Abstract
We present computer simulations of the magnetotransport properties of two-dimensional and three-dimensional granular ferromagnets using a random resistor network in which the conductivity, σ, between pairs of neighboring grains depends upon the intergrain distance [σαexp (-κr), where κ is a measure of disorder and r is a random number, 0≤r≤1] and the relative magnetic orientations. We study the resistance (R) distribution function, P (R), and find that in both the weak disorder regime L κμ >1 (not sensitive to the removal of any single bond) and the strong disorder regime L κμ <1 (very sensitive to such a removal) the distribution depends only on L κμ and can be well approximated by a log-normal function with dispersion b κμ L, where b is a coefficient which depends on the type of the lattice and μ is the critical exponent of the percolation correlation length.
Original language | English |
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Article number | 08P905 |
Journal | Journal of Applied Physics |
Volume | 99 |
Issue number | 8 |
DOIs | |
State | Published - 2006 |
Bibliographical note
Funding Information:This research was supported in part by grants from the US-Israel Binational Science Foundation, the Israel Science Foundation, and the KAMEA Fellowship program of the Ministry of Absorption of the State of Israel.
Funding
This research was supported in part by grants from the US-Israel Binational Science Foundation, the Israel Science Foundation, and the KAMEA Fellowship program of the Ministry of Absorption of the State of Israel.
Funders | Funder number |
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Ministry of Absorption of the State of Israel | |
United States-Israel Binational Science Foundation | |
Israel Science Foundation |