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Inverse giant magnetoresistance due to spin‐dependent bulk scattering in Fe 1–x Cr x /Cu/Co
Author(s) -
Thi Ngoc Anh Nguyen,
Thi Hoang Yen Nguyen,
Yi Hyunjung,
Joo SungJung,
Shin KyungHo
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200777266
Subject(s) - giant magnetoresistance , condensed matter physics , scattering , magnetoresistance , ferromagnetism , inverse , materials science , asymmetry , spin (aerodynamics) , anisotropy , physics , magnetic field , optics , geometry , mathematics , quantum mechanics , thermodynamics
Inverse giant magnetoresistance (IGMR) can be observed in multilayers with alternating two ferromagnetic layers F1 and F2 possessing opposite spin scattering asymmetries. We report here the observation of inverse current‐in‐plane giant magnetoresistance (CIP‐IGMR) in Fe 1–x Cr x /Cu/Co spin‐valve systems with varying Cr concentration and FeCr‐layer thickness. The highest magnitude of IGMR, –0.45%, has been achieved in the sample doped with 35 at.% Cr. It is shown that the proper substitution of Cr for Fe can alter spin‐dependent scattering in the Fe layer, causing the inversion of the bulk spin scattering asymmetry coefficient therefore resulting in CIP‐IGMR. The GMR has a dominant contribution to the observed inverse MR, rather than the anisotropic magnetoresistance (AMR) component. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)