Determination of Domain Wall Depinning and Driving Currents in Doped Permalloy Structures

DOI: 10.1109/TMAG.2010.2042578

Authors: S. Lepadatu (University of Leeds) , J. S. Claydon (University of Sheffield) , D. Ciudad (University of Leeds) , C. Kinane (ISIS) , S. Langridge (ISIS, STFC Rutherford Appleton Laboratory) , S. Cavill (University of York, Diamond Light Source) , S. Dhesi (Diamond Light Source) , C. Marrows (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Ieee Transactions On Magnetics , VOL 46 (6) , PAGES 1759-1761

State: Published (Approved)
Published: January 2010

Abstract: In this paper we investigate the domain wall pinning positions at parabolic pinning potentials in Gd doped Ni80Fe20 wires. Increasing the Gd doping percentage favors the formation of vortex domain walls, shown to be due to an increase in the out of plane anisotropy, allowing the pinning of a vortex and a transverse domain wall in two similar parabolic pinning potentials. Using pulsed currents to investigate the difference in the depinning characteristics of these two domain wall types, we show that the current density required for steady domain wall motion is smaller than the current density required to set it in motion and estimate this difference to be of the order 10(11) A/cm(2).

Subject Areas: Physics


Instruments: I06-Nanoscience