Abstract
Spin-injection efficiency may be affected by interface geometry and it was investigated theoretically by considering a nonmagnetic (NM) sphere embedded in a ferromagnetic (FM) host. When spin-polarized current is injected into the NM sphere from the FM host, it is found that spinsplitting of the electrochemical potential is enhanced at the interface while the spin polarization of the electrical current is reduced compared with the flat interface. In the Co/Cu and the Py/Cu systems, the values are different from those of the flat interface even when the sphere radius is 3 μm. Attachment of another NM electrode to the NM sphere changes the spin-splitting of the electrochemical potential, which may be critical for the nonlocal spin signal in the lateral spin valve.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Handbook of Spin Transport and Magnetism, edited by E. Y. Tsymbal and I. Ẑutić (CRC press, Boca Raton, 2012).
A. Fert, Rev. Mod. Phys. 80, 1517 (2008).
S. Yuasa and D. D. Djayaprawira, J. Phys. D: Appl. Phys. 40, R337 (2007).
F. J. Jedema, A. Filip and B. J. van Wees, Nature (London) 410, 345 (2001).
Semiconductor Spintronics and Quantum Computation, edited by D. D. Awschalom, D. Loss and N. Samarth (Springer-Verlag, Berlin, 2002).
J. Hamrle, T. Kimura, Y. Otani, K. Tsukagoshi and Y. Aoyagi, Phys. Rev. B 71, 094402 (2005).
J-H Ku, H. C. Koo, S. H. Han, J. Eom, G. Kim and J. Chang, Solid-State Electronics 89, 72 (2013).
T. Kimura, Y. Otani and J. Hamrle, Phys Rev B 73, 132405 (2006).
B. C. Lee, J. Korean Phys. Soc. 52, 528 (2008).
P. van Son, H. van Kampen and P. Wyder, Phys. Rev. Lett. 58, 2271 (1987).
M. Johnson and R. H. Silsbee, Phys. Rev. B 35, 4959 (1987); ibid. 37, 5312 (1988).
T. Valet and A. Fert, Phys. Rev. B 48, 7099 (1993).
S. Hershfield and H. L. Zhao, Phys. Rev. B 56, 3296 (1997).
G. Schmidt, D. Ferrand, L. W. Molenkamp, A. T. Filip and B. J. van Wees, Phys. Rev. B 62, R4790 (2000).
J. Bass and W. P. Pratt Jr., J. Magn. Magn. Mater. 200, 274 (1999).
A. Fert and L. Piraux, J. Magn. Magn. Mater. 200, 338 (1999).
A. Fert and H. Jaffres, Phys. Rev. B 64, 184420 (2001).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lee, B.C. Effects of interface geometry on spin injection. Journal of the Korean Physical Society 71, 587–590 (2017). https://doi.org/10.3938/jkps.71.587
Received:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.71.587