scholarly journals Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1006
Author(s):  
Valentina Zhukova ◽  
Paula Corte-Leon ◽  
Lorena González-Legarreta ◽  
Ahmed Talaat ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Chemical Composition ◽  
Hysteresis Loops ◽  
Structural Features ◽  
Post Processing ◽  
Soft Magnetic ◽  
Magnetic Microwires ◽  
Prepared State ◽  
Induced Magnetic Anisotropy ◽  
Selection Of

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.

scholarly journals Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

2020 ◽  
Author(s):  
Valentina Zhukova ◽  
Paula Corte-León ◽  
Lorena Gonzalez-Legarreta ◽  
Ahmed Talaat ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Chemical Composition ◽  
Hysteresis Loops ◽  
Structural Features ◽  
Post Processing ◽  
Soft Magnetic ◽  
Magnetic Microwires ◽  
Prepared State ◽  
Induced Magnetic Anisotropy ◽  
Selection Of

The influence of post-processing conditions on the magnetic properties of amorphous and nanocrystalline microwires have been thoroughly analyzed, paying attention on 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.

scholarly journals Development of Magnetically Soft Amorphous Microwires for Technological Applications

Chemosensors ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 26
Author(s):  
Valentina Zhukova ◽  
Paula Corte-Leon ◽  
Juan Maria Blanco ◽  
Mihail Ipatov ◽  
Lorena Gonzalez-Legarreta ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Joule Heating ◽  
Hysteresis Loops ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Magnetic Microwires ◽  
Gmi Effect ◽  
Magnetic Softness ◽  
Order Of Magnitude ◽  
Amorphous Microwires

Amorphous magnetic microwires can be suitable for a variety of technological applications due to their excellent magnetic softness and giant magnetoimpedance (GMI) effect. Several approaches for optimization of soft magnetic properties and GMI effect of magnetic microwires covered with an insulating, flexible, and biocompatible glass coating with tunable magnetic properties are overviewed. The high GMI effect and soft magnetic properties, achieved even in as-prepared Co-rich microwires with a vanishing magnetostriction coefficient, can be further improved by appropriate heat treatment (including stress-annealing and Joule heating). Although as-prepared Fe-rich amorphous microwires exhibit low GMI ratio and rectangular hysteresis loops, stress-annealing, Joule heating, and combined stress-annealed followed by conventional furnace annealing can substantially improve the GMI effect (by more than an order of magnitude).

Effects of Heat Treatment Conditions on Magnetic Properties and Structural Features of Nanocrystalline Fe79Zr10N11 Films

2009 ◽  
Vol 152-153 ◽  
pp. 70-74 ◽  
Author(s):  
E.N. Sheftel ◽  
Rauf S. Iskhakov ◽  
S.V. Komogortsev ◽  
P.K. Sidorenko ◽  
Nikolai S. Perov
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Structural Features ◽  
Soft Magnetic ◽  
Exchange Correlation ◽  
Calculation Technique ◽  
Treatment Conditions ◽  
Random Magnetic Anisotropy ◽  
Anisotropy Model

Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocrystalline Fe79Zr10N11 films were obtained using a calculation technique in frame of the random magnetic anisotropy model. The calculations are performed using approach magnetization to saturation curves. The local magnetic anisotropy fields (Ha), and magnetic anisotropy correlation radii (Rс) reduced to =(A/K)1/2 were determined for the films annealed at 475 and 6000 C for 0.5, 1, 2, and 3 h. The correlation Hc ~(Rc/)3 for the all annealed films was found.

Optimization of Soft Magnetic Properties in Fe-Ni-Based Magnetic Microwires

2016 ◽  
Vol 52 (5) ◽  
pp. 1-3 ◽  
Author(s):  
V. Zhukova ◽  
M. Churyukanova ◽  
S. Kaloshkin ◽  
V. Sudarchikova ◽  
M. Ipatov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Magnetic Microwires

scholarly journals Magnetic Properties of Manganese-Zinc Soft Ferrite Ceramic for High Frequency Applications

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3173
Author(s):  
Lucian-Gabriel Petrescu ◽  
Maria-Cătălina Petrescu ◽  
Valentin Ioniță ◽  
Emil Cazacu ◽  
Cătălin-Daniel Constantinescu
Keyword(s):  
Magnetic Properties ◽  
High Frequency ◽  
High Efficiency ◽  
Magnetic Circuit ◽  
Hysteresis Loops ◽  
Vibrating Sample Magnetometer ◽  
Soft Magnetic ◽  
Mnzn Ferrite ◽  
Manganese Zinc ◽  
Soft Ferrite

A soft magnetic MnZn-type ferrite is considered for high frequency applications. First, the morphological, structural, and chemical composition of the material are presented and discussed. Subsequently, by using a vibrating sample magnetometer (VSM), the hysteresis loops are recorded. The open magnetic circuit measurements are corrected by employing demagnetization factors, and by taking into consideration the local magnetic susceptibility. Finally, the hysteresis losses are estimated by the Steinmetz approach, and the results are compared with available commercial information provided by selected MnZn ferrite manufacturers. Such materials are representative in planar inductor and transformer cores due to their typically low losses at high frequency, i.e., up to several MHz, in low-to-medium power applications and providing high efficiency of up to 97%–99%.

scholarly journals Development of Magnetic Microwires for Magnetic Sensor Applications

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4767 ◽  
Author(s):  
Valentina Zhukova ◽  
Paula Corte-Leon ◽  
Mihail Ipatov ◽  
Juan Maria Blanco ◽  
Lorena Gonzalez-Legarreta ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loops ◽  
Magnetic Sensor ◽  
Internal Stresses ◽  
Soft Magnetic ◽  
Magnetoelastic Anisotropy ◽  
Sensor Applications ◽  
Gmi Effect ◽  
Magnetic Softness ◽  
Magnetic Wires

Thin magnetic wires can present excellent soft magnetic properties (with coercivities up to 4 A/m), Giant Magneto-impedance effect, GMI, or rectangular hysteresis loops combined with quite fast domain wall, DW, propagation. In this paper we overview the magnetic properties of thin magnetic wires and post-processing allowing optimization of their magnetic properties for magnetic sensor applications. We concluded that the GMI effect, magnetic softness or DW dynamics of microwires can be tailored by controlling the magnetoelastic anisotropy of as-prepared microwires or controlling their internal stresses and domain structure by appropriate thermal treatment.

scholarly journals Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1558 ◽  
Author(s):  
Lorena Gonzalez-Legarreta ◽  
Paula Corte-Leon ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Wide Frequency Range ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Annealing Temperatures ◽  
High Annealing

Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment.

Development of Stress and Temperature Sensitive Microwires for the Sensor Applications and Tuneable Composite Materials

2008 ◽  
Vol 54 ◽  
pp. 180-186
Author(s):  
Arkadi Zhukov ◽  
V. Zhukova ◽  
J. Gonzalez ◽  
Larissa V. Panina ◽  
J.M. Blanco
Keyword(s):  
Magnetic Properties ◽  
Composite Materials ◽  
High Performance ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Temperature Sensitive ◽  
Sensor Applications ◽  
Gmi Effect ◽  
Annealing Conditions ◽  
Selection Of

We report on tailoring magnetic properties and giant magneto-impedance GMI in glasscoated microwires fabricated by the Taylor-Ulitovsky method, by means of selection of their alloy composition and/or annealing conditions. Fe-rich microwires subjected to stress annealing show the hysteresis loops of inclined form due to induced transverse magnetic anisotropy, and hence become suitable for GMI. The transverse anisotropy depends on the annealing conditions: temperature, duration and stress. The application of external stress further drastically changes the shape of the hysteresis loops and the GMI spectra. The wires with compositions Co-Fe-Ni-Si-B and Co-Fe-Cr- Si-B are demonstrated to have a low Curie temperature (below 90oC) and pronounced temperaturedependent magnetic properties and GMI effect. Both families of developed microwires are foreseen for applications in high performance stress and temperature sensors as well as in tuneable sensory composite materials. Such composites contain short pieces of microwires embedded into a dielectric matrix and contribute to the effective ac permittivity. The latter depends on the wire magnetic properties through the GMI effect and can be tailored to produce a microwave response sensitive to environment: magnetic field, stress and temperature.

Magnetic Properties of MWNTs-Fe3Al Composite

2009 ◽  
Vol 79-82 ◽  
pp. 1351-1354 ◽  
Author(s):  
Lai Xue Pang ◽  
De Jin Xing ◽  
Ai Qin Zhang ◽  
Jing Xu ◽  
Shi Shuang Sun
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Soft Magnetic Property ◽  
Gradient Force ◽  
Soft Magnetic ◽  
Plasma Sintering ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWNTs)-Fe3Al was prepared by spark plasma sintering. Microstructural investigations show that MWNT remains in the composites. The magnetic properties were investigated with alternating gradient force magnetometer, which shows that the composites still display good soft magnetic property. The MWNTs-Fe3Al composites have a similar magnetic hysteresis loops to that of Fe3Al, indicating the good soft magnetic properties of the composite. Excellent magnetic property implies that MWNT-Fe3Al composites may also have significant potential for applications in electronic-magnetic nanodevice fields.

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