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Experimental determination of spin-transfer torque nonadiabaticity parameter and spin polarization in permalloy

DOI: 10.1103/PhysRevB.79.094402 DOI Help

Authors: Serban Lepadatu (School of Physics and Astronomy, E.C. Stoner Laboratory, University of Leeds) , Mark Hickey (School of Physics and Astronomy, E.C. Stoner Laboratory, University of Leeds) , Timothy Charlton (ISIS Pulsed Neutron and Muon Source) , Sean Langridge (ISIS, STFC Rutherford Appleton Laboratory) , Sarnjeet Dhesi (Diamond Light Source) , Helder Marchetto (Diamond Light Source) , Alessandro Potenza (Diamond Light Source) , Christopher Marrows (School of Physics and Astronomy, E.C. Stoner Laboratory, University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 79 (9)

State: Published (Approved)
Published: March 2009

Abstract: The domain-wall depinning boundary, showing the variation in critical current density with magnetic field, is measured for notched permalloy wires using pulsed-current measurements. The structure of domain walls trapped at the pinning potential provided by the notch is imaged using photoemission electron microscopy. The experimental depinning boundary is compared with those obtained by micromagnetic simulations including the adiabatic and nonadiabatic spin-torque terms. This method allows for the determination of both the nonadiabaticity parameter β and spin current polarization P, which we obtain as β=0.040±0.005 and P=0.40±0.02 at room temperature.

Subject Areas: Materials, Physics


Instruments: I06-Nanoscience

Added On: 02/04/2009 13:54

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