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Phase-resolved x-ray ferromagnetic resonance measurements of spin pumping in spin valve structures

DOI: 10.1103/PhysRevB.87.180403 DOI Help

Authors: M. Marcham (University of Exeter) , L. Shelford (Diamond Light Source) , S. Cavill (University of York, Diamond Light Source) , P Keatley (University of Exeter) , W. Yu (University of Exeter) , P. Shafer (Advanced Light Source) , A. Neudert (Forschungszentrum Dresden-Rossendorf e. V.) , J. R. Childress (San Jose Research Center) , J. A. Katine (San Jose Research Center) , E. Arenholz (Lawrence Berkeley National Laboratory) , N. Telling (Keele University) , G. Van Der Laan (Diamond Light Source) , R. Hicken (University of Exeter)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 87 (18)

State: Published (Approved)
Published: May 2013

Abstract: Element-specific phase-resolved x-ray ferromagnetic resonance (FMR) was used to study spin pumping within Co50Fe50(3)/Cu(6)/Ni80Fe20(5) (thicknesses in nanometers) spin valve structures with large areas, so that edge effects typical of nanopillars used in standard magnetotransport experiments could be neglected. The phase of precession of the Co50Fe50 fixed layer was recorded as FMR was induced in the Ni80Fe20 free layer. The field ependence of the fixed layer phase contains a clear signature of spin transfer torque (STT) coupling due to spin pumping. Fitting the phase delay yields the spin-mixing conductance, the quantity that controls all spin transfer phenomena. The STT coupling is destroyed by insertion of Ta into the middle of the Cu layer.

Journal Keywords: Phase-Resolved X-Ray Ferromagnetic Resonance Measurements Of Spin Pumping

Subject Areas: Physics, Materials

Instruments: I06-Nanoscience

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