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Analysis of the magnetoresistance contributions in a nanocrystallized Cr-doped FINEMET alloy

AuthorsKiss, L.F.; Franco, V. ; Csontos, M. Péter, L; Conde, C. F.; Conde Amiano, Alejandro; Kemény, T.; Tóth, J.; Varga, L.K.; Bakonyi, I.
Issue Date2011
CitationJournal of Magnetism and Magnetic Materials 323: 699-707 (2011)
AbstractThe magnetoresistance (MR) was measured at 200, 250 and 300 K in magnetic fields up to B=12 T for a nanocrystallized Fe63.5Cr 10Nb3Cu1Si13.5B9 alloy. Both the longitudinal (LMR) and transverse (TMR) component of the magnetoresistance decreased from B=0 to about 0.1 T. This could be ascribed to a giant MR (GMR) effect due to spin-dependent scattering of conduction electrons along their path between two FeSi nanograins via the non-magnetic matrix. Such a scattering may occur if the nanograin moments are not or only weakly coupled in the absence of a strong exchange coupling (due to the high Cr content in the matrix) and/or only weak dipoledipole coupling is present (due to sufficiently large separations between the nanograins). For larger fields, the GMR saturated and a slightly nonlinear increase in MR with B was observed due to a contribution by the residual amorphous matrix. The anisotropic MR effect (AMR≡LMR-TMR) was negative for all fields and temperatures investigated. By measuring the MR of melt-quenched Fe100-xSix solid solutions with x=15, 18, 20, 25 and 28, the observed AMR could be identified as originating from the FeSi nanograins having a D03 structure. © 2010 Elsevier B.V. All rights reserved.
Identifiersdoi: 10.1016/j.jmmm.2010.10.026
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