Novel Applications of Bistable Magnetic Microwires

Sabol, R.; Klein, Peter; Ryba, T.; Hvizdos, L.; Varga, R.; Rovňák, Marián; Šulla, I; Mudronova, D.; Gálik, Ján; Poláček, Irenej; Živčák, Jozef; Hudák, Radovan

doi:10.12693/aphyspola.131.1150

Cited by 27 publications

(23 citation statements)

References 6 publications

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“…Additionally, the fabrication process of amorphous materials involving rapid melt quenching is fast and inexpensive [4][5][6][7][8]10]. Accordingly, amorphous soft magnetic materials are useful for the design of robust magnetic devices and magnetoelastic sensors [13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Electronic Surveillance and Security Applications of Magnetic Microwires

et al. 2021

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Applications in security and electronic surveillance require a combination of excellent magnetic softness with good mechanical and anticorrosive properties and low dimensionality. We overviewed the feasibility of using glass-coated microwires for electronic article surveillance and security applications, as well as different routes of tuning the magnetic properties of individual microwires or microwire arrays, making them quite attractive for electronic article surveillance and security applications. We provide the routes for tuning the hysteresis loops’ nonlinearity by the magnetostatic interaction between the microwires in the arrays of different types of amorphous microwires. The presence of neighboring microwire (either Fe- or Co-based) significantly affects the hysteresis loop of the whole microwires array. In a microwires array containing magnetically bistable microwires, we observed splitting of the initially rectangular hysteresis loop with a number of Barkhausen jumps correlated with the number of magnetically bistable microwires. Essentially, nonlinear and irregular hysteresis loops have been observed in mixed arrays containing Fe- and Co-rich microwires. The obtained nonlinearity in hysteresis loops allowed to increase the harmonics and tune their magnetic field dependencies. On the other hand, several routes allowing to tune the switching field by either postprocessing or modifying the magnetoelastic anisotropy have been reviewed. Nonlinear hysteresis loops have been also observed upon devitrification of amorphous microwires. Semihard magnetic microwires have been obtained by annealing of Fe–Pt–Si microwires. The observed unique combination of magnetic properties together with thin dimensions and excellent mechanical and anticorrosive properties provide excellent perspectives for the use of glass-coated microwires for security and electronic surveillance applications.

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Section: Introductionmentioning

confidence: 99%

Electronic Surveillance and Security Applications of Magnetic Microwires

et al. 2021

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“…It is practically difficult to achieve it without intervention in the technology or autoclave construction. Outputs from FTA but ETA (event tree analysis) analysis are important inputs to the risk assessment process by other methods, such as L-matrix analysis, hazard and operability analysis (HAZOP), fault tree analysis (FTA), bow-tie analysis and fault mode effect analysis [37,38], or Failure Mode and Effects Analysis (FMEA). The legislation of the Slovak Republic, based on the directives of the European Union, Council Directive 89/391/EEC on the introduction of measures to encourage improvements in the safety and health of workers at work and Council Directive 89/392/EEC machinery directive, shows organizations to manage their risks.…”

Section: Monte Carlo Methodsmentioning

confidence: 99%

Application of FTA Analysis for Calculation of the Probability of the Failure of the Pressure Leaching Process

et al. 2021

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European Union legislation requires organizations to assess their processes in the context of risk management. The main task of risk management is to manage all risks that can significantly affect the outcome of processes. The article is focused on risk evaluation in pressure leaching at elevated temperature using the method Fault Tree Analysis (FTA). The effectivity of pyrite and arsenic pyrite decomposition by oxidative pressure leaching is influenced by the duration of the process, by the temperature, concentration of the leaching solution and by a density of the slurry. It was found that, under equitable conditions, the arsenic pyrite decomposes more intensely than pyrite. Under laboratory conditions, leaching is performed in an autoclave. Due to the aggressive environment, increased pressure and temperature, process failure is possible. Its probability was calculated by FTA. It has been found that the probability of the top event in the examined process was disproportionately high (0.057) and represents an invitation to take corrective actions. The Monte Carlo method was used for the simulation of the effect the probability of basic events on the probability of the top event—the failure of the leaching process.

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“…This method allows the production of glasscoated microwires from a small amount of master alloy (typically 1-2 g) by rapid quenching method. Glass-coated amorphous microwires offer various functionality for sensing applications [15][16][17][18]. Recently, Taylor -Ulitovsky method has been employed for the production of Ni 2 MnGabased microwires [19].…”

Section: Introductionmentioning

confidence: 99%

Reversible structural transition in monocrystalline Ni2FeGa microwires for shape-memory applications

Frolova¹,

Ryba²,

Gamcová

et al. 2021

Materials Science and Engineering: B

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We report on the production and characterization of Heusler-based Ni 2 FeGa microwires exhibiting twoway shape memory effect. The microwires are characterized by a monocrystalline structure with a strong preferred crystallographic orientation that shows [1 1 1] axis parallel to the wire's axis for high-temperature L2 1 austenite phase, while the [0 1 7] axis is preferred for low-temperature monoclinic phase. Variation of crystallographic axis (and corresponding easy magnetization axis) leads to 1600% variation of magnetic permeability due to a 2% strain in axial direction. Such straining is reversible immediately after production without the necessity of further thermal treatment. These properties give the microwire function of very sensitive SMART actuators that can be easily produced in a large amount.

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Novel Applications of Bistable Magnetic Microwires

Cited by 27 publications

References 6 publications

Electronic Surveillance and Security Applications of Magnetic Microwires

Electronic Surveillance and Security Applications of Magnetic Microwires

Application of FTA Analysis for Calculation of the Probability of the Failure of the Pressure Leaching Process

Reversible structural transition in monocrystalline Ni2FeGa microwires for shape-memory applications

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