Giant Magnetoresistance in Nanogranular Magnets

Details Giant Magnetoresistance in Nanogranular Magnets Giant Magnetoresistance in Nanogranular Magnets

2007-10-03

arxiv.org/abs/0710.0836v2

EuroPhys. Lett. 82, 47002 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1209/0295-5075/82/47002

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.

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