Cart (Loading....) | Create Account
Close category search window
 

Voltage and temperature dependence of high-field magnetoresistance in arrays of magnetic nanoparticles

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Tan, Reasmey P. ; INSA, UPS, CNRS, LPCNO, Université de Toulouse, 135 Avenue de Rangueil, Toulouse F-31077, France ; Carrey, Julian ; Respaud, Marc

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2957061 

Huge values of high-field magnetoresistance have been recently reported in large arrays of ferromagnetic CoFe nanoparticles embedded in an organic insulating matrix in the Coulomb blockade regime. The magnetoresistance displays two characteristic behaviors: a scaling with the magnetic field/temperature ratio and an unusual exponential decrease with increasing voltage. To describe all these features, we propose a model where the electronic charges tunnel from one nanoparticle to another through a paramagnetic impurity. It is assumed that the noncollinearity between the magnetic moment of the ferromagnetic nanoparticles and the paramagnetic moment induces an effective tunnel barrier, the height of which depends on the relative angle of the paramagnetic moment with respect to the ferromagnetic one. A systematic study of the magnetoresistance behavior as a function of the effective tunnel barrier parameters and applied bias voltage is carried out. Finally, we show that by using Fowler–Nordheim current expressions, i.e., in the hypothesis of small energy barriers, the main features of the magnetoresistance are well reproduced with realistic parameters.

Published in:

Journal of Applied Physics  (Volume:104 ,  Issue: 2 )

Date of Publication:

Jul 2008

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.