Current-induced magnetization reversal in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Cu</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Co</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Au</mml:mi></mml:mrow></mml:math>notched mesoscopic bars

Morecroft, D.; Colin, I. A.; Castaño, Fernando; Bland, J. A. C.; Ross, Caroline A.

doi:10.1103/physrevb.76.054449

Cited by 11 publications

(9 citation statements)

References 40 publications

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“…Clear changes in the XMCD contrast during the application of a current pulse revealed that the NiFe magnetization tilts by a relatively large angle in the direction transverse to the nanowires. Even if the Oersted field is not specific to SV nanowires, 52 its impact is increased in such devices because of its opposite action on the Co and the NiFe magnetizations. In particular, the dipolar interaction tends to amplify the opposite magnetization tilts initiated in NiFe and Co layers by the Oersted field.…”

Section: Discussionmentioning

confidence: 99%

Current-induced motion and pinning of domain walls in spin-valve nanowires studied by XMCD-PEEM

et al. 2010

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International audienceVery large average velocities, up to 600 m/s, have been found for domain-wall motion driven by 3-ns-long pulses of electric current in zero magnetic field in the NiFe layer of 200-nm-wide NiFe/Cu/Co nanowires. For longer pulses, the domain-wall motion is strongly hindered by pinning potentials. Dipolar interactions between the NiFe and Co layers caused by anisotropy inhomogeneities have been identified as the most important among the different potential sources of DW pinning. The domain-wall velocities increase with current density, but a substantial drop is observed at current densities above 4×10^11 A/m

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Section: Discussionmentioning

confidence: 99%

Current-induced motion and pinning of domain walls in spin-valve nanowires studied by XMCD-PEEM

et al. 2010

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“…For instance, it was shown that the contribution of the Oersted field and not only STT is needed to explain the magnetization reversal in trilayered pillars induced by a current flowing perpendicular to the plane of the layers. 4,5 For in-plane currents, H Oe has been invoked to explain magnetization reversal in mesoscopic NiFe/Cu/Co/Au bars 6 and the resonant depinning of constricted domain walls (DWs) in NiFe/Cu/Co trilayers. 7 Several studies on the effects of current pulses on the magnetization of nanostripes, mainly concerning currentinduced domain-wall motion (CIDM), have been based on the observation of the domain structure before and after the application of a current pulse.…”

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confidence: 99%

Direct observation of Oersted-field-induced magnetization dynamics in magnetic nanostripes

et al. 2011

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We have used time-resolved x-ray photoemission electron microscopy to investigate the magnetization dynamics induced by nanosecond current pulses in NiFe/Cu/Co nanostripes. A large tilt of the NiFe magnetization in the direction transverse to the stripe is observed during the pulses. We show that this effect cannot be quantitatively understood from the amplitude of the Oersted field and the shape anisotropy. High-frequency oscillations observed at the onset of the pulses are attributed to precessional motion of the NiFe magnetization about the effective field. We discuss the possible origins of the large magnetization tilt and the potential implications of the static and dynamic effects of the Oersted field on current-induced domain-wall motion in such stripes. The possibility of manipulating the magnetic configuration of nanostructures by using electrical currents is a recent, exciting development in spintronics. Electrical currents can affect the magnetization of magnetic nanostructures through both the charge and the spin of the conduction electrons. In recent years it has been shown that spin-transfer torque (STT) 1,2 and Rashba spin-orbit torque effects 3 act on the magnetization, in addition to the classical Oersted magnetic field H Oe . In general, the combination of these effects should be taken into account in the description of the magnetization dynamics during the application of a current pulse. For instance, it was shown that the contribution of the Oersted field and not only STT is needed to explain the magnetization reversal in trilayered pillars induced by a current flowing perpendicular to the plane of the layers.4,5 For in-plane currents, H Oe has been invoked to explain magnetization reversal in mesoscopic NiFe/Cu/Co/Au bars 6 and the resonant depinning of constricted domain walls (DWs) in NiFe/Cu/Co trilayers. 7Several studies on the effects of current pulses on the magnetization of nanostripes, mainly concerning currentinduced domain-wall motion (CIDM), have been based on the observation of the domain structure before and after the application of a current pulse. 8,9 However, the effect of the Oersted field on the magnetization can only be investigated by direct, dynamic observations during the current pulses. This has been achieved in this work, using time-resolved x-ray magnetic circular dichroism combined with photoemission electron microscopy (XMCD-PEEM). Our results show that the current-induced field during nanosecond pulses causes both quasistatic and precessional effects on the NiFe magnetization. These effects may contribute to the increased efficiency of current-induced domain-wall motion observed in such trilayers. 10-12Stacks of Cu(2 nm)/Ni 80 Fe 20 (5 nm)/Cu(5 nm)/Co(5 nm)/ CoO(6 nm) deposited on highly resistive Si(100) (ρ > 300 cm) were patterned in 400-nm-wide zigzag stripes, with angles of 90• and 13-μm-long straight sections, combining electron-beam lithography and ion-beam etching. Contact electrodes made of Ti/Au were subsequently deposited using evaporation and a lift-off...

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“…Above this threshold the profile of the magnetization is no longer rigid and there is a nucleation of more complex DWs such as vortex or antivortex walls. An important aspect in the study of the interaction of current and magnetization is the limited impact of the Oersted field produced by the current in long magnetic stripes [23,[41][42][43], compared to wider geometries such as magnetic disks [44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Steady motion of skyrmions and domains walls under diffusive spin torques

2017

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We explore the role of the spin diffusion of conducting electrons in two-dimensional magnetic textures (domain walls and skyrmions) with spatial variation of the order of the spin precession length λ ex . The effect of diffusion reflects in four additional torques that are third order in spatial derivatives of magnetization and bilinear in λ ex and in the nonadiabatic parameter β . In order to study the dynamics of the solitons when these diffusive torques are present, we derive the Thiele equation in the limit of steady motion and we compare the results with the nondiffusive limit. When considering a homogenous current these torques increase the longitudinal velocity of transverse domain walls of width by a factor (λ ex / ) 2 (α/3), α being the magnetic damping constant. In the case of single skyrmions with core radius r 0 these new contributions tend to increase the Magnus effect in an amount proportional to (λ ex /r 0 ) 2 (1 + 2αβ ).

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Current-induced magnetization reversal inNiFe∕Cu∕Co∕Aunotched mesoscopic bars

Cited by 11 publications

References 40 publications

Current-induced motion and pinning of domain walls in spin-valve nanowires studied by XMCD-PEEM

Current-induced motion and pinning of domain walls in spin-valve nanowires studied by XMCD-PEEM

Direct observation of Oersted-field-induced magnetization dynamics in magnetic nanostripes

Steady motion of skyrmions and domains walls under diffusive spin torques

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