Current induced domain wall propagation in Co-rich amorphous microwires

Zhukova, V.; Blanco, J.M.; Chizhik, A.; Ipatov, M.; Zhukov, A.

doi:10.1063/1.4977495

Cited by 3 publications

(7 citation statements)

References 22 publications

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“…And the circumferential magnetization process in the shell is improved. However, it is necessary to pay attention to the magnetic interaction between the shell and the core magnetization at the same time which will also induces demagnetization 9,14,15 . Therefore, circumferential magnetization can continue only if the applied circular magnetic field reaches a threshold value, that is, the magnetization process will produce a huge change, at which the impedance reaches a peak value.…”

Section: Resultsmentioning

confidence: 99%

“…When the bias current is 2mA, the GMI effect and its asymmetry feature near the zero magnetic field are more pronounced and stronger. However, when the circumferential field created by the current is too more powerful, domain wall motion in the shell finally is suppressed together with the asymmetry, resulting in a reduction of the permeability and thus of the GMI effect with the increase of driving or bias current 9,17 , as shown in Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

“…Although the bias current of 1mA can influence the circular magnetization process of fibers, the effect on GMI is not enough to change its main feature. When the bias current is greater than 1.5mA, the induced magnetic field is greater than the coercivity, which has a huge impact on the circular magnetization process of these Co-based fibers 9 . As the frequency increases, the skin effect gets strong, so even a small current can produce enough circular magnetic field to affect the circumferential magnetization process and GMI effect.…”

Section: Resultsmentioning

confidence: 99%

“…The unique magnetization process of this kind of fibers makes it has important application in the development of magnetic sensors. However, Zhukova et al recently have found that the magnetization process of this kind of fibers is indeed complex and not fully understood and mastered 9,10 . They found that due to the interplay between the shape axial and circumferential anisotropies, amorphous ferromagnetic fibers exhibit a rich variety of domainline magnetic phases 11 .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Giant Magneto Impedance Effect of Co-Based Metallic Fiber Under Bias Magnetic Field

2019

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The giant magneto impedance, GMI, effect of Co-based metallic fibers prepared by melt-extracted technology is investigated under different bias direct electrical current I b. The GMI curves have single peaks which are symmetric about zero field at and below 1MHz. However, the bimodal GMI curves which have asymmetric peaks are observed when I b is over 2mA at 0.1MHz. And asymmetric GMI, AGMI, effect is also appeared at 1MHz when I b just is 1mA and the field sensitivity of GMI effect is increased 5.6 times. The GMI effect and magnetization process is affected by the bias magnetic field profoundly induced by I b , which is correlated with the outer shell domain structures with circumferentially magnetization easy axis existed in the outer shell of Co-rich magnetic wires with low and negative magnetostriction. Below 1 MHz, only if the bias current is over 1.5mA which induces a magnetic circumferential magnetic field is above the coercivity of 14.4A/m, the circumferential magnetization and GMI effect can experience the bias magnetic field effect. Above 1MHz, the skin effect gets stronger and significantly decreases the total participants of circular magnetization process in the fibers and consequently, the circular outer shell magnetization process gets much sensitive to circular bias magnetic field. AGMI effect with high field sensitivity is realized due to the bias current.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Giant Magneto Impedance Effect of Co-Based Metallic Fiber Under Bias Magnetic Field

2019

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“…The current excitation, on the other hand, by passing current directly through the magnetic sample, appears to be simpler and more suitable for practical purposes. There are many reports on the current-driven domain wall motion in nanometric magnetic strips obtained by means of deposition 21,22 , but only a very few on the effects of a current passing through the sample on the magnetic properties of Co-based microwires 23,24 .…”

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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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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Current induced domain wall propagation in Co-rich amorphous microwires

Cited by 3 publications

References 22 publications

Giant Magneto Impedance Effect of Co-Based Metallic Fiber Under Bias Magnetic Field

Giant Magneto Impedance Effect of Co-Based Metallic Fiber Under Bias Magnetic Field

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

Review of Domain Wall Dynamics Engineering in Magnetic Microwires

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