Tracking Random Walk of Individual Domain Walls in Cylindrical Nanomagnets with Resistance Noise

Singh, Amarjit; Mukhopadhyay, Soumik; Ghosh, Arindam

doi:10.1103/physrevlett.105.067206

Cited by 25 publications

(26 citation statements)

References 28 publications

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“…The study of MDW avalanches has become relevant in the field of memory devices [2][3][4], nanowires [5][6][7][8], and metal, alloy or semiconductor thin-films [9][10][11][12]. When ferromagnetic (or ferroelectric) thin-films with quenched disorder are placed in an external magnetic (or electric) field, a rich phenomenology is observed through the study of dynamic properties in the criticality [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic anomalous scaling in a ferromagnetic thin film model

Torres

Buceta

2013

Eur. Phys. J. B

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Recently, the interest on theoretical and experimental studies of dynamic properties of the magnetic domain wall (MDW) of ferromagnetic thin films with disorder placed in an external magnetic field has increased. In order to study global and local measurable observables, we consider the (1 + 1)-dimensional model introduced by Buceta and Muraca [Physica A 390 (2011) 4192], based on rules of evolution that describe the MDW avalanches. From the values of the roughness exponents, global ζ, local ζ loc , and spectral ζ s , obtained from the global interface width, hight-difference correlation function and structure function, respectively, recent works have concluded that the universality classes should be analyzed in the context of the anomalous scaling theory. We show that the model is included in the group of systems with intrinsic anomalous scaling (ζ ≃ 1.5, ζ loc = ζ s ≃ 0.5), and that the surface of the MDW is multi-affine. With these results, we hope to establish in short term the scaling relations that verify the critical exponents of the model, including the dynamic exponent z, the exponents of the distributions of avalanche-size τ and -duration α, among others.

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Section: Introductionmentioning

confidence: 99%

Intrinsic anomalous scaling in a ferromagnetic thin film model

Torres

Buceta

2013

Eur. Phys. J. B

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“…Similar techniques have already shown promise in magnetic field driven DW systems 17 . This method should make it more feasible to utilize DW dynamics for device applications.…”

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confidence: 97%

Electrical signature of magnetic domain-wall dynamics

2011

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Current-induced domain-wall dynamics is studied in a thin ferromagnetic nanowire. The domain-wall dynamics is described by simple equations with four parameters. We propose a procedure to unambiguously determine these parameters by all-electric measurements of the time-dependent voltage induced by the domain-wall motion. We provide an analytical expression for the time variation of this voltage. Furthermore, we show that the measurement of the proposed effects is within reach of current experimental techniques.

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“…The different attempt frequencies observed for the two types of nanocluster arrangements may then be attributed to differences in the domain-wall character or the propagation path through the cluster arrangement. But pinning at defects and geometrical pinning sites, which strongly influence the dynamic behavior of magnetic domains [52][53][54], or the formation of more than one single magnetic domain [16,55] may also be responsible for the increased attempt frequencies extracted by our simple model based only on three domains. In particular, when considering the shape of the bent nanocluster with two large magnetic domains oriented in a relative angle of 60…”

Section: Modelling and Analysis Of The Magnetization Fluctuationsmentioning

confidence: 96%

Analysis of magnetic random telegraph noise in individual arrangements of a small number of coupled MnAs nanoclusters

et al. 2015

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The temporal dependence of the resistance of MnAs nanocluster arrangements grown by selective-area metal-organic vapor-phase epitaxy is investigated at different temperatures. The resistance of such arrangements exhibits random telegraph noise with jumps between discrete resistance levels. The effect is attributed to thermally activated switching of the magnetic domain structure resulting in alterations of spin-dependent scattering between the MnAs clusters of the arrangements. The behavior can be qualitatively understood by a simple model in which it is assumed that the nanocluster arrangement consists of three domains in accordance with investigations by magnetic force microscopy. The magnetizations of the outer larger domains remain fixed, whereas the magnetization of a smaller intermediate domain (or domain wall) exhibits thermally activated switching between local minima of its energy landscape. The results of the model indicate that the time scale of an actual switching event of the entire intermediate domain comprises the nucleation of a seed domain consisting of a few thousand Mn spins followed by the transformation of the entire domain by domain-wall motion in order to reorient its magnetization.

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Tracking Random Walk of Individual Domain Walls in Cylindrical Nanomagnets with Resistance Noise

Cited by 25 publications

References 28 publications

Intrinsic anomalous scaling in a ferromagnetic thin film model

Intrinsic anomalous scaling in a ferromagnetic thin film model

Electrical signature of magnetic domain-wall dynamics

Analysis of magnetic random telegraph noise in individual arrangements of a small number of coupled MnAs nanoclusters

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