Electron Spin Resonance Probed Magnetic Interactions in Fe-, Cr-, and Ni-Doped TiO2

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Title:	Electron Spin Resonance Probed Magnetic Interactions in Fe-, Cr-, and Ni-Doped TiO2
Authors:	Chiang, Wen-Chung Lan, Wen-Lin Tang, Yung-Hsiu Lin, J.G.
Contributors:	物理學系
Keywords:	Dilute magnetic semiconductor (DMS) electron spin resonance (ESR) nanoparticles titanium dioxide
Date:	2014-01
Issue Date:	2015-01-28 10:35:07 (UTC+8)
Abstract:	A series of Fe-, Cr-, and Ni-doped TiO2 nanoparticles with doping concentration ranging from 2% to 10% are prepared by the sol-gel method for the study of their structural and magnetic properties. X-ray diffraction and energy dispersive x-ray analysis reveal that the particles are of a single anatase phase with successful substitution of Ti+4 with the dopant ions except Ni, which has a low solubility. Electron spin resonance (ESR) is performed with temperature variation to probe the magnetic interactions. For Fe-and Cr-doped nanoparticles, a similar temperature dependence of signal intensity is observed, indicating the same coupling mechanism. The major paramagnetic resonance signal at g similar to 2 suggests a dipolar interaction associated with the doping-induced free spins in the nanoparticle system whose strength increases with the concentration. This work demonstrates that ESR is a sensitive probe for distinguishing the type of spin interaction in dilute magnetic semiconductors.
Relation:	IEEE TRANSACTIONS ON MAGNETICS 卷: 50 期: 1 子輯: 1 文獻號碼: 1000804
Appears in Collections:	[Department of Physics ] journal articles

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