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Several Thousand-Fold Room Temperature Magnetoresistance in Ni Nanocontacts Made by Self-Terminating Electrodeposition

Published

Author(s)

H D. Chopra, S Z. Hua, William F. Egelhoff Jr.

Abstract

Recently, room temperature magnetoresistance effect as large as 3150% has been reported in electro-deposited Ni nanocontacts. In the present study, a simple self-terminating electrodeposition method [S. Boussaad and N.J. Tao, Appl. Phys. Lett. 80, 2398 (2002)] has been used to make reproducible and stable Ni nanocontacts, which routinely exhibit several thousand-fold magnetoresitance effect (as high as 5200%) at room temperature. The nanocontacts remain stable over a wide range of current densities (from ≈105 to 108 A/cm2); their ohmic nature is evident from the highly linear current-voltage (I-V) curves. Evidence of exchange coupling has been found whose strength varies in different nanocontacts, and whose role has not been previously considered. Results indicate dependence of magnetoresitance not only on the nanocontact diameter but also on the strength of the strength of the coupling across the nanocontact.
Citation
Journal of Applied Physics

Keywords

ballistic, electrodeposition, magnetoresistance, nanocontacts, nickel

Citation

Chopra, H. , Hua, S. and Egelhoff Jr., W. (2021), Several Thousand-Fold Room Temperature Magnetoresistance in Ni Nanocontacts Made by Self-Terminating Electrodeposition, Journal of Applied Physics (Accessed April 17, 2024)
Created October 12, 2021