scholarly journals Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires

2020 ◽  
Vol 10 (3) ◽  
pp. 981 ◽  
Author(s):  
Paula Corte-León ◽  
Ahmed Talaat ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
Juan María Blanco ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Gmi Effect ◽  
Annealing Conditions ◽  
Induced Magnetic Anisotropy ◽  
Magnetic Softness ◽  
Amorphous Microwires

Stress-annealing enabled a considerable improvement in the GMI effect in both Fe- and Co-rich glass-coated microwires. Additionally, a remarkable magnetic softening can be achieved in stress-annealed Fe-rich microwires. Observed stress-annealing induced magnetic anisotropy is affected by annealing conditions (temperatures and stresses applied during annealing). The highest GMI ratio up to 310% was obtained in stress-annealed Co-rich microwires, although they presented rectangular hysteresis loops. A remarkable magnetic softness and improved GMI ratio over a wide frequency range were obtained in stress-annealed Fe-rich microwires. Irregular magnetic field dependence observed for some stress-annealing conditions is attributed to the contribution of both the inner axially magnetized core and outer shell, with transverse magnetic anisotropy.

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.

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).

Stress-induced magnetic anisotropy enabling engineering of magnetic softness of Fe-rich amorphous microwires

2020 ◽  
Vol 510 ◽  
pp. 166939 ◽  
Author(s):  
P. Corte-Leon ◽  
V. Zhukova ◽  
J.M. Blanco ◽  
L. González-Legarreta ◽  
M. Ipatov ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Induced Magnetic Anisotropy ◽  
Magnetic Softness ◽  
Amorphous Microwires

Optimizing magnetoimpedance of amorphous microwires by nanocarbon-induced magnetic anisotropy

2020 ◽  
Vol 502 ◽  
pp. 166527 ◽  
Author(s):  
Diana Estevez ◽  
Yujie Zhao ◽  
Yunfei Wang ◽  
Faxiang Qin ◽  
Hua-Xin Peng
Keyword(s):  
Magnetic Anisotropy ◽  
Induced Magnetic Anisotropy ◽  
Amorphous Microwires

scholarly journals Electronic Surveillance and Security Applications of Magnetic Microwires

2021 ◽  
Author(s):  
Valentina Zhukova ◽  
Paula Corte-Leon ◽  
Juan Maria Blanco ◽  
Mihail Ipatov ◽  
Julian Gonzalez ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Hysteresis Loops ◽  
Electronic Surveillance ◽  
Post Processing ◽  
Security Applications ◽  
Non Linear ◽  
Magnetic Softness ◽  
Rectangular Hysteresis Loop ◽  
Low Dimensionality ◽  
Amorphous Microwires

Applications in security and electronic surveillance require combination of excellent magnetic softness with good mechanical and anti-corrosive properties and low dimensionality. We overviewed the properties of soft magnetic glass-coated microwires and different post-processing making them quite attractive for electronic article surveillance and security applications. We studied the magnetostatic interaction between the microwires and routes to tune the non-linear hysteresis loops by using the arrays of different types of amorphous microwires. The presence of neighbouring 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, non-linear and irregular hysteresis loops have been observed in mixed arrays containing Fe and Co-rich microwires. The observed non-linearity in hysteresis loops allowed to increase the harmonics and tune their magnetic field dependencies. Non-linear hysteresis loops have been also observed upon devitrification of amorphous microwires. On the other hand, several routes allowing to tune the switching field by either post-processing or modifying the magnetoelastic anisotropy have been reviewed. Observed unique combination of magnetic properties together with thin dimensions and excellent mechanical and anti-corrosive properties provide excellent perspectives for the use of glass-coated microwires for security and electronic surveillance applications.

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