Synchronous precessional motion of multiple domain walls in a ferromagnetic nanowire by perpendicular field pulses

Kim, June-Seo; Mawass, Mohamad‐Assaad; Bisig, André; Krüger, Benjamin; Reeve, Robert M.; Schulz, Thorsten; Büttner, Felix; Yoon, Jung Won; You, Chun‐Yeol; Weigand, Markus; Stoll, Hermann; Schütz, Gisela; Swagten, H.J.M.; Koopmans, B.; Eisebitt, Stefan; Kläui, Mathias

doi:10.1038/ncomms4429

Cited by 68 publications

(38 citation statements)

References 42 publications

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“…In particular, the promising concept of "race-track memory" [1,3] demands a well controlled motion of the DW along a nanowire. In this context, several works have studied the controlled displacement of DWs in stripes [4][5][6][7][8][9] and cylindrical wires [10][11][12]. Such studies have revealed that geometry plays a fundamental role in the DW dynamics.…”

Section: Introductionmentioning

confidence: 99%

Oscillatory behavior of the domain wall dynamics in a curved cylindrical magnetic nanowire

et al. 2017

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Understanding the domain wall dynamics is an important issue in modern magnetism. Here we present results of domain wall displacement in curved cylindrical nanowires at a constant magnetic field. We show that the average velocity of a transverse domain wall increases with curvature. Contrary to what it is observed in stripes, in a curved wire the transverse domain wall oscillates along and rotates around the nanowire with the same frequency. These results open the possibility of new oscillation-based applications.

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Section: Introductionmentioning

confidence: 99%

Oscillatory behavior of the domain wall dynamics in a curved cylindrical magnetic nanowire

et al. 2017

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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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“…Although DWs in soft-ferromagnetic nanowires can be propagated at modest applied fields $10 Oe, 3 neighbouring DWs travel in opposite directions, making synchronous data transport impossible unless complex "ratcheted" nanowires 4,5 or field pulses with intricate spatial 6 or temporal profiles 7 are employed. Moving DWs via spin-torque effects is a more attractive approach, since neighbouring DWs travel uni-directionally.…”

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confidence: 99%

A sound idea: Manipulating domain walls in magnetic nanowires using surface acoustic waves

Dean

Bryan

Cooper

et al. 2015

Applied Physics Letters

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We propose a method of pinning and propagating domain walls in artificial multiferroic nanowires using electrically induced surface acoustic waves. Using finite-element micromagnetic simulations and 1D semi-analytical modelling, we demonstrate how a pair of interdigitated acoustic transducers can remotely induce an array of attractive domain wall pinning sites by forming a standing stress/strain wave along a nanowire's length. Shifts in the frequencies of the surface acoustic waves allow multiple domain walls to be synchronously transported at speeds up to 50 ms À1 . Our study lays the foundation for energy-efficient domain wall devices that exploit the low propagation losses of surface acoustic waves to precisely manipulate large numbers of data bits. V C 2015 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4932057] Domain walls (DWs) in magnetic nanowires 1 have great technological potential through the development of "racetrack" memory devices. 2 In these devices, DWs separate magnetically bi-stable domains, the orientations of which represent binary data. Synchronously moving the DWs transports data along the nanowires, thus facilitating read/write operations.A major challenge in the development of racetrack memory has been finding efficient methods of transporting DWs. Although DWs in soft-ferromagnetic nanowires can be propagated at modest applied fields $10 Oe, 3 neighbouring DWs travel in opposite directions, making synchronous data transport impossible unless complex "ratcheted" nanowires 4,5 or field pulses with intricate spatial 6 or temporal profiles 7 are employed. Moving DWs via spin-torque effects is a more attractive approach, since neighbouring DWs travel uni-directionally. However, current-induced DW transport is inefficient and unreliable in soft ferromagnetic systems, 8,9 with complex multilayer nanowires exploiting spin-orbit effects [10][11][12] or containing antiferromagnetically coupled layers 13 being required to obtain fast and reliable DW motion at typical experimental current densities.Previously, we have shown that artificial multiferroic systems, where magnetostrictive nanowires are coupled to electrically contacted piezoelectric layers, offer alternative routes to obtaining synchronous DW motion. 14 In this approach, electrically induced strains in the piezoelectric layer produce local variations in the nanowire's magnetic anisotropy by the Villari effect. These can then be utilized to both pin and synchronously propagate DWs. The approach is attractive because it is voltage rather current driven, and thus is expected to be power efficient. Furthermore, in contrast to both field-and current-induced approaches, where interactions are impulse-based, in the multiferroic approach DWs are constantly confined within a stress-induced potential well, offering precise control of the DWs' positioning. However, the necessity of fabricating arrays of electrical contacts makes for complex device designs when compared to the simple, two-terminal configurations required for current-induced motion...

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Synchronous precessional motion of multiple domain walls in a ferromagnetic nanowire by perpendicular field pulses

Cited by 68 publications

References 42 publications

Oscillatory behavior of the domain wall dynamics in a curved cylindrical magnetic nanowire

Oscillatory behavior of the domain wall dynamics in a curved cylindrical magnetic nanowire

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

A sound idea: Manipulating domain walls in magnetic nanowires using surface acoustic waves

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