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Concentration and Defect Dependent Ferromagnetism above Room Temperature in Co Doped ZnO Films Prepared by Metalorganic Decomposition

  • P. Kharel (a1), C. Sudakar (a2), G. Lawes (a3), R. Suryanarayanan (a4), R. Naik (a5) and V. M. Naik (a6)...

Abstract

Zn1−xCoxO (x = 0.0 – 0.047) thin films (thickness ∼0.5 – 1 μm) have been prepared on sapphire substrates using metalorganic decomposition (MOD) method. The X-ray diffraction and Raman scattering studies indicate films to be polycrystalline ZnO with wurtzite structure. The optical absorption spectra show an expected bandgap of ∼3.2 eV. The magnetization studies show that the as prepared films lack the room temperature ferromagnetic order, whereas the films when vacuum annealed at a temperature 500 – 600 °C acquire ferromagnetic ordering at room temperature. Further, the observed ferromagnetism (FM) appears only for a limited range of Co concentration, 0.03 < x < 0.10 (after heat treating in vacuum at 550 °C), and it reversibly disappears upon re-annealing in air. The data presented here seem to suggest that the appearance of ferromagnetic order is dictated by both the oxygen defects and the critical concentration of Co, and thus may lend support to a recent model proposed by Coey et al. [Nature Materials 4, 173 (2005)].

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1. Pearton, S.J., Abernathy, C.R., Overberg, M.E., Thaler, G.T., and Norton, D.P., Theodoropoulou, N., Hebard, A.F., Park, Y.D., Ren, F., Kim, J., and Boatner, L.A., J. Appl. Phys. 93, 1 (2003).10.1063/1.1517164
2. Sato, K. and Yoshida, H. K., Jpn. J. Appl. Phys., Part 2 40, L334 (2001).10.1143/JJAP.40.L334
3. Ohno, H., Shen, A., Matsukura, F., Oiwa, A., Endo, A., Katsumoto, S. and Iye, Y., Appl. Phys. Lett. 69 363 (1996).10.1063/1.118061
4. Dietl, T., Ohno, H., Matsukura, F., Cibert, J., and Ferrand, D., Science 287, 1019 (2000).10.1126/science.287.5455.1019
5. Matsumoto, Y., Murakami, M., Shono, T., Hasegawa, T., Fukumura, T., Kawasaki, M., Ahmet, P., Chikyow, T., Koshihara, S. Y. and Koinuma, H., Science 291, 854 (2001).10.1126/science.1056186
6. Wang, Z., Tang, J., Tung, L., Zhou, W. and Spinu, L., J. Appl. Phys. 93 7870 (2003).10.1063/1.1556122
7. Hong, N.H., Sakai, J. and Prellier, W., J. Magn. Magn. Mater. 281, 347 (2004).10.1016/j.jmmm.2004.04.125
8. Ueda, K., Tabata, H. and Kawai, T., Appl. Phys. Lett. 79 988 (2001).10.1063/1.1384478
9. Fukuma, T., Jin, Z., Kawasaki, M., Shono, T., Hasegawa, T., Koshihara, S. and Koinuma, H. Appl. Phys. Lett. 78, 958 (2001).10.1063/1.1348323
10. Hori, H., Sonada, S., Sasaki, T., Yamamoto, Y., Shimizu, S., Suga, K. and Kindo, K. Physica B 324, 142 (2002).10.1016/S0921-4526(02)01288-7
11. Wu, S.Y., Liu, H.X., Singh, R.K., Budd, L., van Schilfgarde, M., McCarthy, M.R., Smith, D.J. and Newman, N., Appl. Phys. Lett. 82, 3047 (2003).10.1063/1.1570521
12. Ogale, S.B., Choudhary, R.J., Buban, J.P., Lofland, S.E., Shinde, S.R., Kale, S.N., Kulkarni, V.N., Higgins, J., Lanci, C., Simpson, C.J.R., Browning, N.D., Sarma, S.D., Drew, H.D., Greene, R.L. and Venkatesan, T., Phys. Rev. Lett. 91, 077205 (2003).10.1103/PhysRevLett.91.077205
13. Coey, J.M.D., Douvalis, A.P., Fitzerald, C.B. and Venkatesan, M., Appl. Phys. Lett. 84, 1332 (2004).10.1063/1.1650041
14. 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. and Diebold, U. Appl. Phys. Lett. 79, 3467 (2001).10.1063/1.1420434
15. Wan, K.P., Ortega-Hertogs, R.J., Moodera, J., Punnoose, S.A. and Seehra, M.S., J. Appl. Phys. 91, 8093 (2002).
16. Shutthanandan, V., Thevudasan, S., Heald, S. M., Droublay, T., Englehard, M.H., Kasper, T.C., McCready, D.E., Saraf, L., Chambers, S.A., Mun, B.S., Hamdan, N.M., Nachimuthu, P., Taylor, B., Sears, R.P. and Sinkovic, B., Appl. Phys. Lett. 84, 4466 (2004).10.1063/1.1753652
17. Murakami, M., Matsumoto, Y., Hasegawa, T., Ahmet, P., Nakajima, K., Chikyow, T., Ofuchi, H., Nakai, I. and Koinuma, H., J. Appl. Phys. 95, 5330 (2004).10.1063/1.1695598
18. Kane, M.H., Shalini, K., Summers, C.J., Varatharajan, R., Nause, J., Vestal, C.R., Zhang, Z.J., and Ferguson, I. T., J. Appl. Phys. 97, 023906 (2005).10.1063/1.1830084
19. Ando, K., Saito, H., Jin, Z., Fukumura, T., Kawasaki, M., Matsumoto, Y. and Koinuma, H., J. Appl. Phys. 89, 7284 (2001).10.1063/1.1356035
20. Park, J.H., Kim, M.G., Jang, H.M., Ryu, S. and Kim, Y. M., Appl. Phys. Lett. 84, 1338 (2004).10.1063/1.1650915
21. Risbud, A.S., Spaldin, N.A., Chen, Z.Q., Stemmer, S. and Seshadri, R., Phy. Rev. B 68, 205202 (2003).10.1103/PhysRevB.68.205202
22. Koidl, P., Phys. Rev. B 15, 2493 (1977).10.1103/PhysRevB.15.2493
23. Srikant, V. and Clarke, D.R., J. Appl. Phys. 81, 6357 (1997).10.1063/1.364393
24. Bundesmann, C., Ashkenov, N., Schuber, M., Spemann, D., Butz, T., Kaidashev, E. M., Lorents, M. and Grundmann, M., Appl. Phys. Lett. 83, 1974 (2003).10.1063/1.1609251
25. Coey, J.M.D., Venkatesan, M. and Fitzgerald, C.B., Nature Materials 4, 173 (2005).10.1038/nmat1310

Keywords

Concentration and Defect Dependent Ferromagnetism above Room Temperature in Co Doped ZnO Films Prepared by Metalorganic Decomposition

  • P. Kharel (a1), C. Sudakar (a2), G. Lawes (a3), R. Suryanarayanan (a4), R. Naik (a5) and V. M. Naik (a6)...

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