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Correlation between spin dependent scattering and impurity polarization in CPP‐GMR spin valves with ultra thin Cu inserted Fe‐Co layers
Author(s) -
Isogami S.,
Tsunoda M.,
Noguchi K.,
Nakamura T.,
Osawa H.,
Takahashi M.
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.200777306
Subject(s) - scattering , impurity , condensed matter physics , giant magnetoresistance , materials science , spin polarization , spin (aerodynamics) , thin film , magnetic circular dichroism , polarization (electrochemistry) , magnetoresistance , chemistry , nanotechnology , electron , magnetic field , spectral line , optics , physics , organic chemistry , quantum mechanics , astronomy , thermodynamics
The correlation between the magnitudes of spin dependent scattering (Δ RA ) and impurity polarization was examined in current perpendicular to plane (CPP‐) giant magnetoresistance (GMR) films with ultra‐thin Cu inserted Fe‐Co layers, with changing the chemical compositon of Fe‐Co. The enhancing effect of Δ RA by Cu insertion was remarkable for Fe 70 Co 30 layers in which the body centered cubic structure is maintained against Cu insertion and large spin polarization of dissolved Cu is observed via X‐ray magnetic circular dichroism. We thus conclude that the enhancement of spin dependent scattering originates from the spin polarized Cu atoms embedded in Fe‐Co alloys. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)