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High throughput characterization of magnetic semiconductor thin films with a scanning SQUID microscope

  • X. J. Fan (a1) (a2), M. Murakami (a1), R. Takahasi (a1), T. Koida (a1), Y. Matsumoto (a1) (a2), T. Hasegawa (a1) (a2), T. Fukumura (a2) (a3), M. Kawasaki (a2) (a3), P. Ahmet (a2), T. Chikyow (a2) and H. Koinuma (a1) (a2)...

Abstract

Magnetic properties of Co-doped rutile (Ti1-xCoxO2) film in combinatorial composition-spread form have been surveyed by means of a Scanning Superconducting-quantum-interference-device Microscope (SSM). As a consequence, we found magnetic domains in the spatial regions with x>0.05 without external field, giving strong evidence for ferromagnetism with finite spontaneous magnetization. The magnetic moment was monotonously increased with increasing doping level x from 0.05 to ∼ 0.13. On the other hand, it was almost unchanged for x > ∼ 0.13, suggesting that Co does not dissolve into rutile film beyond x ∼ 0.13. The SSM results on the rutile Ti0.95Co0.05O2 thin films with different thickness showed that the magnetic moment is proportional to film thickness, leading to a conclusion that the presently observed ferromagnetism does not result from Co or Co-based oxide particles on the film surface.

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1. Matsumoto, Yuji, Murakami, Makoto, Shono, Tomoji, Hasegawa, Tetsuya, Fukumura, Tomoteru, Kawasaki, Maseshi, Ahmet, Parhat, Chikyow, Toyohiro, Koshihara, Shin-ya, Koinuma, Hideomi, Science, 291, 854 (2001).
2. Matsumoto, Y., Fan, Xiao-Juan and Hasegawa, T., Takahashi, R., Koida, T., Murakami, M., Koinuma, H., Fukumura, T., Kawasaki, M., and Koshihara, S., Jpn. J. Appl. Phys., 40, L1204 (2001).
3. Chambers, S. A., Thevuthasan, S., Farrow, R. F. C., Marks, R. F., Thiele, J.-U., Folks, L., Samant, M., Kellock, A. J., Ruzycki, N., Ederer, D. L., and Diebold, U., Appl. Phys. Lett. 79, 3467 (2001).

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