Huge Ballistic Magnetoresistance in Multiple Nanocontacts Devices

Details Huge Ballistic Magnetoresistance in Multiple Nanocontacts Devices Huge Ballistic Magnetoresistance in Multiple Nanocontacts Devices

2005-02-02

arxiv.org/abs/cond-mat/0502046v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

In this paper we report an exhaustive experimental work on magnetoresistance effects found in a system in which a large number of nanocontacts are produced between oxidized Fe fine particles. We have obtained the following performances: i) Huge low field room temperature magnetoresistance (over 1000%). ii) Non-linear I-V at different applied fields and temperatures. iii) Large thermal stability and reproducible resistance value under thermal cycles from room temperature down to 5 K. iv) Easy to fabricate with an almost 100% success. v) Heavy duty and transportable samples with reproducibility tested in several laboratories. We realized that the extraordinary effect found is related to the oxygen content at the particles surface

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