Phys. Rev. B 81, 060402(R) (2010) [4 pages]Domain-wall spin-torque resonators for frequency-selective operation
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. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.060402
DOI:
10.1103/PhysRevB.81.060402
PACS:
75.60.Ch, 72.25.Pn, 72.25.Ba
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