Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-02-11
Eur. Phys. J. B 60, 187-192 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 7 figures
Scientific paper
10.1140/epjb/e2007-00335-8
We investigated the mean-free path effects on the magnetoresistance of ferromagnetic nanocontacts. For most combinations of parameters the magnetoresistance monotonously decreases with increasing the contact cross-section. However, for a certain choice of parameters the calculations show non-monotonous behavior of the magnetoresistance in the region in which the diameter of the contact becomes comparable with the mean-free path of electrons. We attribute this effect to different conduction regimes in the vicinity of the nanocontact: ballistic for electrons of one spin projection, and simultaneously diffusive for the other. Furthermore, at certain combinations of spin asymmetries of the bulk mean-free paths in a heterocontact, the magnetoresistance can be almost constant, or may even grow as the contact diameter increases. Thus, our calculations suggest a way to search for combinations of material parameters, for which high magnetoresistances can be achieved not only at the nanometric size of the contact, but also at much larger cross-sections of nanocontacts which can be easier for fabrication with current technologies. The trial calculations of the magnetoresistance with material parameters close to those for the Mumetal-Ni heterocontacts agree satisfactorily with the available experimental data.
Deminov R. G.
Pan Guoshuang
Tagirov L. R.
Useinov A. N.
Zhou Yanhua
No associations
LandOfFree
Mean-free path effects in magnetoresistance of ferromagnetic nanocontacts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mean-free path effects in magnetoresistance of ferromagnetic nanocontacts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mean-free path effects in magnetoresistance of ferromagnetic nanocontacts will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-625236