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2017 ; 7
(1
): 4736
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Nanometric alternating magnetic field generator
#MMPMID28680166
Espejo AP
; Tejo F
; Vidal-Silva N
; Escrig J
Sci Rep
2017[Jul]; 7
(1
): 4736
PMID28680166
show ga
In this work we introduce an alternating magnetic field generator in a
cylindrical nanostructure. This field appears due to the rotation of a magnetic
domain wall located at some position, generating a magnetic region that varies
its direction of magnetization alternately, thus inducing an alternating magnetic
flux in its vicinity. This phenomenon occurs due to the competition between a
spin-polarized current and a magnetic field, which allows to control both the
angular velocity and the pinning position of the domain wall. As proof of
concept, we study the particular case of a diameter-modulated nanowire with a
spin-polarized current along its axis and the demagnetizing field produced by its
modulation. This inhomogeneous field allows one to control the angular velocity
of the domain wall as a function of its position along the nanowire allowing
frequencies in the GHz range to be achieved. This generator could be used in
telecommunications for devices in the range of radiofrequencies or, following
Faraday's induction law, could also induce an electromotive force and be used as
a movable alternate voltage source in future nanodevices.
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