Abstract
Diluted magnetic semiconductors Ti1–xMxO2 (M = V, Cr, Mn, Fe, Ni and Cu) with x = 0.005 have been studied in a single crystal form. We have succeeded in growing Ti0.995M0.005O2 single crystals for M = V, Cr, Mn and Ni with the Rutile crystal structure by floating zone method, while it was not successful for M = Fe and Cu. It is found that the physical properties of these single crystals are greatly influenced by growth atmospheres. Among these crystals grown in a low oxygen partial pressure, Ti0.995M0.005O2 with M = Ni exhibited a typical ferromagnetic behavior even at room temperature. Crystallographic properties as well as magnetism have been studied. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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