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Domain-wall spin-torque resonators for frequency-selective operation

DOI: 10.1103/PhysRevB.81.060402 DOI Help

Authors: S. Lepadatu (University of Leeds) , O. Wessely (Imperial College, London; City University, London) , A. Vanhaverbeke (IBM Research) , R. Allenspach (IBM Research) , A. Potenza (Diamond Light Source) , H. Marchetto (Diamond Light Source) , T. Charlton (ISIS Pulsed Neutron and Muon Source) , S. Langridge (ISIS, STFC Rutherford Appleton Laboratory) , S. Dhesi (Diamond Light Source) , C. Marrows (University of Leeds)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Physical Review B , VOL 81 (6) , PAGES 060402

State: Published (Approved)
Published: February 2010

Abstract: In this work we demonstrate control of the spin-torque resonance frequency of a domain wall (DW) in a notched wire through the lithographic engineering of the shape and profile of the notch. By modeling the magnetization dynamics of a current-driven domain wall in a nanometric constrained geometry, an almost harmonic pinning potential has been designed, and we experimentally demonstrate the operation of domain wall resonators with well-defined, selectable resonance frequencies, suitable for application in zero magnetic field. These results show that the DW may be treated to a good approximation as a quasiparticle acted on by a restoring force that may be derived from the notch shape in a physically transparent manner.

Subject Areas: Physics

Instruments: I06-Nanoscience

Added On: 18/02/2010 15:17

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