Huge Ballistic Magnetoresistance in Multiple Nanocontacts Devices

TL;DR

This study demonstrates large, stable magnetoresistance effects in nanocontact systems with oxidized Fe particles, showing potential for magnetic sensing applications.

Contribution

The paper reports the first extensive experimental characterization of huge magnetoresistance in nanocontacts with oxidized Fe particles, highlighting its stability and reproducibility.

Findings

Over 1000% room temperature magnetoresistance

Non-linear I-V characteristics under various conditions

High thermal stability and reproducibility

Abstract

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