Zero-Bias Anomaly in Magnetic Tunnel Junctions

• Authors: H. Yang , S. Yang , G. Ilnicki , J. Martinek , S. Parkin
• Languages of publication: EN

Abstracts

EN

We present experimental results, which may indicate the possibility of the coexistence of the Kondo effect and ferromagnetism in macroscopic planar magnetic tunnel junctions with a layer of nanodots inside tunnel barriers. A conductance double peak structure was observed. Magnetic field dependence of the splitting of a conductance peak, and temperature evolution of the conductance curves are well explained from the theoretical point of view according to the predictions of the Kondo physics and cotunneling in the Anderson quantum dot coupled to ferromagnetic leads.

Keywords

EN

73.21.La; 73.23.-b; 73.22.-f

Discipline

• 73.22.-f: Electronic structure of nanoscale materials and related systems
• 73.23.-b: Electronic transport in mesoscopic systems
• 73.21.La: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 2
• Pages: 316-318

Dates

published

2010-08

Contributors

author

H. Yang

• Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore

author

S. Yang

• IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA

author

G. Ilnicki

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

J. Martinek

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

S. Parkin

• IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA

References

• 1. A.F.G. Wyatt, Phys. Rev. Lett. 13, 401 (1964)
• 2. D.J. Lythall, A.F.G. Wyatt, Phys. Rev. Lett. 20, 1361 (1968)
• 3. A.C. Hewson, The Kondo Problem to Heavy Fermions, Cambridge Univ. Press, Cambridge 1993
• 4. D. Goldhaber-Gordon, Hadas Shtrikman, D. Mahalu, David Abusch-Magder, U. Meirav, M.A. Kastner, Nature 391, 156 (1998)
• 5. S.M. Cronenwett, T.H. Oosterkamp, L.P. Kouwenhoven, Science 281, 540 (1998)
• 6. J. Nygard, D.H. Cobden, P.E. Lindelof, Nature 408, 342 (2000)
• 7. A.N. Pasupathy, Science 306, 86 (2004)
• 8. J.R. Hauptmann, J. Paaske, P.E. Lindelof, Nature Phys. 4, 373 (2008)
• 9. K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, K. Hirakawa, T. Machida, T. Taniyama, S. Ishida, Y. Arakawa, Appl. Phys. Lett. 91, 232105 (2007)
• 10. M.R. Calvo, J. Fernández-Rossier, J.J. Palacios, D. Jacob, D. Natelson, C. Untiedt, Nature 458, 1150 (2009)
• 11. J. Martinek, Y. Utsumi, H. Imamura, J. Barnaś, S. Maekawa, J. König, G. Schön, Phys. Rev. Lett. 91, 127203 (2003)
• 12. J. Martinek, J. Barnaś, A. Fert, S. Maekawa, G. Schön, J. Appl. Phys. 90, 8265 (2003)
• 13. J. Martinek, Y. Utsumi, H. Imamura, J. Barnaś, S. Maekawa, J. König, G. Schön, Phys. Rev. Lett. 91, 247202 (2003)
• 14. M.-S. Choi, D. Sanchez, R. Lopez, Phys. Rev. Lett. 92, 056601 (2004)
• 15. Y. Utsumi, J. Martinek, G. Schön, H. Imamura, S. Maekawa, Phys. Rev. B 71, 245116 (2005)
• 16. L.F. Schelp, A. Fert, F. Fettar, P. Holody, S.F. Lee, J.L. Maurice, F. Petroff, A. Vaurès, Phys. Rev. B 56, R5747 (1997)
• 17. H. Sukegawa, S. Nakamura, A. Hirohata, N. Tezuka, K. Inomata, Phys. Rev. Lett. 94, 068304 (2005)
• 18. K. Yakushiji, F. Ernult, H. Imamura, K. Yamane, S. Mitani, K. Takanashi, S. Takahashi, S. Maekawa, H. Fujimori, Nature Mater. 4, 57 (2005)
• 19. S.S.P. Parkin, C. Kaiser, A. Panchula, P.M. Rice, B. Hughes, M. Samant, S.-H. Yang, Nature Mater. 3, 862 (2004)
• 20. H. Yang, S. Yang, S. Parkin, Nano Lett. 8, 340 (2008)
• 21. I. Weymann, J. Barnaś, J. König, J. Martinek, G. Schön, Phys. Rev. B 72, 113301 (2005); 72, 115334 (2005)
• 22. S. Moriyama, J. Martinek, G. Ilnicki, T. Fuse, K. Ishibashi, Phys. Rev. B 80, 033408 (2009)
• 23. A.J. Heinrich, J.A. Gupta, C.P. Lutz, D.M. Eigler, Science 306, 466 (2004)

Identifiers

DOI

10.12693/APhysPolA.118.316