Current-Excited Magnetization Dynamics in Narrow Ferromagnetic Wires

Togawa, Yoshihiko; Kimura, Takashi; Harada, Ken; Akashi, Takumi; Matsuda, Tsuyoshi; Tonomura, Akira; Otani, Y.

doi:10.1143/jjap.45.l683

Cited by 56 publications

(40 citation statements)

References 32 publications

(52 reference statements)

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“…Extensive experimental [1][2][3] and theoretical 4,5 studies have shown that a current on the order of 10 5 -10 8 A cm − 2 is capable of moving the conventional MDW or magnetic vortex in ferromagnetic (FM) nanostructures. However, such high current densities should induce the intense joule heating, which is detrimental for practical applications.…”

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confidence: 99%

Skyrmion flow near room temperature in an ultralow current density

et al. 2012

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The manipulation of spin textures with electric currents is an important challenge in the field of spintronics. many attempts have been made to electrically drive magnetic domain walls in ferromagnets, yet the necessary current density remains quite high (~10 7 A cm − 2 ). A recent neutron study combining Hall effect measurements has shown that an ultralow current density of J~10 2 A cm − 2 can trigger the rotational and translational motion of the skyrmion lattice in mnsi, a helimagnet, within a narrow temperature range. Raising the temperature range in which skyrmions are stable and reducing the current required to drive them are therefore desirable objectives. Here we demonstrate near-room-temperature motion of skyrmions driven by electrical currents in a microdevice composed of the helimagnet FeGe, by using in-situ Lorentz transmission electron microscopy. The rotational and translational motions of skyrmion crystal begin under critical current densities far below 100 A cm − 2 .

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Skyrmion flow near room temperature in an ultralow current density

et al. 2012

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“…Current-induced DW motion is of particular interest because it enables the position of DW to be controlled electrically without applying an external magnetic field [1][2][3][4][7][8][9][10][11][12][13][14][16][17][18][19][20][21] . The electric field effect on magnetic materials has been actively studied recently, because magnetic properties can be controlled electrically [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] , when a field-effect-device structurethat is, one consisting of a top-gate electrode, a dielectric insulator layer (or a liquid electrolyte), and a ferromagnetic layer-is used to modulate a carrier density.…”

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Electric-field control of magnetic domain-wall velocity in ultrathin cobalt with perpendicular magnetization

et al. 2012

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Controlling the displacement of a magnetic domain wall is potentially useful for information processing in magnetic non-volatile memories and logic devices. A magnetic domain wall can be moved by applying an external magnetic field and/or electric current, and its velocity depends on their magnitudes. Here we show that the applying an electric field can change the velocity of a magnetic domain wall significantly. A field-effect device, consisting of a topgate electrode, a dielectric insulator layer, and a wire-shaped ferromagnetic Co/Pt thin layer with perpendicular anisotropy, was used to observe it in a finite magnetic field. We found that the application of the electric fields in the range of ± 2-3 mV cm − 1 can change the magnetic domain wall velocity in its creep regime (10 6 -10 3 m s − 1 ) by more than an order of magnitude. This significant change is due to electrical modulation of the energy barrier for the magnetic domain wall motion.

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“…It has been demonstrated that domain walls can be moved not only by a magnetic field but also by an electric current [4,[6][7][8][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Since novel applications based on the domain wall motion have been proposed [25][26][27][28], the study of dynamics of a magnetic domain wall in a magnetic nanowire is of importance not only from the viewpoints of exciting fundamental physics but also from technological points of view.…”

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Dynamical Pinning of a Domain Wall in a Magnetic Nanowire Induced by Walker Breakdown

et al. 2008

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Transmission probability of a domain wall through a magnetic nanowire is investigated as a function of the external magnetic field. Very intriguing phenomenon is found that the transmission probability shows a significant drop after exceeding the threshold driving field, which contradicts our intuition that a domain wall is more mobile in the higher magnetic field. The micromagnetics simulation reveals that the domain wall motion in the wire with finite roughness causes the dynamical pinning due to the Walker breakdown, which semi-quantitatively explains our experimental results.

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Current-Excited Magnetization Dynamics in Narrow Ferromagnetic Wires

Cited by 56 publications

References 32 publications

Skyrmion flow near room temperature in an ultralow current density

Skyrmion flow near room temperature in an ultralow current density

Electric-field control of magnetic domain-wall velocity in ultrathin cobalt with perpendicular magnetization

Dynamical Pinning of a Domain Wall in a Magnetic Nanowire Induced by Walker Breakdown

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