Enhancing domain wall speed in nanowires with transverse magnetic fields

Kunz, Andrew; Reiff, Sarah C.

doi:10.1063/1.2829032

Cited by 60 publications

(59 citation statements)

References 11 publications

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“…The domain wall speed is known to depend on the size of the domain wall and using magnetic fields to change the wall size is known to change the wall speed. 4,15 The same mechanism is responsible for the direct relationship between the transverse core speed and diameter.…”

Section: Results and Analysismentioning

confidence: 99%

Antivortex dynamics in magnetic nanostripes

Kunz

Breitbach

Smith

2009

Journal of Applied Physics

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In a thin magnetic nanostripe, an antivortex nucleates inside a moving domain wall when driven by an in-plane magnetic field greater than the so-called Walker field. The nucleated antivortex must cross the width of the nanostripe before the domain wall can propagate again, leading to low average domain wall speeds. A large out-of-plane magnetic field, applied perpendicularly to the plane of the nanostripe, inhibits the nucleation of the antivortex leading to fast domain wall speeds for all in-plane driving fields. We present micromagnetic simulation results relating the antivortex dynamics to the strength of the out-of-plane field. An asymmetry in the motion is observed which depends on the alignment of the antivortex core magnetic moments to the direction of the out-of-plane field. The size of the core is directly related to its crossing speed, both depending on the strength of the perpendicular field and the alignment of the core moments and direction of the out-of-plane field.

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Section: Results and Analysismentioning

confidence: 99%

Antivortex dynamics in magnetic nanostripes

Kunz

Breitbach

Smith

2009

Journal of Applied Physics

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“…Among them, using a TMF is the easiest way. Thus it is of great value to systematically investigate the TDW dynamics under TMFs, which is also an issue of interest in the academic community in recent years [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62]. Most existing works are numerical [43][44][45][46][47] or experimental [48][49][50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Statics and field-driven dynamics of transverse domain walls in biaxial nanowires under uniform transverse magnetic fields

Lü

2016

Phys. Rev. B

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In this work, we report analytical results on transverse domain wall (TDW) statics and field-driven dynamics in quasi one-dimensional biaxial nanowires under arbitrary uniform transverse magnetic fields (TMFs) based on the Landau-Lifshitz-Gilbert equation. Without axial driving fields, the static TDW should be symmetric about its center meanwhile twisted in its azimuthal angle distribution. By decoupling of polar and azimuthal degrees of freedom, an approximate solution is provided which reproduces these features to a great extent. When an axial driving field is applied, the dynamical behavior of a TDW is viewed as the response of its static profile to external excitations. By means of the asymptotic expansion method, the TDW velocity in traveling-wave mode is obtained, which provides the extent and boundary of the "velocity-enhancement" effect of TMFs to TDWs in biaxial nanowires. Finally numerical simulations are performed and strongly support our analytics.

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“…Perpendicular in-plane fields (y-axis) are also applied. The modest strength of these transverse fields (< 150 Oe) does not alter the breakdown field but is useful for creating domain walls of a known orientation which eases the injection process, leads to increased speed, and can be used for precision control of the final location 8,10,11 . The use of a transverse field is critical for each aspect of domain wall control as described below.…”

Section: Micromagnetic Simulation Detailsmentioning

confidence: 99%

“…The wall moves rapidly at 412 m/s along the wire until it reaches the notch at 16 ns, at which point it becomes trapped. When a field is applied transverse to the wires long axis and in the direction of the magnetic moments of the domain wall, the wall speeds up 11,14 . In Figure 4 we show the increase in speed as external fields of 50 Oe and 100 Oe are applied perpendicular to the driving field.…”

Section: Motionmentioning

confidence: 99%

Injecting, controlling, and storing magnetic domain walls in ferromagnetic nanowires

2010

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Domain walls in ferromagnetic nanowires are important for proposed devices in recording, logic, and sensing. The realization of such devices depends in part on the ability to quickly and accurately control the domain wall from creation until placement. Using micromagnetic computer simulation we demonstrate how a combination of externally applied magnetic fields is used to quickly inject, move, and accurately place multiple domain walls within a single wire for potential recording and logical operations. The use of a magnetic field component applied perpendicular to the principle domain wall driving field is found to be critical for increased speed and reliability. The effects of the transverse field on the injection and trapping of the domain wall will be shown to be of particular importance.

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Enhancing domain wall speed in nanowires with transverse magnetic fields

Cited by 60 publications

References 11 publications

Antivortex dynamics in magnetic nanostripes

Antivortex dynamics in magnetic nanostripes

Statics and field-driven dynamics of transverse domain walls in biaxial nanowires under uniform transverse magnetic fields

Injecting, controlling, and storing magnetic domain walls in ferromagnetic nanowires

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