Surface magnetic structures induced by mechanical stresses in Co-rich microwires

Chizhik, A.; Zhukova, V.; Zhukov, A.; González, J.; Gawroński, P.; Kułakowski, K.; Stupakiewicz, A.

doi:10.1016/j.jallcom.2017.11.253

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…The length of the DWs is the main difference between domain structure observed herein and the previously-reported circular 1 (see Fig. 2(a) ) and inclined elliptic helical structures 13 (see Fig. 2(b) ).…”

Section: Resultscontrasting

confidence: 58%

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Spiral magnetic domain structure in cylindrically-shaped microwires

Chizhik

Zhukov

González

et al. 2018

Sci Rep

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Identification and characterisation of novel and unusual magnetization states remains a topic of research in modern magnetism. Recently, control of the magnetization state between the surface and volume in cylindrical microwires with the giant magneto-impedance effect has been demonstrated. Herein, the phenomenon of spatial migration of spiral magnetic domains inside a microwire is demonstrated using the magneto-optical Kerr effect. The main properties of the inclined spiral structure were determined, where the surface domain structure possessed a length limited only by actual sample length. Transformation of the structure from a spiral to an elliptical structure could be controlled by external torsion stress. Hysteresis and magnetic images were simulated based on a model assuming a spatial distribution of the internal stress inside the microwire, whose results were consistent with the experimental results. A consistent interpretation of the results in terms of the formation and transformation of the spiral magnetic domain structure is proposed.

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Section: Resultscontrasting

confidence: 58%

“…The torsion stress induces a transformation of the magnetization reversal and the domain structure in the wire as a whole, but not at the surface alone. An increase of the torsion stress forms a structure that is sufficiently homogeneous in the entire volume of the microwire, including the surface region 13 .…”

Section: Discussionmentioning

confidence: 99%

Spiral magnetic domain structure in cylindrically-shaped microwires

Chizhik

Zhukov

González

et al. 2018

Sci Rep

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“…The asymmetrical characteristic of GMI curve is elongated and AGMI effect gradually increases. The GMI effect comes from the change of circular permeability with external magnetic field, so it is closely related to the magnetization process 12,13 . There is a "coreshell" magnetic domain structure for these kind of the Cobased micro fibers 4 .…”

Section: Resultsmentioning

confidence: 99%

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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“…The images of surface magnetic domain structure were obtained by magneto-optical Kerr effect (MOKE) polarizing microscopy (longitudinal geometry). A combination of crossed axial and circular magnetic fields and external mechanical stresses was applied [36]. The torsion stress τ of two opposite signs and limited range of amplitude was applied to the microwires.…”

Section: Methodsmentioning

confidence: 99%

“…Schematic picture of MOKE geometry and application of torsion stress t + and t -. Reprinted with permission from[36].…”

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confidence: 99%

Reversible and Non-Reversible Transformation of Magnetic Structure in Amorphous Microwires

et al. 2020

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We provide an overview of the tools directed to reversible and irreversible transformations of the magnetic structure of glass-covered microwires. The irreversible tools are the selection of the chemical composition, geometric ratio, and the stress-annealing. For reversible tuning we use the combination of magnetic fields and mechanical stresses. The studies were focused on the giant magnetoimpedance effect and the velocity of the domain walls propagation important for the technological applications. The essential increase of the giant magnetoimpedance effect and the control of the domain wall velocity were achieved as a result of the use of two types of control tools. The performed simulations reflect the real transformation of the helical domain structures experimentally found.

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Surface magnetic structures induced by mechanical stresses in Co-rich microwires

Cited by 6 publications

References 8 publications

Spiral magnetic domain structure in cylindrically-shaped microwires

Spiral magnetic domain structure in cylindrically-shaped microwires

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

Reversible and Non-Reversible Transformation of Magnetic Structure in Amorphous Microwires

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