Strong magnetic scattering in weak localization
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abstract
Theoretical analysis of weak localization for the three dimensional system presently does not include the case with strong scattering by local magnetic impurities. For paramagnetic Fe 0.33Zr 0.67 alloy, a composition just below the ferromagnetic phase boundary, the magnetic impurity scattering time ( s) is estimated to be comparable to the spin-orbit scattering time ( so), but much less than the magnetic field dephasing time ( H) or inelastic scattering time ( i), so that the magnetic scattering occurs before the magnetic field dephasing does. When the local moments of magnetic impurities (in this case some of the Fe ions) do not interact with each other and their magnetization follows the Brillouin function, the magneto-resistance MR is proportional to ns 1/2(H/T) 2 for small (H/T), where n s is the density of local impurities of moment gS B, and (H, T)/ 2 should be a unique function of (H/T), for a given alloy so long as the impurities are in the Curie regime. Experimental values of the MR at several temperatures for the Fe 0.33Zr 0.67 alloy lie on a single curve of (H, T)/ 2 vs. H/T 1996 IEEE.
