Oscillatory exchange coupling and positive magnetoresistance in epitaxial oxide heterostructures

Physical Review Letters

Volumn 85, Issue 17, 2000, Pages 3728-3731

  Nikolaev, K R ^a   Dobin, A Yu ^a   Krivorotov, I N ^a   Cooley, W K ^a   Bhattacharya, A ^a   Kobrinskii, A L ^a   Glazman, L I ^a   Wentzovitch, R M ^a   Dan Dahlberg, E ^a   Goldman, A M ^a  

^a University of Minnesota   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC FORCE MICROSCOPY; BAND STRUCTURE; ELECTRON SCATTERING; EPITAXIAL GROWTH; FERROMAGNETIC MATERIALS; HETEROJUNCTIONS; ION EXCHANGE; MAGNETIC FIELD EFFECTS; MAGNETORESISTANCE; MATHEMATICAL MODELS; SUPERLATTICES;

EPITAXIAL OXIDE HETEROSTRUCTURES; LANTHANUM NICKEL OXIDES; OSCILLATORY EXCHANGE COUPLING;

OXIDE SUPERCONDUCTORS;

EID: 0034297444     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.85.3728     Document Type: Article

References (40)

1. M. N. Baibich et al., Phys. Rev. Lett. 61, 2472 (1988).
2. S.S. P. Parkin, N. More, and K. P. Roche, Phys. Rev. Lett. 64, 2304 (1990).
3. For review articles, see S. S. P. Parkin, IBM J. Res. Dev. 42, 3 (1998).
4. M. D. Stiles, Phys. Rev. B 48, 7238 (1993).
5. P. Bruno, Phys. Rev. B 52, 411 (1995).
6. P. Bruno and C. Chappert, Phys. Rev. B 46, 261 (1992).
7. M. D. Stiles, J. Magn. Magn. Mater. 200, 322 (1999).
8. 4/TiN compound superlattices. Although antiferromagnetic coupling between ferrimagnetic semiconducting magnetite layers was well documented, the evidence for oscillatory behavior was indirect.
9. For a review, see A. P. Ramirez, J. Phys. Condens. Matter 9, 8171 (1997).
10. P.-G. deGennes, Phys. Rev. 118, 141 (1960).
11. D. J. Singh and W. E. Pickett, Phys. Rev. B 57, 88 (1998).
12. R. J. Soulen, Jr. et al., Science 282, 85 (1998).
13. M. L. Medarde, J. Phys. Condens. Matter 9, 1678 (1997).
14. K. Sreedhar et al., Phys. Rev. B 46, 6382 (1992).
15. M. Izumi et al., Phys. Rev. B 60, 1211 (1999); G. Q. Gong et al., ibid. 54, R3742 (1996).
16. M. Izumi et al., Phys. Rev. B 60, 1211 (1999); G. Q. Gong et al., ibid. 54, R3742 (1996).
17. K. R. Nikolaev et al., Appl. Phys. Lett. 75, 118 (1999).
18. J.-P. Locquet et al., Appl. Phys. Lett. 64, 372 (1994).
19. V. S. Achutharaman et al., Thin Solid Films 216, 14 (1992).
20. The in-plane lattice constant of 3.905 Å is set by the substrate. Out-of-plane lattice constants for manganite and nickelate films are 3.94 and 3.81 Å, respectively.
21. For a review, see S.O. Demokritov, J. Phys. D 31, 925 (1998).
22. j are in-plane orientation angles of the magnetizations. Numerical minimization of this energy leads to a model curve for fitting to the data. However, coupling constants cannot be determined unambiguously from a fit when they are small compared to the magnetocrystalline anisotropy, or when the biquadratic coupling constant is smaller than the ferromagnetic bilinear one.
23. B. Dieny et al., Phys. Rev. B 43, 1297 (1991).
24. K. R. Nikolaev et al., Appl. Phys. Lett. 76, 478 (2000).
25. Fabrication of a wedge would be desirable, but the need to maintain uniform substrate temperature and ozone flux during growth makes this approach not possible.
26. 3(001) substrate.
27. N. Troullier and J. L. Martins, Phys. Rev. B 43, 1993 (1991).
28. J. P Perdew, K. Burke, and M. Ernzerhof, Phys. Rev. Lett. 77, 3865 (1996).
29. J. L. Garcia-Munoz et al., Phys. Rev. B 46, 4414 (1992).
30. I. Solovyev, N. Hamada, and K. Terakura, Phys. Rev. B 53, 7158 (1996).
31. P.M. Levy, S. Maekawa, and P. Bruno, Phys. Rev. B 58, 5588 (1998).
32. 3 exhibits enhancement of both its electronic magnetic susceptibility and specific heat [14]. An analysis of this effect in our structures is complicated due to the necessity of considering the crossover from the ballistic [33] to the diffusive [34] regime. There is no independent evidence to suggest that strong electron-electron interactions significantly modify the interlayer coupling in our structures. The RKKY interaction with damping produces an acceptable description of the coupling variation within the accuracy of the data.
33. Z. Celinski et al., Phys. Rev. Lett. 65, 1156 (1990).
34. Y. Takahashi, Phys. Rev. B 56, 8175 (1997).
35. B. L. Al'tshuler and A. G. Aronov, JETP Lett. 38, 153 (1983).
36. M. Izumi et al., Appl. Phys. Lett. 73, 2497 (1998); C. Kwon et al., J. Appl. Phys. 81, 4950 (1997).
37. M. Izumi et al., Appl. Phys. Lett. 73, 2497 (1998); C. Kwon et al., J. Appl. Phys. 81, 4950 (1997).
38. J. M. George et al., Phys. Rev. Lett. 72, 408 (1994); J.-P. Renard et al., Phys. Rev B 51, 12821 (1995).
39. J. M. George et al., Phys. Rev. Lett. 72, 408 (1994); J.-P. Renard et al., Phys. Rev B 51, 12821 (1995).
40. I. N. Krivorotov, K. R. Nikolaev, E. Dan Dahlberg, and A. M. Goldman (to be published) demonstrate the effect of direct exchange field on the transport in exchange-biased manganites.