Introduction

Baryakhtar, V. G.; Chetkin, M. V.; Иванов, Б. А.; Gadetskii, Sergei N.

doi:10.1007/bfb0045994

Cited by 26 publications

(60 citation statements)

References 5 publications

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“…The dynamics of the motion of domain walls (DWs) in magnetic materials has been extensively explored theoretically [1][2][3] . Depending on the driving force, conventionally magnetic field and, more recently, spin-polarized current [4][5][6][7][8][9][10][11][12][13] , the propagation of DWs changes from a simple translation to more complex precessional modes 14 .…”

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confidence: 99%

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Direct observation of the coherent precession of magnetic domain walls propagating along permalloy nanowires

et al. 2006

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The dynamics of the motion of domain walls (DWs) in magnetic materials has been extensively explored theoretically 1-3 . Depending on the driving force, conventionally magnetic field and, more recently, spin-polarized current 4-13 , the propagation of DWs changes from a simple translation to more complex precessional modes 14 . Experimentally, indirect evidence of this transition is found from a sudden drop in the wall's velocity [15][16][17][18] , but direct observation of the precessional modes is lacking. Here we show experimentally, using a combination of quasi-static and real-time measurement techniques, that DWs propagate along permalloy nanowires with a periodic variation in the chirality of the walls. The frequency of this oscillation is consistent with a precession of the propagating DW, increasing linearly with field according to the Larmor precession frequency. Current in the nanowire, large enough to significantly influence the DW velocity 18,19 , has little effect on the precession frequency but can be used to adjust the phase of the wall's precession. The highly coherent and reproducible motion of the DW revealed by our studies demonstrates that the DW is a well-defined macroscopic object whose phase is inextricably interlinked to the distance travelled by the DW.With the advent of magnetic nanowires of dimensions comparable to magnetic DW widths, it is possible to imagine that DWs propagating along such wires will exhibit a well-defined precessional mode due to confinement. In contrast, in extended structures, which have been extensively studied in the past, many modes are accessible 1,20 . Permalloy nanowires are attractive because they exhibit large anisotropic magnetoresistance (AMR) so that transverse and vortex walls can be readily detected and identified by resistance measurements. Furthermore, by breaking the onedimensional symmetry of the nanowire with a notch along one of its edges, the chirality of the DW can also be discerned 21 . Here, notched nanowires are used to directly show that the chirality of transverse DWs periodically reverses as the walls propagate in the precessional regime. This precessional motion is also detected in real time using time-resolved resistance measurements, which show that the precessional motion is, surprisingly, highly coherent.A scanning electron microscopy image of a typical permalloy nanowire with two contact lines, labelled A and B, is shown in Fig. 1a. Using a suitable field sequence (see the Methods section), a DW is introduced into section A-B of the nanowire by injecting a voltage pulse into contact line A. A magnetic field, H, is applied along the wire during the voltage pulse injection to assist the subsequent propagation of a DW. A fraction of the injected voltage pulse flows into section A-B, thereby injecting current into the nanowire as the DW propagates along it. The current density that flows into the nanowire scales as ∼0.5 × 10 8 A cm −2 V −1 . Positive current is defined as current flowing from line A to B.The existence of a DW in sectio...

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confidence: 99%

“…Finally, it is interesting to compare f D with the oscillation frequency calculated using the well-known one-dimensional model of DW motion 1,2,22 . This frequency, in the absence of current, is given by…”

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Direct observation of the coherent precession of magnetic domain walls propagating along permalloy nanowires

et al. 2006

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“…Equation (11) embodies the "slave" approximation to the magnetization 45,47 in which the antiferromagnetic moment dynamics is well approximated via damped harmonic motion-the so-called pendulum approach.…”

Section: Coupled-spin Dynamicsmentioning

confidence: 99%

Dynamics of laser-induced spin reorientation in Co/SmFeO3heterostructure

et al. 2013

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Ultrafast control of a ferromagnet (FM) via exchange coupling with an antiferromagnet (AFM) is demonstrated in a Co/SmFeO 3 heterostructure. Employing time-resolved photoemission electron microscopy combined with x-ray magnetic circular dichroism, a sub-100-ps change of the Co spins orientation by up to 10 • driven by the ultrafast heating of the SmFeO 3 orthoferrite substrate through its spin reorientation phase transition is revealed. Numerical modeling of the ultrafast-laser-induced heat profile in the heterostructure, and the subsequent coupled spins dynamics and equilibration of the spin systems suggest that the localized laser-induced spin reorientation is hindered compared with the static case. Moreover, numerical simulations show that a relatively small Co/SmFeO 3 exchange interaction could be sufficient to induce a complete and fast spin reorientation transition (SRT).

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“…The relevance of the σ model became apparent through standard hydrodynamic approaches [10][11][12] but detailed applications to soliton dynamics were carried out mostly in the Soviet literature reviewed in part in ref. [13]. We were thus sufficiently motivated to extend the preceding analysis to the case of layered or 2D antiferromagnets whose significance has increased in recent years in connection with high-T c superconductivity.…”

Section: Antiferromagnetsmentioning

confidence: 99%

“…(3), while the corresponding conservation laws are again given by eqs. (12) and (13). The associated total vorticity reads…”

Section: Superfluidsmentioning

confidence: 99%

Dynamics of Topological Magnetic Solitons

Baryakhtar¹,

Chetkin²,

Иванов³

et al. 1994

Springer Tracts in Modern Physics

159

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A direct link between the topological complexity of magnetic media and their dynamics is established through the construction of unambiguous conservation laws for the linear and angular momenta as moments of a topological vorticity. As a consequence, the dynamics of topological magnetic solitons is shown to exhibit the characteristic features of the Hall effect of electrodynamics or the Magnus effect of fluid dynamics. The main points of this program are reviewed here for both ferromagnets and antiferromagnets, while a straightforward extension to the study of superfluids is also discussed briefly.

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Introduction

Cited by 26 publications

References 5 publications

Direct observation of the coherent precession of magnetic domain walls propagating along permalloy nanowires

Direct observation of the coherent precession of magnetic domain walls propagating along permalloy nanowires

Dynamics of laser-induced spin reorientation in Co/SmFeO3heterostructure

Dynamics of Topological Magnetic Solitons

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