Atomic-scale studies of cobalt distribution in Co-TiO 2 anatase thin films: Processing, microstructure, and the origin of ferromagnetism

Journal of Applied Physics

Volumn 99, Issue 8, 2006, Pages

  Griffin, K A ^a   Varela, M ^b   Pennycook, S J ^b   Pakhomov, A B ^a   Krishnan, Kannan M ^a  

^a University of Washington   (United States)

^b OAK RIDGE NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

FERROMAGNETIC ORDERING; POSTGROWTH VACUUM ANNEALING PROCESS; SCANNING TRANSMISSION ELECTRON MICROSCOPY;

COBALT ALLOYS; ELECTRON ENERGY LOSS SPECTROSCOPY; FERROMAGNETIC MATERIALS; GRAIN BOUNDARIES; MAGNETIC PROPERTIES; MICROSTRUCTURE;

THIN FILMS;

EID: 33646726496     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.2170068     Document Type: Article

References (25)

1. S. A. Wolf, Science 294, 1488 (2001).
2. H. Ohno, Science 281, 951 (1998).
3. T. Dietl, H. Ohno, F. Matsukura, J. Cibert, and D. Ferrand, Science 287, 1019 (2000).
4. Y. Matsumoto, Science 291, 854 (2001).
5. S. J. Pearton, J. Appl. Phys. 93, 1 (2003).
6. T. Fukumura, Z. Jin, A. Ohtomo, H. Koinuma, and M. Kawasaki, Appl. Phys. Lett. 75, 3366 (1999).
7. S. A. Chambers, Appl. Phys. Lett. 79, 3467 (2001).
8. T. Dietl, Nat. Mater. 2, 646 (2003).
9. K. A. Griffin, A. B. Pakhomov, C. M. Wang, S. M. Heald, and K. M. Krishnan, Phys. Rev. Lett. 94, 157204 (2005).
10. T. Droubay, J. Appl. Phys. 97, 046103 (2005).
11. T. Zhao, Phys. Rev. Lett. 94, 126601 (2005).
12. K. A. Griffin, J. Appl. Phys. 97, 10D320 (2005).
13. J. M. D. Coey, A. P. Douvalis, C. B. Fitzgerald, and M. Venkatesan, Appl. Phys. Lett. 0003-6951 10.1063/1.1650041 84, 1332 (2004); J. M. D. Coey, M. Venkatesan, and C. B. Fitzgerald, Nat. Mater. 4, 173 (2005).
14. J. M. D. Coey, A. P. Douvalis, C. B. Fitzgerald, and M. Venkatesan, Appl. Phys. Lett. 0003-6951 10.1063/1.1650041 84, 1332 (2004); J. M. D. Coey, M. Venkatesan, and C. B. Fitzgerald, Nat. Mater. 4, 173 (2005).
15. S. A. Chambers, Appl. Phys. Lett. 82, 1257 (2003).
16. B. E. Warren, X-ray Diffraction (Dover, New York, 1990).
17. M. Varela, Phys. Rev. Lett. 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004); N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) 0028-0836 10.1038/366143a0 366, 143 (1993); G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Status Solidi A 0031-8965 10.1002/(SICI)1521- 396X(199803)166:1<327::AID-PSSA327>3.0.CO;2-R 166, 327 (1998); U. Kaiser, Nat. Mater. 1476-1122 10.1038/nmat729 1, 102 (2002); B. Rafferty and S. J. Pennycook, Ultramicroscopy 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999); L. J. Allen, Phys. Rev. Lett. 91, 105503 (2003).
18. M. Varela, Phys. Rev. Lett. 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004); N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) 0028-0836 10.1038/366143a0 366, 143 (1993); G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Status Solidi A 0031-8965 10.1002/(SICI)1521- 396X(199803)166:1<327::AID-PSSA327>3.0.CO;2-R 166, 327 (1998); U. Kaiser, Nat. Mater. 1476-1122 10.1038/nmat729 1, 102 (2002); B. Rafferty and S. J. Pennycook, Ultramicroscopy 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999); L. J. Allen, Phys. Rev. Lett. 91, 105503 (2003).
19. M. Varela, Phys. Rev. Lett. 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004); N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) 0028-0836 10.1038/366143a0 366, 143 (1993); G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Status Solidi A 0031-8965 10.1002/(SICI)1521- 396X(199803)166:1<327::AID-PSSA327>3.0.CO;2-R 166, 327 (1998); U. Kaiser, Nat. Mater. 1476-1122 10.1038/nmat729 1, 102 (2002); B. Rafferty and S. J. Pennycook, Ultramicroscopy 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999); L. J. Allen, Phys. Rev. Lett. 91, 105503 (2003).
20. M. Varela, Phys. Rev. Lett. 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004); N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) 0028-0836 10.1038/366143a0 366, 143 (1993); G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Status Solidi A 0031-8965 10.1002/(SICI)1521- 396X(199803)166:1<327::AID-PSSA327>3.0.CO;2-R 166, 327 (1998); U. Kaiser, Nat. Mater. 1476-1122 10.1038/nmat729 1, 102 (2002); B. Rafferty and S. J. Pennycook, Ultramicroscopy 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999); L. J. Allen, Phys. Rev. Lett. 91, 105503 (2003).
21. M. Varela, Phys. Rev. Lett. 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004); N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) 0028-0836 10.1038/366143a0 366, 143 (1993); G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Status Solidi A 0031-8965 10.1002/(SICI)1521- 396X(199803)166:1<327::AID-PSSA327>3.0.CO;2-R 166, 327 (1998); U. Kaiser, Nat. Mater. 1476-1122 10.1038/nmat729 1, 102 (2002); B. Rafferty and S. J. Pennycook, Ultramicroscopy 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999); L. J. Allen, Phys. Rev. Lett. 91, 105503 (2003).
22. M. Varela, Phys. Rev. Lett. 0031-9007 10.1103/PhysRevLett.92.095502 92, 095502 (2004); N. D. Browning, M. F. Chisholm, and S. J. Pennycook, Nature (London) 0028-0836 10.1038/366143a0 366, 143 (1993); G. Duscher, N. D. Browning, and S. J. Pennycook, Phys. Status Solidi A 0031-8965 10.1002/(SICI)1521- 396X(199803)166:1<327::AID-PSSA327>3.0.CO;2-R 166, 327 (1998); U. Kaiser, Nat. Mater. 1476-1122 10.1038/nmat729 1, 102 (2002); B. Rafferty and S. J. Pennycook, Ultramicroscopy 0304-3991 10.1016/S0304-3991(99)00033-9 78, 141 (1999); L. J. Allen, Phys. Rev. Lett. 91, 105503 (2003).
23. K. A. Griffin, M. Varela, S. J. Pennycook, and K. M. Krishnan, unpublished ELNES data.
24. The correlation of interfacial defects to FM activation has previously been demonstrated in transition-metal-doped oxide nanocrystals, see P. V. Radovanovic and D. R. Gamelin, Phys. Rev. Lett. 91, 157202 (2003);
25. J. D. Bryan, S. M. Heald, S. A. Chambers, and D. R. Gamelin, J. Am. Chem. Soc. 126, 11640 (2004).