Spin and charge transport through non-collinear magnetic nanowires

Sedlmayr, Nicholas; Dugaev, V. K.; Berakdar, J.; Vieira, V. R.; Araújo, M. A. N.; Barnaś, J.

doi:10.1016/j.jmmm.2009.09.040

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…12 This tells us the nature of the spin waves in our system. These spin density corrections result in an inter-DW spin torque and RKKY-like interaction, details of which can be found in Sedlmayr et al [12][13][14] . The result for the spin density around the second domain wall at an arbitrarily chosen configuration, θ 0 = π/4, is shown in figure 1.…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…11 An effective RKKY interaction between two domain walls in a wire can be mediated by the current electrons. [12][13][14] The energy profile of this interaction then favours particular alignments and positions of the domain walls. Furthermore any change in the spin density caused by the presence of one domain wall can have an effect on a wall further down the wire, defined in the direction of electron flow.…”

Section: Introductionmentioning

confidence: 99%

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Spin-density waves and domain wall interactions in nanowires

2011

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We investigated how the dynamics of a domain wall are affected by the presence of spin density waves in a ferromagnetic wire. Domain walls and other scattering centres can cause coherent spin density waves to propagate through a wire when a current is applied. In some cases the spin torque due to these scattered electrons can be enhanced such that it is on a par with the exchange and anisotropy energies controlling the shape and dynamics of the domain wall. In such a case we find that the spin density waves enhance the current induced domain wall motion, allowing for domain wall motion with smaller current pulses. Here we consider a system involving two domain walls and focus on how the motion of the second domain wall is modified by the spin density waves caused by the presence of the first domain wall.

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Section: Theoretical Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spin-density waves and domain wall interactions in nanowires

2011

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“…In this case it is clear that the DWs always come in pairs and as such a natural question to ask is how they interact, mediated by the electrons in the system. As a precursor to this question we discuss such interactions, and their effect on the DWs in nanowires 10, 11. This will form the bulk of the results presented in this paper.…”

Section: Introductionmentioning

confidence: 96%

Role of non‐collinear magnetization: From ferromagnetic nanowires to quantum rings

Sedlmayr

Dugaev

Berakdar

2010

Physica Status Solidi (b)

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We consider interaction effects related to a non-uniform magnetization in ferromagnetic nanowires and their possible generalization to nanorings. First we show that the electric current in a ferromagnetic nanowire with more than one domain wall induces an exchange coupling between the walls mediated by the spin-dependent interference of scattered carriers. This interaction reveals a complex behavior as a function of mutual orientations and separation of the domain walls, thus affecting the domain wall dynamics. Then we consider how the theory should be modified in the case of a magnetized quantum ring. In this case the situation is more complicated because the vortex and onion magnetization states in the ring are not truly ferromagnetic.

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Indirect interaction of magnetic domain walls

Sedlmayr

Dugaev

Inglot

et al. 2011

Physica Rapid Research Ltrs

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1 Introduction Magnetic domain walls (DWs) have attracted a lot of attention as important elements of new magnetoelectronic devices [1 -3]. In particular, it was demonstrated recently that they can be used in a new type of memory device (the racetrack memory) effectively controlled by an electric current [4,5]. On the other hand, the DW can be viewed as a kind of local imperfection in an ordered magnetic system, like an impurity or defect. The substantial difference is that DWs can move and therefore they can be relatively easily put into motion by an external field or electric current, and also by an interaction between them.A great amount of theoretical and experimental work was dedicated to studying the resistance of DWs, the current-induced spin torque, the dynamics of DW motion, and other effects related to a single DW strongly coupled to the electron system [3,6,7]. When the density of DWs increases, it is important to include into these considerations the effects of their interaction. It has already been demonstrated [8 -11] that an electric current in a magnetic wire with DWs influences the DW interaction, so that by using a current the DW coupling can be controlled, and the dynamics of strongly coupled DWs can be affected.In this work we consider in detail the indirect exchange coupling between the DWs in equilibrium. Essentially, the analysis of such interaction is the first necessary step to understand the basic mechanisms of DW interactions.

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Spin and charge transport through non-collinear magnetic nanowires

Cited by 4 publications

References 31 publications

Spin-density waves and domain wall interactions in nanowires

Spin-density waves and domain wall interactions in nanowires

Role of non‐collinear magnetization: From ferromagnetic nanowires to quantum rings

Indirect interaction of magnetic domain walls

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