The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

Onufer, J.; Ziman, J.; Rezničák, M.; Kardos, Slavomir

doi:10.12693/aphyspola.131.723

Cited by 8 publications

(2 citation statements)

References 8 publications

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“…The influence of eddy current damping has been claimed to be in the origin of the different mobilities due to an asymmetry effect of the conductivity of the glass-metal interface. [73,86,87] The metal-glass interface would play a significant role via the interdiffusion of metal and metalloid elements into the silicate glass structure enabled by superplasticity phenomenon during the quenching fabrication. [88] In addition, a delay in the stabilization of the inner-core diameter during the DW propagation (e.g., due to frequency and field amplitude effect) has been proposed previously, being also related with a region of negative mobility, S. In a theoretical paper, [89] the unidirectional effect or asymmetric velocity in planar DW is connected with the spin-transfer torque associated with eddy currents at the core-shell interface.…”

Section: Asymmetric Dw Mobility With the Driving Field Directionmentioning

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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Section: Asymmetric Dw Mobility With the Driving Field Directionmentioning

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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“…The velocity of the propagating DWs strongly depends on the magnitude of the driving magnetic field and on the wire characteristics, including composition, dimensions, microstructure, as well as the mechanical stresses induced during preparation (intrinsic), which originate in both the rapid quenching process and in the presence of the glass coating 15–18 . Externally applied mechanical stresses (extrinsic) also affect the domain wall velocity (DWV) 19,20 . Although extensively studied, the magnetic field driven DW motion in glass-coated microwires has relatively low applicability in developing logic devices, due to the difficulty of generating multiple magnetic fields on each magnetic wire segment.…”

Section: Introductionmentioning

confidence: 99%

Field and Current Controlled Domain Wall Propagation in Twisted Glass-Coated Magnetic Microwires

Corodeanu

Chiriac

Damian

et al. 2019

Sci Rep

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The torsion effect on the field and current driven magnetization reversal and the associated domain wall velocity in cylindrical amorphous and nanocrystalline glass-coated microwires is reported. Samples from three representative compositions have been investigated: (1) amorphous Fe 77.5 Si 7.5 B 15 with positive magnetostriction, λ ≅ 25 × 10 −6 , (2) amorphous Co 68.18 Fe 4.32 Si 12.5 B 15 with nearly zero negative magnetostriction, λ ≅ −1 × 10 −7 , and (3) nanocrystalline Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 (FINEMET) with small positive magnetostriction, λ ≅ 2.1 × 10 −6 , all having the diameter of the metallic nucleus, d , of 20 µm and the glass coating thickness, t g , of 11 µm. The results are explained through a phenomenological interpretation of the effects of applied torque on the anisotropy axes within the microwires with different characteristics. Among all the complex mechanical deformations caused by the application of torque on magnetic microwire samples, the most important are the axial compression – for axial field-driven domain wall motion, and the circumferential tension – for electrical current/circumferential field-driven domain wall motion. The Co 68.18 Fe 4.32 Si 12.5 B 15 microwire, annealed at 300 °C for 1 hour and twisted at 168 Rad/m exhibits the optimum characteristics, e.g. the lowest switching current (down to 9 mA~2.9 × 10 −3 A/cm 2 ) and the largest domain wall velocity (up to 2300 m/s).

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Dynamics of domain wall depinning from closure domain structure at the end of bistable glass coated microwire

Ziman

Onufer

Kladivová

2020

Journal of Magnetism and Magnetic Materials

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The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

Cited by 8 publications

References 8 publications

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

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

Field and Current Controlled Domain Wall Propagation in Twisted Glass-Coated Magnetic Microwires

Dynamics of domain wall depinning from closure domain structure at the end of bistable glass coated microwire

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