Spin relaxation through Kondo scattering in Cu/Py lateral spin valves

J. T. Batley, M. C. Rosamond, M. Ali, E. H. Linfield, G. Burnell, B. J. Hickey

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The temperature dependence of the spin diffusion length typically reflects the scattering mechanism responsible for spin relaxation. Within nonmagnetic metals it is reasonable to expect the Elliot-Yafet mechanism to play a role and thus the temperature dependence of the spin diffusion length might be inversely proportional to resistivity. In lateral spin valves, measurements have found that at low temperatures the spin diffusion length unexpectedly decreases. By measuring the transport properties of lateral Py/Cu/Py spin valves, fabricated from Cu with magnetic impurities of <1 ppm and ∼4 ppm, we extract a spin diffusion length which shows this suppression below 30 K only in the presence of the Kondo effect. We have calculated the spin-relaxation rate and isolated the contribution from magnetic impurities. We find the spin-flip probability of a magnetic impurity to be 34%. Our analysis demonstrates the dominant role of Kondo scattering in spin relaxation, even in low concentrations of order 1 ppm, and hence illustrates its importance to the reduction in spin diffusion length observed by ourselves and others.

Original languageEnglish (US)
Article number220420
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number22
DOIs
StatePublished - Dec 28 2015

Fingerprint

Scattering
scattering
diffusion length
Impurities
Kondo effect
Transport properties
Temperature
impurities
Metals
temperature dependence
low concentrations
transport properties
retarding
electrical resistivity
metals

Cite this

Batley, J. T., Rosamond, M. C., Ali, M., Linfield, E. H., Burnell, G., & Hickey, B. J. (2015). Spin relaxation through Kondo scattering in Cu/Py lateral spin valves. Physical Review B - Condensed Matter and Materials Physics, 92(22), [220420]. https://doi.org/10.1103/PhysRevB.92.220420

Spin relaxation through Kondo scattering in Cu/Py lateral spin valves. / Batley, J. T.; Rosamond, M. C.; Ali, M.; Linfield, E. H.; Burnell, G.; Hickey, B. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 22, 220420, 28.12.2015.

Research output: Contribution to journalArticle

Batley, J. T. ; Rosamond, M. C. ; Ali, M. ; Linfield, E. H. ; Burnell, G. ; Hickey, B. J. / Spin relaxation through Kondo scattering in Cu/Py lateral spin valves. In: Physical Review B - Condensed Matter and Materials Physics. 2015 ; Vol. 92, No. 22.
@article{1ebdd1469b4c450dae01cb3dbc353ad8,
title = "Spin relaxation through Kondo scattering in Cu/Py lateral spin valves",
abstract = "The temperature dependence of the spin diffusion length typically reflects the scattering mechanism responsible for spin relaxation. Within nonmagnetic metals it is reasonable to expect the Elliot-Yafet mechanism to play a role and thus the temperature dependence of the spin diffusion length might be inversely proportional to resistivity. In lateral spin valves, measurements have found that at low temperatures the spin diffusion length unexpectedly decreases. By measuring the transport properties of lateral Py/Cu/Py spin valves, fabricated from Cu with magnetic impurities of <1 ppm and ∼4 ppm, we extract a spin diffusion length which shows this suppression below 30 K only in the presence of the Kondo effect. We have calculated the spin-relaxation rate and isolated the contribution from magnetic impurities. We find the spin-flip probability of a magnetic impurity to be 34{\%}. Our analysis demonstrates the dominant role of Kondo scattering in spin relaxation, even in low concentrations of order 1 ppm, and hence illustrates its importance to the reduction in spin diffusion length observed by ourselves and others.",
author = "Batley, {J. T.} and Rosamond, {M. C.} and M. Ali and Linfield, {E. H.} and G. Burnell and Hickey, {B. J.}",
year = "2015",
month = "12",
day = "28",
doi = "10.1103/PhysRevB.92.220420",
language = "English (US)",
volume = "92",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
number = "22",

}

TY - JOUR

T1 - Spin relaxation through Kondo scattering in Cu/Py lateral spin valves

AU - Batley, J. T.

AU - Rosamond, M. C.

AU - Ali, M.

AU - Linfield, E. H.

AU - Burnell, G.

AU - Hickey, B. J.

PY - 2015/12/28

Y1 - 2015/12/28

N2 - The temperature dependence of the spin diffusion length typically reflects the scattering mechanism responsible for spin relaxation. Within nonmagnetic metals it is reasonable to expect the Elliot-Yafet mechanism to play a role and thus the temperature dependence of the spin diffusion length might be inversely proportional to resistivity. In lateral spin valves, measurements have found that at low temperatures the spin diffusion length unexpectedly decreases. By measuring the transport properties of lateral Py/Cu/Py spin valves, fabricated from Cu with magnetic impurities of <1 ppm and ∼4 ppm, we extract a spin diffusion length which shows this suppression below 30 K only in the presence of the Kondo effect. We have calculated the spin-relaxation rate and isolated the contribution from magnetic impurities. We find the spin-flip probability of a magnetic impurity to be 34%. Our analysis demonstrates the dominant role of Kondo scattering in spin relaxation, even in low concentrations of order 1 ppm, and hence illustrates its importance to the reduction in spin diffusion length observed by ourselves and others.

AB - The temperature dependence of the spin diffusion length typically reflects the scattering mechanism responsible for spin relaxation. Within nonmagnetic metals it is reasonable to expect the Elliot-Yafet mechanism to play a role and thus the temperature dependence of the spin diffusion length might be inversely proportional to resistivity. In lateral spin valves, measurements have found that at low temperatures the spin diffusion length unexpectedly decreases. By measuring the transport properties of lateral Py/Cu/Py spin valves, fabricated from Cu with magnetic impurities of <1 ppm and ∼4 ppm, we extract a spin diffusion length which shows this suppression below 30 K only in the presence of the Kondo effect. We have calculated the spin-relaxation rate and isolated the contribution from magnetic impurities. We find the spin-flip probability of a magnetic impurity to be 34%. Our analysis demonstrates the dominant role of Kondo scattering in spin relaxation, even in low concentrations of order 1 ppm, and hence illustrates its importance to the reduction in spin diffusion length observed by ourselves and others.

UR - http://www.scopus.com/inward/record.url?scp=84953775139&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84953775139&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.92.220420

DO - 10.1103/PhysRevB.92.220420

M3 - Article

AN - SCOPUS:84953775139

VL - 92

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

IS - 22

M1 - 220420

ER -