Volume 82, Number 4, May 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 May 2008|
Giant magnetoresistance in nanogranular magnets
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
2 James Franck Institute, University of Chicago - Chicago, IL 60637, USA
Corresponding author: firstname.lastname@example.org
Accepted: 27 March 2008
We study the giant magnetoresistance of nanogranular magnets in the presence of an external magnetic field and finite temperature. We show that the magnetization of arrays of nanogranular magnets has hysteretic behaviour at low temperatures leading to a double peak in the magnetoresistance which coalesces at high temperatures into a single peak. We numerically calculate the magnetization of magnetic domains and the motion of domain walls in this system using a combined mean-field approach and a model for an elastic membrane moving in a random medium, respectively. From the obtained results, we calculate the electric resistivity as a function of magnetic field and temperature. Our findings show excellent agreement with various experimental data.
PACS: 75.47.De – Giant magnetoresistance / 75.60.-d – Domain effects, magnetization curves, and hysteresis / 75.75.+a – Magnetic properties of nanostructures
© EPLA, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.