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Spin-Diffusion Lengths in Dilute Cu(Ge) and Ag(Sn) Alloys

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arxiv 0809.2250 v1 pith:IUNMK222 submitted 2008-09-12 cond-mat.mtrl-sci

Spin-Diffusion Lengths in Dilute Cu(Ge) and Ag(Sn) Alloys

Q. Fowler , B. Richard , A. Sharma , N. Theodoropoulou , R. Loloee , W.P. Pratt Jr. , J. Bass This is my paper
classification cond-mat.mtrl-sci
keywords alloyscross-sectionlengthsspin-orbitvalueagreementanalysisbeen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We use current-perpendicular-to-plane (CPP) exchange-biased spin-valves to directly measure spin diffusion lengths lsf for N = Cu(2.1 at.%Ge) and Ag(3.6 at.%Sn) alloys. We find lsf(Cu2%Ge)) = 117+10-6 nm and lsf(Ag4%Sn)= 39 +/- 3 nm. The good agreement of this lsf(Cu2%Ge) with the value lsf(Cu2%Ge) = 121 +/- 10 nm derived from an independent spin-orbit cross-section measurement for Ge in Cu, quantitatively validates the use of Valet-Fert theory for CPP-MR data analysis to layer thicknesses several times larger than had been done before. From the value of lsf(Ag4%Sn), we predict the ESR spin-orbit cross-section for Sn impurities in Ag.

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