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The increase of the spin-transfer torque threshold current density in coupled vortex domain walls

DOI: 10.1088/0953-8984/24/2/024210 DOI Help
PMID: 22173240 PMID Help

Authors: S. Lepadatu (University of Leeds) , A. Mihai (University of Leeds) , J. S. Claydon , F. Maccherozzi (Diamond Light Source) , S. Dhesi (Diamond Light Source) , C. Kinane (ISIS Pulsed Neutron and Muon Source) , S. Langridge (ISIS, STFC Rutherford Appleton Laboratory) , C. Marrows (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 24 (2)

State: Published (Approved)
Published: December 2011

Abstract: We have studied the dependence on the domain wall structure of the spin-transfer torque current density threshold for the onset of wall motion in curved, Gd-doped Ni80Fe20 nanowires with no artificial pinning potentials. For single vortex domain walls, for both 10% and 1% Gd-doping concentrations, the threshold current density is inversely proportional to the wire width and significantly lower compared to the threshold current density measured for transverse domain walls. On the other hand for high Gd concentrations and large wire widths, double vortex domain walls are formed which require an increase in the threshold current density compared to single vortex domain walls at the same wire width. We suggest that this is due to the coupling of the vortex cores, which are of opposite chirality, and hence will be acted on by opposing forces arising through the spin-transfer torque effect.

Journal Keywords: Chirality; Coupling; Current Density; Density; Doped Materials; Gadolinium Additions; Iron Alloys; Nanostructures; Nickel Alloys; Quantum Wires; Spin; Threshold Current; Torque; Vortices

Subject Areas: Physics

Instruments: I06-Nanoscience