Electron spin resonance investigation of the substitution of Fe3+ for Ti4+ ions in rutile TiO2 single crystal

doi:10.1088/1674-1056/18/8/069

Abstract

Abstract A Fe doped rutile TiO₂ single crystal is grown in an O₂ atmosphere by the floating zone technique. Electron spin resonance (ESR) spectra clearly demonstrate that Fe³⁺ ions are substituted for the Ti⁴⁺ ions in the rutile TiO₂ matrix. Magnetization measurements reveal that the Fe:TiO₂ crystal shows paramagnetic behaviour in a temperature range from 5 K to 350 K. The Fe³⁺ ions possess weak magnetic anisotropy with an easy axis along the c axis. The annealed Fe:TiO₂ crystal shows spin-glass-like behaviours due to the aggregation of the ferromagnetic clusters.

Keywords: rutile electron spin resonance diluted magnetic semiconductors

Received: 14 April 2009
Revised: 20 April 2009
Accepted manuscript online:

PACS:	76.30.Fc	(Iron group (3d) ions and impurities (Ti-Cu))
	75.20.Ck	(Nonmetals)
	75.30.Gw	(Magnetic anisotropy)
	75.50.Pp	(Magnetic semiconductors)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	81.10.Fq	(Growth from melts; zone melting and refining)

Fund: Project supported by the National Basic Research Program of China (Grant No 2009CB929201) and the National Natural Science Foundation of China (Grant No 10774179).

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Li Guo-Ke(李国科), Zhang Xiang-Qun(张向群), Wu Hong-Ye(吴鸿业), Huang Wan-Guo(黄万国), Jin Jin-Ling(靳金玲), Sun Young(孙阳), and Cheng Zhao-Hua(成昭华) Electron spin resonance investigation of the substitution of Fe³⁺ for Ti⁴⁺ ions in rutile TiO₂ single crystal 2009 Chin. Phys. B 18 3551

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Electron spin resonance investigation of the substitution of Fe3+ for Ti4+ ions in rutile TiO2 single crystal

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Electron spin resonance investigation of the substitution of Fe³⁺ for Ti⁴⁺ ions in rutile TiO₂ single crystal