[1] HONG N H, SAKAI J, POIROT N, et al. Room-temperature ferromagnetism observed in undoped semiconducting and insulating oxide thin films[J]. Phys Rev B, 2006, 73:132404. [2] KIM D, HONG J, PARK Y R, et al. The origin of oxygen vacancy induced ferromagnetism in undoped TiO2[J]. J Phys:Condens Matter, 2009, 21:195405. [3] ZHOU S, CI_ZM_AR E, POTZGER K, et al. Origin of magnetic moments in defective TiO2 single crystals[J]. Phys Rev B, 2009, 79:113201. [4] SINGHAL R K, KUMAR S, KUMARI P,et al. Evidence of defect-induced ferromagnetism and its "switch" action in pristine bulk TiO2[J]. Appl Phys Lett, 2011, 98:092510. [5] SANTARA B, GIRI P K, IMAKITA K, et al. Evidence of oxygen vacancy induced room temperature ferromagnetism in solvothermally synthesized undoped TiO2 nanoribbons[J].Nanoscale, 2013, 5:5476-5488. [6] YANG K, DAI Y, HUANG B, et al. Density-functional characterization of antiferromagnetism in oxygen-deficient anatase and rutile TiO2[J]. Phys Rev B, 2010, 81:033202. [7] PENG H W, LI J B, LI S S, et al. Possible origin of ferromagnetism in undoped anatase TiO2[J]. Phys Rev B, 2009, 79:092411. [8] HAN G B, HU S J, YAN S S, et al. Magnetic properties of rutile TiO2-1/6 from first-principles calculations[J]. Phys Status Solidi-Rapid Res Lett, 2009, 4:236-238. [9] ZUO X, YOON S D, YANG A, et al. Ab initio calculation on ferromagnetic reduced anatase TiO2-δ[J]. J Appl Phys, 2008, 103:07B911. [10] WANG G T, ZHANG L, ZHANG H P, et al. Electronic structure and magnetism of BaTi2Bi2O[J]. Chinese J Comput Phys, 2015, 32:107-114. [11] SONG D, NIU Y, XIAO L, et al. First-principles study of structural, electronic, and magnetic properties of Mn-doped ZnS (111) surfaces[J]. Chinese J Comput Phys, 2013, 30:783-790. [12] ANISIMOV V I, ZAANEN J, ANDERSEN O K. Band theory and Mott insulators:Hubbard U instead of Stoner[J]. Phys Rev B, 1991, 44:943. [13] DUDAREV S L, BOTTON G A, SAVRASOV S Y, et al. Electron-energy-loss spectra and the structural stability of nickel oxide:An LSDA+U study[J]. Phys Rev B, 1998, 57:1505. [14] SABINE T M, HOWARD C J. Determination of the oxygen x parameter in rutile by neutron powder methods[J]. Acta Crystallogr B, 1982, 38:701-702. [15] CHO E, HAN S, AHN H S, et al. First-principles study of point defects in rutile TiO2-x[J]. Phys Rev B, 2006, 73:193202. |