Above Room Temperature Ferromagnetism in Co- and V- Doped TiO2-delta - Revealing the Different Contributions of Defects and Impuritiesстатья
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Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
Аннотация:We report recent experimental results on the magnetic, magnetotransport, and magneto-optical properties of Co- and V-doped TiO2−δ magnetic oxides at the doping level around 1 at. %. The samples were prepared using rf magnetron sputtering in identical conditions that allows to compare the mechanisms of above-room-temperature ferromagnetism observed in both cases of doping. In spite of the comparable values of magnetic moment around 1 ÷ 2.5 µ B per 3d impurity derived from macroscopic magnetic measurements for both systems, the magneto-optical response of TiO2−δ :V was at least 2 orders of magnitude weaker. The anomalous Hall effect was absent in V-doped TiO2−δ , and no appreciable magnetic moment on V impurities was found by X-ray magnetic circular dichroism (XMCD) technique in contrast to Co-doped TiO2−δ . The obtained experimental data indicate dissimilar origin of intrinsic ferromagnetism in TiO2−δ :Co and TiO2−δ :V.