Gold shunt pads as a chirality filter for current-driven 360° domain wall motion in a ferromagnetic wire

Zhang, Jinshuo; Ross, Caroline A.

doi:10.1063/1.4825264

Cited by 6 publications

(6 citation statements)

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“…Moreover, instead of Walker Breakdown as observed in 180DWs, a 360DW is predicted to undergo annihilation at a sufficiently high spin current density. Simulations predict that 360DWs of different chirality can be filtered [16], and 360DWs have been proposed for use in magnetic sensors [17] and as an alternative to 180DWs in memory and logic.…”

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confidence: 99%

360° domain walls: stability, magnetic field and electric current effects

Zhang

Siddiqui

et al. 2016

New J. Phys.

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The formation of 360°magnetic domain walls (360DWs) in Co and Ni 80 Fe 20 thin film wires was demonstrated experimentally for different wire widths, by successively injecting two 180°domain walls (180DWs) into the wire. For narrow wires (50 nm wide for Co), edge roughness prevented the combination of the 180DWs into a 360DW, and for wide wires (200 nm for Co) the 360DW was unstable and annihilated spontaneously, but over an intermediate range of wire widths, reproducible 360DW formation occurred. The annihilation and dissociation of 360DWs was demonstrated by applying a magnetic field parallel to the wire, showing that annihilation fields were several times higher than dissociation fields in agreement with micromagnetic modeling. The annihilation of a 360DW by current pulsing was demonstrated.

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confidence: 99%

360° domain walls: stability, magnetic field and electric current effects

Zhang

Siddiqui

et al. 2016

New J. Phys.

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“…[34,35]. Within the steady motion regime, we found that the DW velocity is V DW (t) = u(t) × β α for the NWs, where u is the spin current velocity inside the nanowire [11].…”

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confidence: 88%

“…Nearby 180DWs in a wire can interact via their stray fields, annihilating spontaneously or forming a 360° domain wall (360DW), depending on their type (VW or TW), their relative chirality and the geometry of the wire [10]. 360DWs have distinct behaviors compared to 180DWs under the influence of current and magnetic field [11][12][13][14][15][16][17] and their formation is therefore important in DW devices in which the walls are close enough to interact, playing a key role in device performance, including speed, capacity and reliability.…”

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Domain Wall Configurations and Interactions in Nanowires With Perpendicular Magnetic Anisotropy

Zhang

Ross

2016

IEEE Magn. Lett.

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Magnetic thin film wires with perpendicular magnetic anisotropy (PMA) containing domain walls (DWs) have been proposed for magnetic logic and memory devices. Using micromagnetic simulations, the magnetic configuration of a DW as a function of the magnitude of the PMA, wire width and thickness is described, showing the regimes of stability of Bloch and Néel walls. Stray field leads to repulsive interactions preventing the formation of 360 degree DWs, and promote uniform spacing between multiple DWs confined within a nanowire. Introduction:

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“…Ferromagnetic domain walls (DWs) in thin film wires can be translated by an electric current using spin torque transfer effects [Berger 1978, Tatara 2004, Thiaville 2007, Beach 2008, Zhang 2013] making them promising for applications in memory [Parkin 2008] and logic [Currivan 2012, Allwood 2005] devices, and spurring intense interest in their structure and behavior. In a thin film wire made from a low anisotropy ferromagnet such as Permalloy (Ni 80 Fe 20 ), the domain wall can adopt a transverse wall (TW) or vortex wall (VW) configuration depending on the wire width and thickness, according to both simulations and experimental observations [McMichael 1997, Kläui 2004].…”

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confidence: 99%

Effects of Edge Taper on Domain Wall Structure and Current-Driven Walker Breakdown in a Ferromagnetic Thin Film Wire

et al. 2015

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Domain walls in a ferromagnetic thin film wire with rectangular cross section adopt transverse wall (TW) or vortex wall (VW) geometries depending on the magnetic material and the wire width and thickness. However, experimentally wires can have a trapezoidal cross section if they are made by liftoff using an undercut resist profile. Micromagnetic modeling shows that tapering of the wire not only promotes the formation of a TW over a VW, but also increases the critical current value and the domain wall velocity at which Walker breakdown occurs, providing a potential route to higher speed domain wall devices.

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Gold shunt pads as a chirality filter for current-driven 360° domain wall motion in a ferromagnetic wire

Abstract: Articles you may be interested inFaster motion of double 360° domain walls system induced by spin-polarized current

Cited by 6 publications

References 30 publications

360° domain walls: stability, magnetic field and electric current effects

360° domain walls: stability, magnetic field and electric current effects

Domain Wall Configurations and Interactions in Nanowires With Perpendicular Magnetic Anisotropy

Effects of Edge Taper on Domain Wall Structure and Current-Driven Walker Breakdown in a Ferromagnetic Thin Film Wire

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