Domain-Wall Statics

Malozemoff, A. P.; Slonczewski, J. C.

doi:10.1016/b978-0-12-002951-8.50008-x

Cited by 82 publications

(173 citation statements)

References 0 publications

Supporting

Mentioning

168

Contrasting

Order By: Relevance

“…Notice also that for B ext such that the VW has transformed into a TW for ∆ z = 10 nm, the TW velocity for a given B ext exceeds the corresponding VW velocity in the system with ∆ z = 20 nm. This is likely due to the large energy dissipation associated with the dynamics of the vortex core 48 .…”

Section: A Vortex Wall Dynamics In Narrow Stripsmentioning

confidence: 99%

“…Contrary to the static case where the polarity barely contributes to the energy of the equilibrium state 26 , in the dynamics it plays an important role. This is because when an external field is applied, the vortex core feels a gyrotropic force 48 F g = pG z×v, that depends on the polarity; G = 2πJt is the gyrotropic constant and v the velocity. In the case of a VW this force tries to expel the vortex out through the top or bottom edge depending on the polarity, and independently of the vortex chirality.…”

Section: Double Vortex Wall Dynamicsmentioning

confidence: 99%

“…In the case of ∆ z = 10 nm, for very small fields v increases linearly with B ext , a behavior arising from steady VW motion with the vortex core assuming an off-centre position within the strip 10 . For B ext ≥ 0.4 mT the vortex core is expelled out of the strip due to the gyrotropic force 48 , leading to a TW, and to a sub-linear v(B ext ) relation 10 . In contrast, for the thicker strip with ∆ z = 20 nm, the linear dependence of v on B ext , originating from steady VW dynamics with the vortex core within the strip, persists up to the Walker field.…”

Section: A Vortex Wall Dynamics In Narrow Stripsmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic domain-wall dynamics in wide permalloy strips

Estévez

Laurson

2016

Phys. Rev. B

View full text Add to dashboard Cite

Domain walls in soft permalloy strips may exhibit various equilibrium micromagnetic structures depending on the width and thickness of the strip, ranging from the well-known transverse and vortex walls in narrow and thin strips to double and triple vortex walls recently reported in wider strips [V. Estévez and L. Laurson, Phys. Rev. B 91, 054407 (2015)]. Here we analyze the field driven dynamics of such domain walls in permalloy strips of widths from 240 nm up to 6 µm, using the known equilibrium domain wall structures as initial configurations. Our micromagnetic simulations show that the domain wall dynamics in wide strips is very complex, and depends strongly on the geometry of the system, as well as on the magnitude of the driving field. We discuss in detail the rich variety of the dynamical behaviors found, including dynamic transitions between different domain wall structures, periodic dynamics of a vortex core close to the strip edge, transitions towards simpler domain wall structures of the multi-vortex domain walls controlled by vortex polarity, and the fact that for some combinations of the strip geometry and the driving field the system cannot support a compact domain wall.

show abstract

Section: A Vortex Wall Dynamics In Narrow Stripsmentioning

confidence: 99%

Section: Double Vortex Wall Dynamicsmentioning

confidence: 99%

Section: A Vortex Wall Dynamics In Narrow Stripsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic domain-wall dynamics in wide permalloy strips

Estévez

Laurson

2016

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The structure of the magnetisation in the vicinity of the singularities is plotted in Figures 3c,d. The vorticity sink (Figure 3e), whose surrounding magnetisation is plotted in Figure 3c, corresponds to a contracirculating Bloch point 29 (or anti-Bloch point) with Skyrmion number −1. The vorticity source (Figure 3f), has a magnetisation structure (Figure 3d) corresponding to that of a circulating Bloch point 29 with Skyrmion number +1.…”

mentioning

confidence: 99%

“…Instead, the loop consists of two halves connected by the Bloch points, which locally leads to a reversal of the vorticity along the vortex and the antivortex cores, as seen in Extended Data Figure 4. Second, while singularities often mediate dynamic magnetisation processes and have been predicted during magnetisation dynamics 29,30 as well as during magnetic field reconnection in plasma physics 31 , the observed structures are inherently static. In Ref.…”

mentioning

confidence: 99%

Experimental observation of vortex rings in a bulk magnet

et al. 2020

View full text Add to dashboard Cite

Vortex rings are remarkably stable structures occurring in a large variety of systems: for example in turbulent gases, where they are at the origin of weather phenomena 1 ; in fluids with implications for biology 2 ; in electromagnetic discharges 3 ; and in plasmas 4 . While vortex rings have also been predicted to exist in ferromagnets 5 , they have not yet been observed. Using X-ray magnetic nanotomography 6 , we imaged three-dimensional structures forming closed vortex loops in a bulk micromagnet. The cross-section of these loops consists of a vortex-antivortex pair and, based on magnetic vorticity, a quantity analogous to hydrodynamic vorticity, we identify these configurations as magnetic vortex rings. While such structures have been predicted to exist as transient states in exchange ferromagnets 5 , the

show abstract

Variation of Topology in Magnetic Bubbles in a Colossal Magnetoresistive Manganite

et al. 2016

View full text Add to dashboard Cite

The emergence of zero-bias bubbles (≈100 nm in diameter) with various Bloch lines and their triangular lattice is revealed in a colossal magnetoresistive material, La Sr MnO , by means of Lorentz transmission electron microscopy (LTEM). The magnetization dynamics, and accompanying changes of the topological number of bubbles via the field-driven motion of the Bloch lines, are demonstrated by in situ LTEM observations.

show abstract

Domain-Wall Statics

Cited by 82 publications

References 0 publications

Magnetic domain-wall dynamics in wide permalloy strips

Magnetic domain-wall dynamics in wide permalloy strips

Experimental observation of vortex rings in a bulk magnet

Variation of Topology in Magnetic Bubbles in a Colossal Magnetoresistive Manganite

Contact Info

Product

Resources

About