Time-resolved motion of a single domain wall controlled by a local tunable barrier

Calle, E.; Vázquez, M.; Real, R. P. del

doi:10.1016/j.jmmm.2019.166093

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…Roughly linear v(H) dependencies, reported in subsequent publications on DW dynamics in amorphous microwires [15,47], can be well understood in terms of the viscous DW motion [63]. However, elevated values of v (generally above 1 km/s) obtained for amorphous microwires [15,16,47] were clearly superior to magnitudes of v reported for thicker amorphous and crystalline wires [33][34][35]64].…”

Section: Single Dw Propagation In Amorphous Microwires and Role Of Defectsmentioning

confidence: 90%

“…Spontaneous magnetic bistability can be observed in as-prepared amorphous [16,21,46,47] and nanocrystalline [48,49] microwires with positive magnetostriction coefficient, it can be maintained after devitrification of amorphous microwires [49,50] and even it can be induced by appropriate annealing in amorphous microwires with low negative magnetostriction coefficient [26]. In the latter case, current-induced single DW propagation has been observed [17].…”

Section: Introductionmentioning

confidence: 97%

“…As reported elsewhere [5,15,22,25], such DW propagation starts from the microwire ends, where the closure domains exist because of the demagnetizing field effect. Accordingly, if the DW propagation from one end of the microwire is hindered (for example, by a lower applied magnetic field) the single DW propagation can be realized in magnetically bistable microwires [16,18,46,47]. Thus, magnetically bistable microwires are a unique material allowing studies of single DW propagation.…”

Section: Introductionmentioning

confidence: 99%

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Review of Domain Wall Dynamics Engineering in Magnetic Microwires

et al. 2020

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The influence of magnetic anisotropy, post-processing conditions, and defects on the domain wall (DW) dynamics of amorphous and nanocrystalline Fe-, Ni-, and Co-rich microwires with spontaneous and annealing-induced magnetic bistability has been thoroughly analyzed, with an emphasis placed on the influence of magnetoelastic, induced and magnetocrystalline anisotropies. Minimizing magnetoelastic anisotropy, either by the selection of a chemical composition with a low magnetostriction coefficient or by heat treatment, is an appropriate route for DW dynamics optimization in magnetic microwires. Stress-annealing allows further improvement of DW velocity and hence is a promising method for optimization of DW dynamics in magnetic microwires. The origin of current-driven DW propagation in annealing-induced magnetic bistability is attributed to magnetostatic interaction of outer domain shell with transverse magnetization orientation and inner axially magnetized core. The beneficial influence of the stress-annealing on DW dynamics has been explained considering that it allows increasing of the volume of outer domain shell with transverse magnetization orientation at the expense of decreasing the radius of inner axially magnetized core. Such transverse magnetic anisotropy can similarly affect the DW dynamics as the applied transverse magnetic field and hence is beneficial for DW dynamics optimization. Stress-annealing allows designing the magnetic anisotropy distribution more favorable for the DW dynamics improvement. Results on DW dynamics in various families of nanocrystalline microwires are provided. The role of saturation magnetization on DW mobility improvement is discussed. The DW shape, its correlation with the magnetic anisotropy constant and the microwire diameter, as well as manipulation of the DW shape by induced magnetic anisotropy are discussed. The engineering of DW propagation through local stress-annealing and DW collision is demonstrated.

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Section: Single Dw Propagation In Amorphous Microwires and Role Of Defectsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Review of Domain Wall Dynamics Engineering in Magnetic Microwires

et al. 2020

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“…A Sixtus and Tonks-like experiment (see Figure 3) similar to those proposed in previous studies [17,39] was used for the detection of the DWs and to determine their propagation direction, as well as their speed through the pulses induced in a set of pickup coils. A primary solenoid (1200 turns, 10 cm length, and 53.66 Ω resistance), fed by a function generator, supplied an AC square signal current (51 Hz), supplying an axial driving magnetic field of maximum amplitude H dr ¼ 1200 A m À1 .…”

Section: Methodsmentioning

confidence: 99%

“…The motion of the DWs has been thoroughly investigated making use of the Sixtus and Tonks-like technique by which a series of tiny secondary coils wound along the microwire pick up the respective induced voltages as the DW traverses their locations. [34][35][36][37] The controlled action of local axial and transverse fields [37][38][39][40] or current [41] has been successfully used to artificially move the single DW in cylindrical microwires.…”

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confidence: 99%

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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