Magnetism and structure of anatase (Ti 1-xV x)O 2 films

D. Le Roy; S. Valloppilly; R. Skomski; S. H. Liou; D. J. Sellmyer

doi:10.1063/1.3679434

Magnetism and structure of anatase (Ti _1-xV _x)O ₂ films

D. Le Roy, S. Valloppilly, R. Skomski, S. H. Liou, D. J. Sellmyer

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Anatase TiO ₂ is known as a promising host material for a wide-gap ferromagnetic semiconductor as it is a good solvent for numerous transition-metal elements. We report on the structural and magnetic properties of epitaxially grown anatase (Ti _1-xV _x)O ₂ layers where x covers the whole range of solubility of V atoms in anatase TiO ₂ and beyond the solubility limit of 21. We measured an average magnetic moment per vanadium as high as 1 μ _B with a magnetic percolation threshold of less than 6 which agrees with recent theoretical predictions. Interestingly, our results show a decrease of the average V magnetic moment as x increases throughout the solubility range. Anatase (Ti _1-xV _x)O ₂ is no longer present beyond the solubility limit, where the nonmagnetic VO ₂ phase forms and destroys the net magnetization.

Original language	English (US)
Article number	07C118
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3679434
State	Published - Apr 1 2012

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Magnetism and structure of anatase (Ti 1-xV x)O 2 films",

abstract = "Anatase TiO 2 is known as a promising host material for a wide-gap ferromagnetic semiconductor as it is a good solvent for numerous transition-metal elements. We report on the structural and magnetic properties of epitaxially grown anatase (Ti 1-xV x)O 2 layers where x covers the whole range of solubility of V atoms in anatase TiO 2 and beyond the solubility limit of 21. We measured an average magnetic moment per vanadium as high as 1 μ B with a magnetic percolation threshold of less than 6 which agrees with recent theoretical predictions. Interestingly, our results show a decrease of the average V magnetic moment as x increases throughout the solubility range. Anatase (Ti 1-xV x)O 2 is no longer present beyond the solubility limit, where the nonmagnetic VO 2 phase forms and destroys the net magnetization.",

author = "{Le Roy}, D. and S. Valloppilly and R. Skomski and Liou, {S. H.} and Sellmyer, {D. J.}",

note = "Funding Information: This work is supported by the U.S. Army Research Office under Award No. W911 NF-09- 20039 (D.LR, D.J.S, S.V.), the National Science Foundation Materials Science and Engineering Center under Award No. DMR-0820521 (R.S., S.H.L.), and the Nebraska Center for Materials and Nanoscience (Central Facility support). ",

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AU - Valloppilly, S.

AU - Skomski, R.

AU - Liou, S. H.

AU - Sellmyer, D. J.

N1 - Funding Information: This work is supported by the U.S. Army Research Office under Award No. W911 NF-09- 20039 (D.LR, D.J.S, S.V.), the National Science Foundation Materials Science and Engineering Center under Award No. DMR-0820521 (R.S., S.H.L.), and the Nebraska Center for Materials and Nanoscience (Central Facility support).

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AB - Anatase TiO 2 is known as a promising host material for a wide-gap ferromagnetic semiconductor as it is a good solvent for numerous transition-metal elements. We report on the structural and magnetic properties of epitaxially grown anatase (Ti 1-xV x)O 2 layers where x covers the whole range of solubility of V atoms in anatase TiO 2 and beyond the solubility limit of 21. We measured an average magnetic moment per vanadium as high as 1 μ B with a magnetic percolation threshold of less than 6 which agrees with recent theoretical predictions. Interestingly, our results show a decrease of the average V magnetic moment as x increases throughout the solubility range. Anatase (Ti 1-xV x)O 2 is no longer present beyond the solubility limit, where the nonmagnetic VO 2 phase forms and destroys the net magnetization.

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