Electrical signature of magnetic domain-wall dynamics

Liu, Y.; Tretiakov, Oleg A.; Abanov, Ar.

doi:10.1103/physrevb.84.052403

Cited by 10 publications

(19 citation statements)

References 27 publications

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“…This function can be either calculated by means of an analytical approximate model, micromagnetic simulations, or can be measured experimentally for a given wire by a method analogous to the one described in Ref. 39.…”

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confidence: 99%

Domain-Wall Dynamics in Translationally Nonivariant Nanowires: Theory and Applications

2012

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We generalize domain-wall dynamics to the case of translationally noninvariant ferromagnetic nanowires. The obtained equations of motion make the description of the domain-wall propagation more realistic by accounting for the variations along the wire, such as disorder or change in the wire shape. We show that the effective equations of motion are very general and do not depend on the model details. As an example of their use, we consider an hourglass-shaped nanostrip in detail. A transverse domain wall is trapped in the middle and has two stable magnetization directions. We study the switching between the two directions by short current pulses. We obtain the exact time dependence of the current pulses required to switch the magnetization with the minimal Ohmic losses per switching. Furthermore, we find how the Ohmic losses per switching depend on the switching time for the optimal current pulse. As a result, we show that as a magnetic memory device this nanodevice may be 10(5) times more energy efficient than the best modern devices.

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Domain-Wall Dynamics in Translationally Nonivariant Nanowires: Theory and Applications

2012

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“…The slope of V d (J) at large J gives A + B. Constant C one can obtain, e.g., from the measurements of the DW electromotive force [10,11] for dc current. DC current.…”

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confidence: 99%

“…One can either directly perform a numerical minimization of Eq. (11) or alternatively try to find the minimization condition for p analytically. We have followed both routes.…”

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Minimization of Ohmic Losses for Domain Wall Motion in a Ferromagnetic Nanowire

2010

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We study current-induced domain-wall motion in a narrow ferromagnetic wire. We propose a way to move domain walls with a resonant time-dependent current which dramatically decreases the Ohmic losses in the wire and allows driving of the domain wall with higher speed without burning the wire. For any domain-wall velocity we find the time dependence of the current needed to minimize the Ohmic losses. Below a critical domain-wall velocity specified by the parameters of the wire the minimal Ohmic losses are achieved by dc current. Furthermore, we identify the wire parameters for which the losses reduction from its dc value is the most dramatic.

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“…These parameters can be measured in real nanowires either through magnetoresistance or through electrical means as shown in Ref. [45].…”

Section: Domain Wall Motion In An Antiferromagnetmentioning

confidence: 99%

Spin texture motion in antiferromagnetic and ferromagnetic nanowires

et al. 2017

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We propose a Hamiltonian dynamics formalism for the current and magnetic field driven dynamics of ferromagnetic and antiferromagnetic domain walls in one dimensional systems. To demonstrate the power of this formalism, we derive Hamilton equations of motion via Poisson brackets based on the Landau-Lifshitz-Gilbert phenomenology, and add dissipative dynamics via the evolution of the energy. We use this approach to study current induced domain wall motion and compute the drift velocity. For the antiferromagnetic case, we show that a nonzero magnetic moment is induced in the domain wall, which indicates that an additional application of a magnetic field would influence the antiferromagnetic domain-wall dynamics. We consider both cases of the magnetic field being parallel and transverse to the N{\'e}el field. Based on this formalism, we predict an orientation switch mechanism for antiferromagnetic domain walls which can be tested with the recently discovered N{\'e}el spin orbit torques.Comment: 7 pages, 3 figure

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Electrical signature of magnetic domain-wall dynamics

Cited by 10 publications

References 27 publications

Domain-Wall Dynamics in Translationally Nonivariant Nanowires: Theory and Applications

Domain-Wall Dynamics in Translationally Nonivariant Nanowires: Theory and Applications

Minimization of Ohmic Losses for Domain Wall Motion in a Ferromagnetic Nanowire

Spin texture motion in antiferromagnetic and ferromagnetic nanowires

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