Anomalous effects in the domain‐wall dynamics in magnetic microwires

Varga, R.; Infante, G.; Richter, K.; Vázquez, M.

doi:10.1002/pssa.201026371

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…5. As already reported in [7], the field H 0 can be negative. In our samples too H 0 is negative and not the same for slow and fast DWs.…”

Section: Resultssupporting

confidence: 72%

“…2-5 but for instance the magnitude of relative change in mobility at minimum temperature (100 K) is in the interval (0.2, 0.31). This interval seems to be too wide for the model of solid DW and three damping mechanisms (eddy currents, spin relaxation, structural relaxation) are usually used for interpretation of temperature dependence of DW dynamic parameters [7]. Based on these results it seems very probable that model of a solid DW cannot correctly explain the measured v(H) dependences in Fig.…”

Section: Resultsmentioning

confidence: 98%

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The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

et al. 2017

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It has been reported recently that domain wall mobility in Fe-based amorphous glass-coated microwire can be significantly different in the cases when magnetization reversal caused by domain wall motion results in different orientation of magnetization. This behaviour has been called unidirectional effect. The effect of temperature on domain wall velocity vs. axial magnetic field dependences was studied for glass-coated Fe77.5Si7.5B15 microwire samples with strong unidirectional effect. Unidirectional effect was observed for the whole temperature interval from 100 K up to room temperature. Analysis of the results obtained indicates that the model of a solid domain wall does not explain the observed v(H) dependences. It seems very probable that besides standard damping mechanisms also changes in structure (shape) of the domain wall as a function of velocity (magnetic field) should be considered. Understanding of this mechanism could also provide interpretation of unidirectional effect.

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“…5. As already reported in [7], the field H 0 can be negative. In our samples too H 0 is negative and not the same for slow and fast DWs.…”

Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 98%

The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

et al. 2017

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“…Negative values for H 0 have been earlier reported and discussed. [74] Note that in spite of the different fitted H 0 values, the starting of the DW propagation is experimentally observed for a similar value of driving field of H dr %160 A m À1 . In addition, the mobility, S, of the DW takes the values S ¼ 0.82 m 2 As À1 and S ¼ 1.08 m 2 As À1 for H dr þ and H dr À , respectively.…”

Section: Asymmetric Dw Mobility With the Driving Field Directionmentioning

confidence: 84%

Matteucci Effect and Single Domain Wall Propagation in Bistable Microwire under Applied Torsion

Jiménez

Calle

Fernández-Roldán

et al. 2021

Physica Status Solidi (a)

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On the Matteucci Effect and the Bistable Behavior in Microwires under Applied TorsionThe effects of an electrical current flowing through magnetic nanostructures are connected to several underlying novel phenomena that offer new opportunities for electronics technology or "spintronics." [1] For instance, spin-polarized current gives rise to the spin transfer-torque effect, in which the magnetization orientation in a magnetic layer of a tunnel junction or spin valve can be modified. In magnetic storage technologies, the design of writing and reading magnetic bits in high-speed devices profits of the effect induced by small current to inject domain walls (DWs), or to modify their motion characteristics (i.e., race track memories for magnetic storage or in logic devices). [2][3][4] Most of the studies have been conducted in Permalloy lithography nanostripes, where the shape determines the magnetic anisotropy characteristics. There, vortex and transverse DWs are injected or trapped in artificial notches or by local stray fields. [5,6] In cylindrical nanowires, the geometrical symmetry imposes significant differences. The motion of DWs was numerically solved using the Landau-Lifshitz-Gilbert equation, involving all different energy terms, where transverse or vortex DWs are, respectively, obtained for diameters smaller or larger than the exchange length of the corresponding material. [7] More recently, electrochemically grown cylindrical nanowires with diameter in the range 40-400 nm have been investigated experimentally and modeled by micromagnetic simulations. There, the magnetization reversal is typically activated by the propagation of a vortex DW which due to cylindrical geometry is also labeled as Bloch-point DW. [8,9] With the increase in diameter, as is the case of magnetic microwires fabricated by ultrarapid solidification techniques, new observations and opportunities are offered. They are fabricated in a continuous way with up to hundred-meter length and diameter in the range 0.1-90 μm for the so-called glass-coated microwires [10][11][12] and around 120-180 μm for the in-waterquenched ones. [13] Such ultrarapid solidification techniques introduce very strong mechanical stresses that determine most of the magnetic properties which have been reviewed in other studies. [14][15][16]

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“…It appears at low frequency (where there is enough time for relaxation between two subsequent domain wall propagations) [5]. Such a regime can be controlled by the frequency of applied eld and measuring temperature [5].…”

Section: Resultsmentioning

confidence: 99%

Single Domain Wall Propagation at Low Fields

2014

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We have studied the domain wall propagation at low elds regime in thin glass-coated microwire of composition Fe77.5Si7.5B15. It is shown, that power law describes domain wall dynamics at low elds. Such behaviour results from the interaction of the propagating domain wall with the defects present in the material. At high elds, the domain wall mobility becomes negative. This can be explained as a result of domain structure relaxation. The exponent q from power law, which determines the domain wall shape, has a value of 0.19 for both cases, without applied stress and with applied stress of 20 MPa. This means, that domain wall shape is exible in both measurements.

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Anomalous effects in the domain‐wall dynamics in magnetic microwires

Cited by 10 publications

References 22 publications

The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

Matteucci Effect and Single Domain Wall Propagation in Bistable Microwire under Applied Torsion

Single Domain Wall Propagation at Low Fields

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