Magnetoresistance of the thin film ferromagnetic nanoconstrictions |
| |
Authors: | Hao Cheng Wei Yang Hong Liu LingJiang Wang |
| |
Institution: | School of Electronic and Information Engineering, Chengdu University, Chengdu 610106, China |
| |
Abstract: | The magnetoresistance and I–V characteristics at different temperatures of the thin film ferromagnetic nanoconstrictions of variable width (from 20 to
250 nm) and 10 nm thicknesses, fabricated by electron beam lithography and vacuum thin film deposition are compared. The magnetoresistance
and resistance of the thin film ferromagnetic nanoconstrictions are not related to the width of the nanoconstrictions. Instead
the resistance of the local nano-region in the middle of the thin film ferromagnetic nanoconstriction has only a minor role
compared to that of the two microscale thin film ferromagnetic electrodes, which contribute the majority of the measured resistance.
The magnetoresistances of the thin film ferromagnetic nanoconstrictions and a 0.2 cm × 0.8 cm thin ferromagnetic film deposited
under the same conditions were also compared; the thin film ferromagnetic nanoconstrictions have higher magnetoresistances
than the thin ferromagnetic film, which implies that the measured magnetoresistance of the thin film ferromagnetic nanoconstrictions
comes mainly from the local nano-region in their centers. In conclusion, the measured magnetoresistance of the whole sample
is similar to the anisotropic magnetoresistance, because the resistance of the two microscale thin film ferromagnetic electrodes
is much higher than that of the local nano-region in the middle of the samples. Comparing the experimental results for the
thin film ferromagnetic nanoconstrictions and the thin ferromagnetic film reveals that the magnetoresistance of the local
nano-region in the middle of the sample is much higher than that of the two microscale thin film ferromagnetic electrodes
attached to it. |
| |
Keywords: | thin film vacuum deposition ferromagnetic nanoconstrictions anisotropic magnetoresistance ballistic magnetoresistance |
本文献已被 CNKI 维普 SpringerLink 等数据库收录! |