Spin flip diffusion length and giant magnetoresistance at low temperatures

Abstract

Measurements at 4.2 K. of the magnetoresistance of Co/AgMn, Co/CuMn, Co/AgPt, and (:o/CuPi muitilayers with the current perpendicular to the layer planes (CPP-MR) show effects of reduced spin diA'usion lengths due to alloying of the nonmagnetic metal with impurities that produce spin-spin (Mn) or spin-orbit (Pt) scattering. Combining the data with u theory by Valet and Fert gives the spin diA'usion lengths in the alloys.

Temperature-Dependent Asymmetry of the Nonlocal Spin-Injection Resistance: Evidence for Spin Nonconserving Interface Scattering

“…(5) we found that the spin diffusion length was 546 nm and the product of the spin polarizations of the two magnetic contacts was P 1 P 2 p 5:5%. The value of the SDL is comparable to the values measured using GMR [23] (450 nm) and transparent F=N=F spin valves [20] (1000 nm). The values of the spin polarization are also in agreement with those measured using F=N=F spin valves [16].…”

Current and spin torque in double tunnel barrier ferromagnet-superconductor- ferromagnet systems

“…Besides, the spin-flip relaxation time decreases in small metal particles due to the enhanced scattering rate at the surface 2 and in materials with magnetic impurities due to the spin-spin scattering. 11 We, therefore, consider the long spin-flip relaxation τ sf ∼ 10 −8 s an optimistic estimate in small superconducting Al particles and believe that times of the order τ sf ∼ 10 −11 s are currently easier to achieve experimentally.…”

Dependence of spin pumping and spin transfer torque upon Ni81Fe19 thickness in Ta/Ag/Ni81Durrant1, Shelford2, Valkass3 et al. 2017Phys. Rev. B13170View full textAdd to dashboardCite

“…16,17 The penetration of the spin current into the ferromagnetic sink layer has been studied by means of magnetotransport measurements, which have indicated a characteristic length for the absorption of the longitudinal component of spin (i.e. parallel or anti-parallel to M) in 3d transition metals 18,19 . Here the dependence on distance from the interface z was found to be exponential with spin current density i.e.…”

“…Spin pumping has been studied within Ta/Ag/Ni 81 Fe 19 (0-5 nm)/Ag(6 nm)/Co 2 MnGe(5 nm)/Ag/Ta large-area spin valve structures, and the transverse spin current absorption of Ni 81 Fe 19 sink layers of different thickness has been explored. In some circumstances the spin current absorption can be inferred from the modification of the Co 2 MnGe source layer damping in vector network analyser ferromagnetic resonance (VNA-FMR) experiments.…”