Hard Magnetic Properties of Co-Rich Microwires Crystallized by Current Annealing

Evstigneeva, S.A.; Nematov, M.G.; Omelyanchik, Alexander; Yudanov, N. A.; Rodionova, Valeria; Panina, L.V.

doi:10.1109/lmag.2020.2974152

Cited by 10 publications

(8 citation statements)

References 34 publications

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“…In this case, after devitrification of amorphous Fe50Pt40Si10 microwire, Hc ≈ 40 kA/m is observed. Magnetic hardening is also reported in Co-rich microwires annealed by Joule heating [116]. Consequently, magnetic properties of crystalline microwires depend on the chemical composition of the metallic nucleus and on structural features (grain size, precipitating phases) of either as-prepared or annealed microwire: crystalline microwire can exhibit either soft magnetic properties or semi-hard magnetic properties.…”

Section: Tuning Of Hysteretic Magnetic Properties In Crystalline and mentioning

confidence: 94%

“…On the other hand, magnetically hard and semi-hard wires are suitable for some applications specifically to the development of smart markers for the electronic article surveillance, compass needles, motors, tachometers, magnetic microelectromechanical systems (MEMS), magnetic tips for On the other hand, magnetically hard and semi-hard wires are suitable for some applications specifically to the development of smart markers for the electronic article surveillance, compass needles, motors, tachometers, magnetic microelectromechanical systems (MEMS), magnetic tips for magnetic force microscopy, or dentistry [112,113]. Recently, several successful attempts to obtain elevated coercivity in microwires have been reported [114][115][116]. Among others, various approaches have been developed to increase coercivity through the use of new alloys, i.e., Fe-Pt based alloys [114] or Heusler-type (Ni-Mn-Ga) alloys [115].…”

Section: Tuning Of Hysteretic Magnetic Properties In Crystalline and mentioning

confidence: 99%

“…Processes 2020, 8, x FOR PEER REVIEW 22 of 28 magnetic force microscopy, or dentistry [112,113]. Recently, several successful attempts to obtain elevated coercivity in microwires have been reported [114][115][116]. Among others, various approaches have been developed to increase coercivity through the use of new alloys, i.e., Fe-Pt based alloys [114] or Heusler-type (Ni-Mn-Ga) alloys [115].…”

Section: Tuning Of Hysteretic Magnetic Properties In Crystalline and mentioning

confidence: 99%

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Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

et al. 2020

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The influence of post-processing conditions on the magnetic properties of amorphous and nanocrystalline microwires has been thoroughly analyzed, paying attention to the influence of magnetoelastic, induced and magnetocrystalline anisotropies on the hysteresis loops of Fe-, Ni-, and Co-rich microwires. We showed that magnetic properties of glass-coated microwires can be tuned by the selection of appropriate chemical composition and geometry in as-prepared state or further considerably modified by appropriate post-processing, which consists of either annealing or glass-coated removal. Furthermore, stress-annealing or Joule heating can further effectively modify the magnetic properties of amorphous magnetic microwires owing to induced magnetic anisotropy. Devitrification of microwires can be useful for either magnetic softening or magnetic hardening of the microwires. Depending on the chemical composition of the metallic nucleus and on structural features (grain size, precipitating phases), nanocrystalline microwires can exhibit either soft magnetic properties or semi-hard magnetic properties. We demonstrated that the microwires with coercivities from 1 A/m to 40 kA/m can be prepared.

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Section: Tuning Of Hysteretic Magnetic Properties In Crystalline and mentioning

confidence: 94%

Section: Tuning Of Hysteretic Magnetic Properties In Crystalline and mentioning

confidence: 99%

Section: Tuning Of Hysteretic Magnetic Properties In Crystalline and mentioning

confidence: 99%

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Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

et al. 2020

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“…Elevated coercivity, Hc ≈ 40 kA/m, has been achieved in properly annealed Fe50Pt40Si10 microwires upon devitrification of the amorphous precursor (see Figure 17). Several alternative routes allowing magnetic hardening include controllable crystallization of Co-or Fe-rich microwires by Joule heating [84,85], by directional crystallization [86], by conventional furnace annealing [74], or by employing novel chemical compositions [87].…”

Section: Multi-bit Magnetic Tags Applications Of Magnetic Microwiresmentioning

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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“…Similar magnetic properties were obtained in microwires of Co-rich composition which are crystallized from an amorphous phase. [56,57]…”

Section: Magnetic Properties Of Feco Nwsmentioning

confidence: 99%

1D Nanomaterials in Fe‐Group Metals Obtained by Synthesis in the Pores of Polymer Templates: Correlation of Structure, Magnetic, and Transport Properties

Panina

Zagorskiy

Shymskaya

et al. 2021

Physica Status Solidi (a)

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1D cylindrical magnetic nanostructures (FeNi, FeCo, FeCoP) of complex topology such as nanowires (NWs), nanotubes (NTs), multilayered nanowires, and core–shell structures are discussed from the perspective of engineering a wide variety of magnetic materials from hard to semihard to soft. Most of recent data are given for the materials synthesized in the pores of polymer ion‐track membranes, which makes it possible to tune systematically the geometrical parameters, morphology, and composition. The key properties including crystal and micromagnetic structure, magnetic anisotropy, and coercivity are analyzed. Co‐based NWs with uniform morphology demonstrate coercivity of more than 10 kOe due to the combination of crystalline and shape anisotropies. In the case of NTs, the demagnetizing effect is reduced owing to a helical arrangement of the magnetization, which leads to low values of coercivity and remanence magnetization. Varying the geometrical parameters of multilayered NWs, the alternating soft and semihard magnetic layers can be made within a single nanowire, which is important for spin‐valve magnetoresistance. Au‐coated ferromagnetic nanostructures are biocompatible and can be used to enhance optical absorption. Ni@Au NTs used as substrates for Raman spectroscopy demonstrate the enhancement factor of the order of 104. Some aspects related to applications of 1D magnets are briefly overviewed.

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Hard Magnetic Properties of Co-Rich Microwires Crystallized by Current Annealing

Cited by 10 publications

References 34 publications

Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

Electronic Surveillance and Security Applications of Magnetic Microwires

1D Nanomaterials in Fe‐Group Metals Obtained by Synthesis in the Pores of Polymer Templates: Correlation of Structure, Magnetic, and Transport Properties

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