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Reduction of Threshold Current for Domain Wall Depinning Using Gd Doping of Permalloy

DOI: 10.1143/APEX.3.083002 DOI Help

Authors: Serban Lepadatu (University of Leeds) , Jill Claydon (University of Sheffield) , David Ciudad , Adam Naylor , Christy Kinane (ISIS Pulsed Neutron and Muon Source) , Sean Langridge (ISIS, STFC Rutherford Appleton Laboratory) , Sarnjeet Dhesi (Diamond Light Source) , Christopher Marrows (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Express , VOL 3 , PAGES 083002

State: Published (Approved)
Published: July 2010

Abstract: The dependence of threshold current on applied magnetic field for domain wall depinning from a pinning potential in Gd doped permalloy wires is measured using pulsed current measurements. By increasing the Gd concentration we find a marked reduction in threshold currents. This is shown to arise due to the enhanced non-adiabatic spin-transfer torque: we calculate the non-adiabaticity parameter β to be around 0.11 for 10% Gd concentration. On the other hand we show that the adiabatic spin-transfer torque is largely unaffected by Gd concentrations up to 10%.

Subject Areas: Physics


Instruments: I06-Nanoscience