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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:323

Article

Kiss, L. F.¹  Franco, V.²  Csontos, M.^3,4  Peter, L.¹  Conde, C. F.²  Conde, A.²  Kemeny, T.¹  Toth, J.¹  Varga, L. K.¹  Bakonyi, I.¹ 

[1] Hungarian Acad Sci, Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

[2] Univ Seville, CSIC, Dept Fis Mat Condensada, Inst Ciencia Mat, E-41080 Seville, Spain

[3] Budapest Univ Technol & Econ, Dept Phys, Inst Phys, H-1111 Budapest, Hungary

[4] Hungarian Acad Sci, Res Grp, H-1111 Budapest, Hungary

关键词: Magnetoresistance;    Amorphous alloys;    Nanocrystallization;    FINEMET alloys;    Fe-Si alloys;   

DOI  :  10.1016/j.jmmm.2010.10.026

来源: Elsevier

【 摘 要 】

The magnetoresistance (MR) was measured at 200, 250 and 300 K in magnetic fields upto B = 12 T for a nanocrystallized Fe63.5Cr10Nb3Cu1Si13.5B9 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 Fe-Si 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 dipole-dipole 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 equivalent to 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 Fe-Si nanograins having a D0(3) structure. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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