Supercurrent-induced domain wall motion

Sacramento, P. D.; Silva, L. C. Fernandes; Nunes, Guilherme S.; Araújo, M. A. N.; Vieira, V. R.

doi:10.1103/physrevb.83.054403

Cited by 7 publications

(5 citation statements)

References 51 publications

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“…This is evidence of DW deformation due to interaction with the pinning site. The DW deformation and the occurrence of z component exhibited in this study are in good agreement with the recent experimental and theoretical studies [24][25][26].…”

Section: A Time Evolution Of Magnetization and Spin Torquesupporting

confidence: 92%

“…The DW displacement is monitored by observing the shift of the DW center from the initial position at each time step. It can be seen that the DW displacement is time dependent and increases linearly in the first time period before reaching a steady state with finite displacement due to the interaction with the boundary pinning sites [24,27,28]. The equilibration time of DW displacement tends to decrease with increasing spin current density, consistent with the increased DW velocity.…”

Section: B Dw Displacement and Velocitymentioning

confidence: 64%

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Influence of uniaxial anisotropy on domain wall motion driven by spin torque

et al. 2015

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Magnetization dynamics of a bilayer structure in the presence of a spin-transfer torque is studied using an atomistic model coupled with a model of spin accumulation. The spin-transfer torque is decomposed into two components: adiabatic and nonadiabatic torques, expressed in terms of the spin accumulation, which is introduced into the atomistic model as an additional field. The evolution of the magnetization and the spin accumulation are calculated self-consistently. We introduce a spin-polarized current into a material containing a domain wall whose width is varied by changing the anisotropy constant. It is found that the adiabatic spin torque tends to develop in the direction of the magnetization whereas the nonadiabatic spin torque arising from the mistracking of conduction electrons and local magnetization results in out-of-plane magnetization components. However, the adiabatic spin torque significantly dominates the dynamics of the magnetization. The total spin-transfer torque acting on the magnetization increases with the anisotropy constant due to the increasing magnetization gradient.

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Section: A Time Evolution Of Magnetization and Spin Torquesupporting

confidence: 92%

Section: B Dw Displacement and Velocitymentioning

confidence: 64%

Influence of uniaxial anisotropy on domain wall motion driven by spin torque

et al. 2015

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“…Furthermore, the influence of superconductivity on spin-pumping effects have been theoretically investigated both in Josephson junctions [90] and in SF bilayers [91]. Other works have discussed spin dynamics in Josephson junctions [92] and the possibility of using spin-polarized supercurrents to induce magnetic domain wall motion [93][94][95]. Magnetic domain wall motion is a major research theme in spintronics as it can offer an alternative way to transmit and store information in a non-volatile way.…”

Section: Triplet Cooper Pairs and Magnetization Dynamicsmentioning

confidence: 99%

Superconducting spintronics

2015

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Traditional studies that combine spintronics and superconductivity have mainly focused on the injection of spin-polarized quasiparticles into superconducting materials. However, a complete synergy between superconducting and magnetic orders turns out to be possible through the creation of spin-triplet Cooper pairs, which are generated at carefully engineered superconductor interfaces with ferromagnetic materials. Currently, there is intense activity focused on identifying materials combinations that merge superconductivity and spintronics to enhance device functionality and performance. The results look promising: it has been shown, for example, that superconducting order can greatly enhance central effects in spintronics such as spin injection and magnetoresistance. Here, we review the experimental and theoretical advances in this field and provide an outlook for upcoming challenges in superconducting spintronics.At the interface between materials with radically different properties, new physical phenomena can emerge. A classical example of such an interface is that between a superconductor and a ferromagnet where the opposing electron orders destructively interfere; however, it turns out that under the right conditions at a superconductorferromagnet interface both superconductivity and spin-polarization can unite to create a new superconducting state that offers tantalizing possibilities for spin transport in which Joule heating and dissipation are minimized.Spintronics offers the potential for creating circuits in which logic operations controlled by spin currents can be performed faster and more energy efficient [1] than the charge-based equivalent in semiconductor transistor technologies. Spintronics is one of the most active areas of research and while it offers control of spin and charge at the nanometer scale, it has also found sensory applications in hard disk drive read heads via the giant magnetoresistance effect [2,3]. The idea of combining superconductivity with spintronics has historically focused on the net spin-polarization of quasiparticles in superconductors. It is interesting to note that the first spin transport experiments [4-6] involved ferromagnet-superconductor bilayers and predated non-superconducting spin transport experiments [8]. As will be discussed in this review, it is possible to create pseudo-chargeless spin-1/2 excitations in superconductors [7] which have extremely long spin lifetimes.Recently, a more complete synergy between superconductivity and spintronics has been made possible through the discovery of spin-triplet Cooper pairs at superconductor-ferromagnet interfaces. Non-superconducting spin currents are generated by passing charge currents through ferromagnetic materials. As will be explained in this review, spin currents can also be generated by passing supercurrents through ferromagnetic materials. Charge flow within superconductors is carried by Cooper pairs which consist of interacting pairs of electrons [9]. The idea of combining superconducting and magnetic order wa...

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“…The equal-spin pair correlations are long range and can extensively propagate in materials with uniform magnetization and strong scattering resources [1][2][3]6 . This long range nature of spinpolarized superconducting correlations has turned the ESPs to a highly attractive perspective in nanoscale spintronics 3,[7][8][9][10][11][12][13] . Another source to generate the ESPs is a combination of spin orbit interactions and uniform Zeeman field proximitized to a superconducting electrode [16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene

2016

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We theoretically study scattering process and superconducting triplet correlations in a graphene junction comprised of ferromagnet-RSO-superconductor in which RSO stands for a region with Rashba spin orbit interaction. Our results reveal spin-polarized subgap transport through the system due to an anomalous equal-spin Andreev reflection in addition to conventional back scatterings. We calculate equal-and opposite-spin pair correlations near the F-RSO interface and demonstrate direct link of the anomalous Andreev reflection and equal-spin pairings arised due to the proximity effect in the presence of RSO interaction. Moreover, we show that the amplitude of anomalous Andreev reflection, and thus the triplet pairings, are experimentally controllable when incorporating the influences of both tunable strain and Fermi level in the nonsuperconducting region. Our findings can be confirmed by a conductance spectroscopy experiment and provide better insights into the proximity-induced RSO coupling in graphene layers reported in recent experiments 30,31,33,34.

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Supercurrent-induced domain wall motion

Cited by 7 publications

References 51 publications

Influence of uniaxial anisotropy on domain wall motion driven by spin torque

Influence of uniaxial anisotropy on domain wall motion driven by spin torque

Superconducting spintronics

Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene

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