitaxy; chromium; titanium dioxide
As part of a search for new spintronic materials, highly ordered films of CrxTi1-xO2 in both the rutile and anatase structures and for several Cr concentrations ranging from x=0.02 to 0.16 were grown by oxygen plasma assisted molecular beam epitaxy. X-ray photoelectron diffiraction data of the Cr 2p level exhibit the same patterns and the same modulation amplitudes as those observed for Ti 2p, providing a strong indication that a large fraction of the Cr atoms occupy substitutional lattice sites in both structures. The Cr 2p core-level spectra as well as a Cr 3d related dopant signal above the valence band of TiO2 are characteristic of Cr3+ ions. At room temperature, Cr-doped anatase films exhibit ferromagnetic order with a saturation magnetization of similar to 0.6 mu B per Cr atom and strong in-plane anisotropy. (c) 2005 Elsevier B.V. All rights reserved.
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