Fast generation of domain walls with defined chirality in nanowires

Sentker, Kathrin; Stein, Falk-Ulrich; Bocklage, Lars; Matsuyama, T.; Im, Mi‐Young; Fischer, Peter; Meier, Guido

doi:10.1063/1.4874803

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The circuit model not only provides a useful picture for understanding the magneto-transport properties, but also serves as a guiding principle for designing artificial spin-ices as reconfigurable magneto-resistive devices. One of the novel features of artificial spin ice is the potential to manipulate these emergent magnetic charge degrees of freedom, for example, through local injection of domain walls into the nanowires [35][36][37]. We expect our method provide a useful tool to further understand the intriguing interplay of magnetic charges and magnetotransport in artificial spin ice.…”

Section: Discussion and Outlookmentioning

confidence: 95%

Magnetotransport in Artificial Kagome Spin Ice

Chern

2017

Phys. Rev. Applied

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Magnetic nanoarray with special geometries exhibits nontrivial collective behaviors similar to those observed in the spin ice materials. Here we present a novel circuit model to describe the complex magnetotransport phenomena in artificial kagome spin ice. In this picture, the system can be viewed as a resistor network driven by voltage sources that are located at vertices of the honeycomb array. The differential voltages across different terminals of these sources are related to the ice-rules that govern the local magnetization ordering. The circuit model relates the transverse Hall voltage of kagome ice to the underlying spin correlations. Treating the magnetic nanoarray as metamaterials, we present a mesoscopic constitutive equation relating the Hall resistance to magnetization components of the system. We further show that the Hall signal is significantly enhanced when the kagome ice undergoes a magnetic-charge ordering transition. Our analysis can be readily generalized to other lattice geometry, providing a quantitative method for the design of magnetoresistance devices based on artificial spin ices.

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Section: Discussion and Outlookmentioning

confidence: 95%

Magnetotransport in Artificial Kagome Spin Ice

Chern

2017

Phys. Rev. Applied

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“…The possibility to generate DWs with defined chirality was found recently through MTXM studies by creating vortex DWs in permalloy nanowires through nanosecond long current pulses with varying polarity and adjusting the alignment between the stripline and the nanowire [200].…”

Section: B Magnetic Dwsmentioning

confidence: 99%

X-Ray Imaging of Magnetic Structures

Fischer

2015

IEEE Trans. Magn.

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The characterization of nanoscale magnetic structures, their static properties, and fast spin dynamics with polarized soft X-rays has become an indispensable analytical tool due to the unique features of those probes. The spectroscopic magnetic response serves as a fingerprint of the specimen and can give quantitative information on element-specific spin and orbital magnetic moments. Images of magnetic domain structures at a spatial resolution down to nearly 10 nm, ultimately in all three dimensions, can be obtained with various X-ray microscopy techniques and can further be combined with stroboscopic pump-probe schemes to image the spin dynamics of spin structures, such as the motion of domain walls in nanowires or the vortex core dynamics in micropatterned magnetic elements. Next generation sources of polarized soft X-rays such as X-ray free electron lasers or high-harmonic generation laser sources hold the promise to provide nanometer spatial and femtosecond time resolution, enabling to address thus fundamental magnetic length and time scales in magnetism. This paper reviews the various X-ray imaging techniques using polarized soft X-rays by summarizing their characteristic features, recent achievements, and current limitations as well as future opportunities. A brief overview on other magnetic imaging techniques are given to set magnetic X-ray imaging techniques into context. Index Terms-Magnetic diffractive imaging, photoemission electron microscopy, soft X-ray spectromicroscopy, spin dynamics, X-ray magnetic circular dichroism (XMCD), X-ray optics. 0018-9464

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“…How to manipulate the chirality and polarity of vortex walls moving on magnetic stripes is a challenging issue, mainly because of the difficulty in obtaining good-to-noise ratio with single object measurements and not in arrays, as it has been done in most of the work reported so far. Some recent papers have reported experimental [10][11][12][13][14][15], and simulation [16] data about the dynamics of domain walls in Permalloy (Py) nanowires with notches, walls driven by magnetic field and/or spin polarized current. These authors have demonstrated that notches with different geometries (squares or triangular) provide different potential barriers to the domain walls, which in turn can be transversal or vortex walls [17,18].…”

Section: Introductionmentioning

confidence: 99%

Control of the magnetic vortex chirality in Permalloy nanowires with asymmetric notches

Brandão

Novak

Lozano

et al. 2014

Journal of Applied Physics

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We have investigated the motion of vortex domain walls passing across non symmetric triangular notches in single Permalloy nanowires. We have measured hysteresis cycles using the focused magneto-optical Kerr effect before and beyond the notch, which allowed to probe beyond the notch the occurrence probability of clockwise (CW) and counter-clockwise (CCW) walls in tail-to-tail (TT) and head-to-head (HH) configurations. We present experimental evidence of chirality flipping provided by the vortex -notch interaction. With a low exit angle the probability of chirality flipping increases and here with the lowest angle of 15 o the probability of propagation of the energetically favored domain wall configuration (CCW for TT or CW for HH walls) is ≈ 75%. Micromagnetic simulations reveal details of the chirality reversal dynamics. arXiv:1409.6370v2 [cond-mat.mes-hall]

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Fast generation of domain walls with defined chirality in nanowires

Abstract: Currentinduced coupled domain wall motions in a twonanowire system Appl. Phys. Lett. 99, 152501 (2011) The effect of geometrical confinement and chirality on domain wall pinning behavior in planar nanowires J. Appl. Phys.

Cited by 5 publications

References 18 publications

Magnetotransport in Artificial Kagome Spin Ice

Magnetotransport in Artificial Kagome Spin Ice

X-Ray Imaging of Magnetic Structures

Control of the magnetic vortex chirality in Permalloy nanowires with asymmetric notches

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