Excess velocity of magnetic domain walls close to the depinning field

Caballero, Nirvana; Aguirre, Iván Fernández; Albornoz, Liliana; Kolton, Alejandro B.; Rojas-Sánchez, J.-C.; Collin, Sophie; George, J. M.; Díaz-Pardo, Rebeca; Jeudy, V.; Bustingorry, Sebastián; Curiale, J.

doi:10.1103/physrevb.96.224422

Cited by 21 publications

(19 citation statements)

References 63 publications

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“…There is thus an intrinsic relation between dynamical and geometrical features of interfaces. In the case of ferromagnetic ultrathin films, µ ≃ 1/4 [13][14][15][16] and d = 1 gives a prediction of ζ = 2/3, which was corroborated for different materials [13,17,18].…”

Section: Introductionmentioning

confidence: 73%

Degradation of domains with sequential field application

Caballero¹

2021

J. Stat. Mech.

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Recent experiments show striking unexpected features when alternating square magnetic field pulses are applied to ferromagnetic samples: domains show area reduction and domains walls change their roughness. We explain these phenomena with a simple scalar-field model, using a numerical protocol that mimics the experimental one. For a bubble and a stripe domain, we reproduce the experimental findings: the domains shrink by a combination of linear and exponential behavior. We also reproduce the roughness exponents found in the experiments. Our results suggest that the observed effects are due to a change in the disorder correlation length when the domain walls are subject to alternating fields during the first cycles, where the initial state of the interface plays a crucial role. Finally, our simulations explain the area loss by the interplay between disorder effects and effective fields induced by the local domain curvature.

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Section: Introductionmentioning

confidence: 73%

Degradation of domains with sequential field application

Caballero¹

2021

J. Stat. Mech.

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“…Although we mainly report results for one region of a specific sample, we have made similar measurements in other regions of the same sample and also in a Pt(6 nm)/[Co(0.2 nm)/ Ni(0.6 nm)] 3 /Al(5 nm) sample, where the numbers in parenthesis stand for thickness and the ferromagnetic layer consists in a stack of three Co(0.2 nm)/Ni(0.6 nm) bilayers (for more information about these samples and their DW dynamics, see Refs. [34,35]). In both cases, the results are consistent with the main universal results reported for the specific region of the Pt/Co/Pt sample in Sec.…”

Section: Discussionmentioning

confidence: 99%

Intermittent collective dynamics of domain walls in the creep regime

et al. 2018

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We study the ultraslow domain-wall motion in ferromagnetic thin films driven by a weak magnetic field. Using time-resolved magneto-optical Kerr effect microscopy, we access to the statistics of the intermittent thermally activated domain-wall jumps between deep metastable states. Our observations are consistent with the existence of creep avalanches: roughly independent clusters with broad size and ignition waiting-time distributions, each one composed by a large number of spatiotemporally correlated thermally activated elementary events. Moreover, we evidence that the large-scale geometry of domain walls is better described by depinning rather than equilibrium universal exponents.

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“…In particular since the pioneer work by Lemerle et al (62) there have been several recent works in thin magnetic systems reporting a consistent creep behavior with a mean domain wall velocity showing a stretched exponential law with µ = 1/4 at low enough driving fields (12,79,64,81,82,83,84,85,86,87) and for different temperatures (79). The energy barrier encountered by the wall has been estimated using the Arrhenius formula U = −KBT log v/v0 with v0 is a characteristic field independent velocity (64).…”

Section: Creep Velocitymentioning

confidence: 99%

Creep Motion of Elastic Interfaces Driven in a Disordered Landscape

Ferrero

Foini

Giamarchi

et al. 2021

Annu. Rev. Condens. Matter Phys.

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The thermally activated creep motion of an elastic interface weakly driven on a disordered landscape is one of the best examples of glassy universal dynamics. Its understanding has evolved over the past 30 years thanks to a fruitful interplay among elegant scaling arguments, sophisticated analytical calculations, efficient optimization algorithms, and creative experiments. In this article, starting from the pioneer arguments, we review the main theoretical and experimental results that lead to the current physical picture of the creep regime. In particular, we discuss recent works unveiling the collective nature of such ultraslow motion in terms of elementary activated events. We show that these events control the mean velocity of the interface and cluster into “creep avalanches” statistically similar to the deterministic avalanches observed at the depinning critical threshold. The associated spatiotemporal patterns of activated events have been recently observed in experiments with magnetic domain walls. The emergent physical picture is expected to be relevant for a large family of disordered systems presenting thermally activated dynamics.

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Excess velocity of magnetic domain walls close to the depinning field

Cited by 21 publications

References 63 publications

Degradation of domains with sequential field application

Degradation of domains with sequential field application

Intermittent collective dynamics of domain walls in the creep regime

Creep Motion of Elastic Interfaces Driven in a Disordered Landscape

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