Ferromagnetism Induced by Clustered Co in Co-Doped Anatase ${\mathrm{T}\mathrm{i}\mathrm{O}}_{2}$ Thin Films

Ferromagnetism Induced by Clustered Co in Co-Doped Anatase ${T i O}_{2}$ Thin Films

J.-Y. Kim, J.-H. Park, B.-G. Park, H.-J. Noh, S.-J. Oh, J. S. Yang, D.-H. Kim, S. D. Bu, T.-W. Noh, H.-J. Lin, H.-H. Hsieh, and C. T. Chen

Phys. Rev. Lett. 90, 017401 – Published 10 January 2003

Abstract

We investigated ferromagnetism of a newly discovered ferromagnetic semiconductor Co-doped anatase ${T i O}_{2}$ thin film, using the magnetic circular dichroism (MCD) at the Co $L_{2, 3}$ absorption edges. The magnetic moment was observed to be $\sim 0.1 μ_{B} / C o$ in the measurements, but the MCD spectral line shape is nearly identical to that of Co metal, showing that the ferromagnetism is induced by a small amount of clustered Co. With thermal treatments at $\sim 400 ° C$ , the MCD signal increases, and the moment reaches up to $\sim 1.55 μ_{B} / C o$ , which is $\sim 90 %$ of the moment in Co metal. In the latter case, the cluster size was observed to be 20–60 nm.

Received 14 April 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.017401

Authors & Affiliations

J.-Y. Kim^1,2, J.-H. Park^1,*, B.-G. Park¹, H.-J. Noh³, S.-J. Oh³, J. S. Yang⁴, D.-H. Kim⁴, S. D. Bu⁴, T.-W. Noh⁴, H.-J. Lin⁵, H.-H. Hsieh⁵, and C. T. Chen⁵

¹Department of Physics & Electron Spin Science Center, Pohang University of Science and Technology, Pohang, Korea
²Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Korea
³School of Physics & Center for Strongly Correlated Materials Research, Seoul National University, Seoul, Korea
⁴School of Physics & Research Center for Oxide Electronics, Seoul National University, Seoul, Korea
⁵Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan

^*Author to whom all correspondence should be addressed. Email address: jhp@postech.ac.kr

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Vol. 90, Iss. 1 — 10 January 2003

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Physical Review Letters

Ferromagnetism Induced by Clustered Co in Co-Doped Anatase TiO2 Thin Films

J.-Y. Kim, J.-H. Park, B.-G. Park, H.-J. Noh, S.-J. Oh, J. S. Yang, D.-H. Kim, S. D. Bu, T.-W. Noh, H.-J. Lin, H.-H. Hsieh, and C. T. Chen

Phys. Rev. Lett. 90, 017401 – Published 10 January 2003

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Ferromagnetism Induced by Clustered Co in Co-Doped Anatase ${T i O}_{2}$ Thin Films