Please use this identifier to cite or link to this item:
https://doi.org/10.1098/rsta.2012.0198
DC Field | Value | |
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dc.title | Cationic-vacancy-induced room-temperature ferromagnetism in transparent, conducting anatase Ti 1-xTa xO 2 (x ∼0.05) thin films | |
dc.contributor.author | Rusydi, A. | |
dc.contributor.author | Dhar, S. | |
dc.contributor.author | Roy Barman, A. | |
dc.contributor.author | Ariando | |
dc.contributor.author | Qi, D.-C. | |
dc.contributor.author | Motapothula, M. | |
dc.contributor.author | Yi, J.B. | |
dc.contributor.author | Santoso, I. | |
dc.contributor.author | Feng, Y.P. | |
dc.contributor.author | Yang, K. | |
dc.contributor.author | Dai, Y. | |
dc.contributor.author | Yakovlev, N.L. | |
dc.contributor.author | Ding, J. | |
dc.contributor.author | Wee, A.T.S. | |
dc.contributor.author | Neuber, G. | |
dc.contributor.author | Breese, M.B.H. | |
dc.contributor.author | Ruebhausen, M. | |
dc.contributor.author | Hilgenkamp, H. | |
dc.contributor.author | Venkatesan, T. | |
dc.date.accessioned | 2014-10-07T04:52:35Z | |
dc.date.available | 2014-10-07T04:52:35Z | |
dc.date.issued | 2012-10-28 | |
dc.identifier.citation | Rusydi, A., Dhar, S., Roy Barman, A., Ariando, Qi, D.-C., Motapothula, M., Yi, J.B., Santoso, I., Feng, Y.P., Yang, K., Dai, Y., Yakovlev, N.L., Ding, J., Wee, A.T.S., Neuber, G., Breese, M.B.H., Ruebhausen, M., Hilgenkamp, H., Venkatesan, T. (2012-10-28). Cationic-vacancy-induced room-temperature ferromagnetism in transparent, conducting anatase Ti 1-xTa xO 2 (x ∼0.05) thin films. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370 (1977) : 4927-4943. ScholarBank@NUS Repository. https://doi.org/10.1098/rsta.2012.0198 | |
dc.identifier.issn | 1364503X | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/84430 | |
dc.description.abstract | We report room-temperature ferromagnetism (FM) in highly conducting, transparent anatase Ti 1-xTaxO 2 (x ∼0.05) thin films grown by pulsed laser deposition on LaAlO 3 substrates. Rutherford backscattering spectrometry (RBS), X-ray diffraction, protoninduced X-ray emission, X-ray absorption spectroscopy (XAS) and time-of-flight secondary-ion mass spectrometry indicated negligible magnetic contaminants in the films. The presence of FM with concomitant large carrier densities was determined by a combination of superconducting quantum interference device magnetometry, electrical transport measurements, soft X-ray magnetic circular dichroism (SXMCD), XAS and optical magnetic circular dichroism, and was supported by first-principles calculations. SXMCD and XAS measurements revealed a 90 per cent contribution to FM from the Ti ions, and a 10 per cent contribution from the O ions. RBS/channelling measurements show complete Ta substitution in the Ti sites, though carrier activation was only 50 per cent at 5 per cent Ta concentration, implying compensation by cationic defects. The role of the Ti vacancy (V Ti) and Ti 3+ was studied via XAS and X-ray photoemission spectroscopy, respectively. It was found that, in films with strong FM, the V Ti signal was strong while the Ti 3+ signal was absent. We propose (in the absence of any obvious exchange mechanisms) that the localized magnetic moments, V Ti sites, are ferromagnetically ordered by itinerant carriers. Cationic-defect-induced magnetism is an alternative route to FM in wide-band-gap semiconducting oxides without any magnetic elements. © 2012 The Royal Society. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1098/rsta.2012.0198 | |
dc.source | Scopus | |
dc.type | Review | |
dc.contributor.department | PHYSICS | |
dc.contributor.department | ELECTRICAL & COMPUTER ENGINEERING | |
dc.contributor.department | MATERIALS SCIENCE AND ENGINEERING | |
dc.contributor.department | NUS NANOSCIENCE & NANOTECH INITIATIVE | |
dc.description.doi | 10.1098/rsta.2012.0198 | |
dc.description.sourcetitle | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | |
dc.description.volume | 370 | |
dc.description.issue | 1977 | |
dc.description.page | 4927-4943 | |
dc.identifier.isiut | 000309263000007 | |
Appears in Collections: | Staff Publications |
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