Magnetic properties of Co-doped TiO2 anatase nanopowders

Pereira, L. C. J.; Nunes, M. R.; Monteiro, O. C.; Silvestre, A. J.
December 2008
Applied Physics Letters;12/1/2008, Vol. 93 Issue 22, p222502
Academic Journal
This letter reports on the magnetic properties of Ti1-xCoxO2 anatase phase nanopowders with different Co contents. It is shown that oxygen vacancies play an important role in promoting long-range ferromagnetic order in the material studied in addition to the transition-metal doping. Furthermore, the results allow ruling out the premise of a strict connection between Co clustering and the ferromagnetism observed in the Co:TiO2 anatase system.


Related Articles

  • Epitaxial growth and properties of ferromagnetic co-doped TiO[sub 2] anatase. Chambers, S. A.; Thevuthasan, S.; Farrow, R. F. C.; Marks, R. F.; Thiele, J. U.; Folks, L.; Samant, M. G.; Kellock, A. J.; Ruzycki, N.; Ederer, D. L.; Diebold, U. // Applied Physics Letters;11/19/2001, Vol. 79 Issue 21, p3467 

    We have used oxygen-plasma-assisted molecular-beam epitaxy (OPA-MBE) to grow Co[sub x]Ti[sub 1-x]O[sub 2] anatase on SrTiO[sub 3](001) for x=∼0.01–0.10, and have measured the structural, compositional, and magnetic properties of the resulting films. Whether epitaxial or...

  • Study of defect-induced ferromagnetism in hydrogenated anatase TiO2:Co. Singhal, R. K.; Samariya, Arvind; Kumar, Sudhish; Xing, Y. T.; Jain, D. C.; Dolia, S. N.; Deshpande, U. P.; Shripathi, T.; Saitovitch, Elisa B. // Journal of Applied Physics;Jun2010, Vol. 107 Issue 11, p113916 

    Electronic and magnetic properties of Co-doped TiO2 polycrystalline pellets (Ti0.95Co0.05O2) have been investigated using x-ray diffraction, x-ray photoemission, magnetization, and resistance measurements. The as-synthesized and hydrogenated specimens crystallize in the anatase type tetragonal...

  • Magnetic and thermal properties of IrMn/FeTaN films. Byeon, S. C.; Rantschler, J.; Alexander, C. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p5867 

    The antiferromagnetic–ferromagnetic exchange coupling between IrMn and FeTaN films has been investigated to study the effects of the exchange field on the high frequency response and the thermal stability of the anisotropy field of FeTaN. Ferromagnetic resonance, vibrating sample...

  • Soft magnetic properties of [FeTaN/N-rich FeTaN][sub n] multilayer films. Kim, Choong-sik; Shin, Dong-hoon; Jeong, Jong-han; Ahn, Dong-hoon; Nam, Seoung-eui; Kim, Hyoung-june // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p5861 

    We investigated the soft magnetic properties of FeTaN multilayers which consist of Fe[sub 78.8]Ta[sub 8.5]N[sub 12.7] films with a periodic insertion of thin (∼100 Å) N-rich FeTaN layers. The FeTaN multilayer leads to an enhancement of magnetic anisotropy compared to the single layer....

  • Time dependent effects and transport evidence for phase separation in La[sub 0.5]Ca[sub 0.5]MnO[sub 3]. Roy, M.; Mitchell, J. F.; Schiffer, P. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p5831 

    The ground state of La[sub 1-x]Ca[sub x]MnO[sub 3] changes from a ferromagnetic metallic to an antiferromagnetic charge-ordered state as a function of Ca concentration at x∼0.50. We present evidence from transport measurements on a sample with x=0.50 that the two phases can coexist, in...

  • Temporal evolution of spin-polarization in ferromagnetic tunnel junctions. Monsma, D. J.; Parkin, S. S. P. // Applied Physics Letters;8/7/2000, Vol. 77 Issue 6 

    The spin polarization of the simple transition-metal ferromagnets Fe, Co, and Ni can be measured using ferromagnet/insulator/superconductor tunneling structures. Measurements, carried out over the past 20 years using superconducting aluminum electrodes and alumina tunneling barriers, have given...

  • Magnetism in transition-metal-doped ZnO: A first-principles study. Gu, Gangxu; Xiang, Gang; Luo, Jia; Ren, Hongtao; Lan, Mu; He, Duanwei; Zhang, Xi // Journal of Applied Physics;7/15/2012, Vol. 112 Issue 2, p023913 

    The magnetic properties and clustering behaviors of the transition-metal (TM)-doped ZnO have been studied by first-principles calculations. We demonstrate the relationship between the types of TM (Co, Fe, Ni, and Cu) pairs and the energetic most stable configurations in ZnO:TM. Further...

  • Absence of ferromagnetism in Fe-doped TiO2 nanoparticles. Balcells, Ll.; Frontera, C.; Sandiumenge, F.; Roig, A.; Martínez, B.; Kouam, J.; Monty, C. // Applied Physics Letters;9/18/2006, Vol. 89 Issue 12, p122501 

    The structural and magnetic properties of Ti1-xFexO2-[variant_greek_epsilon] (x≈0.13) nanoparticles prepared by vaporization-condensation method are analyzed. Samples, mainly of rutile phase, exhibit a pronounced mosaic structure and are free of secondary phases or impurities. Mössbauer...

  • Oxygen vacancies and ferromagnetism in CoxTi1-xO2-x-y. Jaffe, John E.; Droubay, Timothy C.; Chambers, Scott A. // Journal of Applied Physics;4/1/2005, Vol. 97 Issue 7, p073908 

    Cobalt-doped titanium dioxide, or CTO, has emerged in the past 2 years as a semiconducting, transparent, room-temperature ferromagnet. Very recently it has been shown that the magnetism in CTO often originates in surface nanoparticles or Co-rich regions that have a much-enhanced substitutional...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics