Defect-mediated ferromagnetism in insulating Co-doped anatase TiO2 thin films

Physical Review B - Condensed Matter and Materials Physics

Volumn 78, Issue 1, 2008, Pages

  Griffin Roberts, K ^a   Varela, M ^b   Rashkeev, S ^b,c,d   Pantelides, S T ^b,c   Pennycook, S J ^b,c   Krishnan, Kannan M ^a  

^a University of Washington   (United States)

^b OAK RIDGE NATIONAL LABORATORY   (United States)

^c VANDERBILT UNIVERSITY   (United States)

^d IDAHO NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 47349084676     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.014409     Document Type: Article

References (43)

1. Y. Matsumoto, M. Murakami, T. Shono, T. Hasegawa, T. Fukumora, M. Kawasaki, P. Ahmet, T. Chikyow, S. Koshihara, and H. Koinuma, Science SCIEAS 0036-8075 10.1126/science.1056186 291, 854 (2001).
2. S. A. Wolf, D. D. Awschalom, R. Buhrman, J. M. Daughton, S. von Molnar, M. L. Roukes, A. Y. Chtchelkanova, and D. M. Treger, Science SCIEAS 0036-8075 10.1126/science.1065389 294, 1488 (2001).
3. H. Ohno, Science SCIEAS 0036-8075 10.1126/science.281.5379.951 281, 951 (1998).
4. T. Dietl, H. Ohno, F. Matsukura, J. Cibert, and D. Ferrand, Science SCIEAS 0036-8075 10.1126/science.287.5455.1019 287, 1019 (2000).
5. S. J. Pearton, C. R. Abernathy, M. E. Overberg, G. T. Thaler, D. P. Norton, N. Theodoropolou, A. F. Hebard, Y. D. Park, F. Ren, J. Kim, and L. A. Boatner, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.1517164 93, 1 (2003).
6. T. Fukumura, Zhengwu Jin, A. Ohtomo, H. Koinuma, and M. Kawasaki, Appl. Phys. Lett. APPLAB 0003-6951 10.1063/1.125353 75, 3366 (1999).
7. S. A. Chambers, S. Thevuthasan, R. F. C. Farrow, R. F. Marks, J. U. Thiele, L. Folks, M. G. Samant, A. J. Kellock, N. Ruzycki, D. L. Ederer, and U. Diebold, Appl. Phys. Lett. APPLAB 0003-6951 10.1063/1.1420434 79, 3467 (2001).
8. T. Dietl, Nat. Mater. NMAACR 1476-1122 10.1038/nmat989 2, 646 (2003).
9. J. B. Goodenough, Magnetism and the Chemical Bond (Interscience, New York, 1963).
10. J. M. D. Coey, M. Venkatesan, and C. B. Fitzgerald, Nat. Mater. NMAACR 1476-1122 10.1038/nmat1310 4, 173 (2005).
11. K. A. Griffin, A. B. Pakhomov, C. M. Wang, S. M. Heald, and Kannan M. Krishnan, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.94.157204 94, 157204 (2005).
12. T. Zhao, S. R. Shinde, S. B. Ogale, H. Zheng, T. Venkatesan, R. Ramesh, and S. Das Sarma, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.94. 126601 94, 126601 (2005).
13. T. Droubay, S. M. Heald, V. Shutthanandan, S. Thevuthasan, S. A. Chambers, and J. Osterwalder, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.1846158 97, 046103 (2005).
14. S. D. Yoon, Y. Chen, A. Yang, T. L. Goodrich, X. Zuo, K. Ziemer, C. Vittoria, and V. G. Harris, J. Magn. Magn. Mater. JMMMDC 0304-8853 10.1016/j.jmmm.2006.05.014 309, 171 (2007).
15. P. V. Radovanovic and D. R. Gamelin, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.91.157202 91, 157202 (2003)
16. K. R. Kittilstved, N. S. Norberg, and D. R. Gamelin, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.94.147209 94, 147209 (2005).
17. J. D. Bryan, S. A. Santangelo, S. C. Keveren, and D. R. Gamelin, J. Am. Chem. Soc. JACSAT 0002-7863 10.1021/ja0543447 127, 15568 (2005)
18. P. I. Archer, P. V. Radovanovic, S. M. Heald, and D. R. Gamelin, J. Am. Chem. Soc. JACSAT 0002-7863 10.1021/ja054205p 127, 14479 (2005).
19. T. C. Kaspar, S. M. Heald, C. M. Wang, J. D. Bryan, T. Droubay, V. Shutthanandan, S. Thevuthasan, D. E. McCready, A. J. Kellock, D. R. Gamelin, and S. A. Chambers, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.95.217203 95, 217203 (2005).
20. K. A. Griffin, A. B. Pakhomov, C. M. Wang, S. M. Heald, and Kannan M. Krishnan, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.1853311 97, 10D320 (2005).
21. K. A. Griffin, M. Varela, S. J. Pennycook, A. B. Pakhomov, and K. M. Krishnan, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.2170068 99, 08M114 (2006).
22. I. S. Elfimov, S. Yunoki, and G. A. Sawatzky, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.89.216403 89, 216403 (2002).
23. C. Das Pemmaraju and S. Sanvito, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.94.217205 94, 217205 (2005).
24. K. Kikoin and V. Fleurov, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.74.174407 74, 174407 (2006).
25. J. M. D. Coey, Solid State Sci. SSSCFJ 1293-2558 10.1016/j. solidstatesciences.2004.11.012 7, 660 (2005).
26. M. S. Park, S. K. Kwon, and B. I. Min, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.65.161201 65, 161201 (R) (2002).
27. H. Weng, X. Yang, J. Dong, H. Mizuseki, M. Kawasaki, and Y. Kawazoe, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.69.125219 69, 125219 (2004).
28. J. M. Sullivan and S. C. Erwin, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.67.144415 67, 144415 (2003).
29. J. E. Jaffe, T. C. Droubay, and S. A. Chambers, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.1868056 97, 073908 (2005).
30. M. Varela, S. D. Findlay, A. R. Lupini, H. M. Christen, A. Y. Borisevich, N. Dellby, O. L. Krivanek, P. D. Nellist, M. P. Oxley, L. J. Allen, and S. J. Pennycook, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004).
31. N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) NATUAS 0028-0836 10.1038/366143a0 366, 143 (1993).
32. B. Rafferty and S. J. Pennycook, Ultramicroscopy ULTRD6 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999).
33. L. J. Allen, S. D. Findlay, A. R. Lupini, M. P. Oxley, and S. J. Pennycook, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.91.105503 91, 105503 (2003).
34. Y. Ito, R. F. Klie, N. D. Browning, and T. J. Mazanec, J. Am. Ceram. Soc. 85, 969 (2002). 0002-7820
35. M. C. Payne, M. P. Teter, D. C. Allan, T. A. Arias, and J. D. Joannopoulos, Rev. Mod. Phys. RMPHAT 0034-6861 10.1103/RevModPhys.64.1045 64, 1045 (1992).
36. G. Kresse and J. Hafner, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.48.13115 48, 13115 (1993)
37. G. Kresse and J. Furthmüller, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.54.11169 54, 11169 (1996).
38. C. G. Van de Walle, D. B. Laks, G. F. Neumark, and S. T. Pantelides, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.47.9425 47, 9425 (1993).
39. M. Kim, G. Duscher, N. D. Browning, K. Sohlberg, S. T. Pantelides, and S. J. Pennycook, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.86.4056 86, 4056 (2001).
40. M. Abbate, F. M. F. de Groot, J. C. Fuggle, A. Fujimori, Y. Tokura, Y. Fujishima, O. Strebel, M. Domke, G. Kaindl, J. van Elp, B. T. Thole, G. A. Sawatzky, M. Sacchi, and N. Tsuda, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.44.5419 44, 5419 (1991).
41. H. Kurata, E. Lefevre, C. Colliex, and R. Brydson, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.47.13763 47, 13763 (1993).
42. R. Brydson, H. Sauer, W. Engel, J. M. Thomas, E. Zeitler, N. Kosugi, and H. Kuroda, J. Phys.: Condens. Matter JCOMEL 0953-8984 10.1088/0953-8984/1/4/012 1, 797 (1989).
43. Current experimental limitations preclude us from establishing whether the defect complex is charged or what the exact stoichiometry of the defect complex would be. For charge neutrality, the interstitial Co of +2 charge and the VO of +2 charge would require an effective charge compensation of -4. This could be achieved by the presence, on average, of 4 Ti+3 ions, each of which has a -1 charge with respect to the lattice.