Physical properties of nearly zero magnetostriction Co-rich glass-coated amorphous microwires

1999 ◽  
Vol 14 (9) ◽  
pp. 3775-3783 ◽  
Author(s):  
A. F. Cobeño ◽  
A. Zhukov ◽  
A. R. de Arellano-López ◽  
F. Elías ◽  
J. M. Blanco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hysteresis Loop ◽  
Hysteresis Loops ◽  
External Stress ◽  
Stress Dependence ◽  
Switching Field ◽  
Flat Shape ◽  
Magnetostriction Constant ◽  
Different Dimensions ◽  
Amorphous Microwires

Magnetic and mechanical properties of Co-rich amorphous microwires of nominal compositions (Co1–xMnx)75Si10 B15 (0.08 < x < 0.11) and Co56.5Fe6.5Ni10B16Si11 with nearly zero magnetostriction constant have been studied. Drastic changes of the hysteresis loop with the decrease of x from rectangular to flat shape were observed at x < 0.1, while the Co56.5Fe6.5Ni10B16Si11 microwire showed rectangular hysteresis loops. Compositions with x ≥ 0.1 have small but positive magnetostriction constant while negative λs values have been observed at x ≤ 4 0.09, indicating rectangular character of the hysteresis loop in samples with nearly zero and even for small negative λs. External stress dependence of switching field, H*, showed an increase of H*; with s for samples with x = 0.11 and a decrease of H* with σ for x = 0.1. Besides, microwires of the same composition but with different dimensions showed different H*(σ) dependencies.

Domain Structure of ‘Thick’ Amorphous Microwires with Nearly Zero Magnetostriction

2001 ◽  
Vol 674 ◽  
Author(s):  
Horia Chiriac ◽  
Tibor-Adrian Óvári ◽  
Minoru Takajo ◽  
Jiro Yamasaki ◽  
Arcady Zhukov
Keyword(s):  
Domain Structure ◽  
Hysteresis Loops ◽  
Magnetic Behavior ◽  
Switching Field ◽  
Core Diameter ◽  
Metallic Core ◽  
Sensor Applications ◽  
One Step ◽  
Amorphous Microwires ◽  
First Time

ABSTRACTNearly zero magnetostrictive glass-coated amorphous microwires are suitable materials for sensor applications. Samples with metallic core diameters below 20 [.proportional]m exhibit almost nonhysteretic BH loop, related to the existence of a domain structure with azimuthal easy axis. The magnetic behavior of these microwires is changing drastically when the metallic core diameter increases over 25 [.proportional]m, i.e. they display a bistable magnetic behavior at low fields, that is a one step magnetization reversal at a certain value of the applied field, called switching field. Results on the direct domain observation in nearly zero magnetostrictive Co68.25Fe4.5Si12.25B15 glass-coated amorphous microwires by means of Kerr microscopy are reported for the first time. The effect of glass removal on the domain structure has been also studied. AC hysteresis loop measurements have been employed to establish a correlation between domain structure and magnetic behavior.Glass-coated microwires exhibit a single domain configuration with the magnetization pointing mostly to the wire axis. The domain structure does not change qualitatively after glass removal, but the parameters of the squared hysteresis loops are modified. The remanence to saturation ratio increases after glass removal, while the switching field decreases.The obtained results are of interest for sensor applications, and show that the metallic core diameter is a dimensional factor that contributes to important changes in the domain structure and magnetization process of such 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.

Mechanical Stress Dependence of the Switching Field in Amorphous Microwires

2015 ◽  
Vol 51 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Rudolf Sabol ◽  
Marian Rovnak ◽  
Peter Klein ◽  
Manuel Vazquez ◽  
Rastislav Varga
Keyword(s):  
Mechanical Stress ◽  
Stress Dependence ◽  
Switching Field ◽  
Amorphous Microwires

Stress dependence of the switching field in Co-rich amorphous microwires

1999 ◽  
Vol 196-197 ◽  
pp. 248-250 ◽  
Author(s):  
P. Aragoneses ◽  
J.M. Blanco ◽  
A.F. Cobeño ◽  
L. Dominguez ◽  
J. Gonzalez ◽  
...  
Keyword(s):  
Stress Dependence ◽  
Switching Field ◽  
Amorphous Microwires

Stress Dependence of Switching Field during the Devitrification of Finemet-Based Magnetic Microwires

2013 ◽  
Vol 543 ◽  
pp. 495-498 ◽  
Author(s):  
J. Olivera ◽  
Rastislav Varga ◽  
J. Anaya ◽  
Arkadi Zhukov
Keyword(s):  
Stress State ◽  
Thermal Treatment ◽  
Internal Stresses ◽  
Thermal Treatments ◽  
Stress Dependence ◽  
Switching Field ◽  
Microstructural Characteristics ◽  
Adequate Treatment ◽  
Magnetostriction Constant ◽  
Non Destructive

We have studied the influence of the thermal treatment on the stress dependence of the switching field during the devitrification of amorphous Fe73.5Cu1Nb3Si11.5B11 microwires. The non-destructive test (NDT) method based on the magnetization reversal of ferromagnetic materials is sensible to changes in microstructural characteristics and the stress state of the material. The stress dependence has been explained considering the magnetoelastic contribution to the switching mechanism which is modified applying the tensile stresses and changing the magnetostriction constant and strength of the internal stresses distribution through thermal treatments. We show that by properly setting a frequency during the measurement and adequate treatment of the sample, it is possible to vary the sensitivity, magnitude and stress dependence of the sample. Keywords: Magnetic bistability, glass-coated microwires, switching field, stress sensor

The stress dependence of the switching field in glass-coated amorphous microwires

1998 ◽  
Vol 31 (21) ◽  
pp. 3040-3045 ◽  
Author(s):  
P Aragoneses ◽  
J M Blanco ◽  
L Dominguez ◽  
J González ◽  
A Zhukov ◽  
...  
Keyword(s):  
Stress Dependence ◽  
Switching Field ◽  
Amorphous Microwires

scholarly journals Electronic Surveillance and Security Applications of Magnetic Microwires

Chemosensors ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 100
Author(s):  
Valentina Zhukova ◽  
Paula Corte-Leon ◽  
Juan Maria Blanco ◽  
Mihail Ipatov ◽  
Julian Gonzalez ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Hysteresis Loops ◽  
Electronic Surveillance ◽  
Magnetic Microwires ◽  
Security Applications ◽  
Nonlinear Hysteresis ◽  
Magnetic Softness ◽  
Rectangular Hysteresis Loop ◽  
Amorphous Microwires

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.

A polycrystal hysteresis model for ferroelectric ceramics

2006 ◽  
Vol 462 (2069) ◽  
pp. 1573-1592 ◽  
Author(s):  
Y Su ◽  
G.J Weng
Keyword(s):  
Electric Field ◽  
Hysteresis Loop ◽  
Ferroelectric Properties ◽  
Electric Displacement ◽  
Hysteresis Loops ◽  
Ferroelectric Ceramics ◽  
Domain Growth ◽  
Thermodynamic Approach ◽  
Hysteresis Model ◽  
Self Consistent

Most key elements of ferroelectric properties are defined through the hysteresis loops. For a ferroelectric ceramic, its loop is contributed collectively by its constituent grains, each having its own hysteresis loop when the ceramic polycrystal is under a cyclic electric field. In this paper, we propose a polycrystal hysteresis model so that the hysteresis loop of a ceramic can be calculated from the loops of its constituent grains. In this model a micromechanics-based thermodynamic approach is developed to determine the hysteresis behaviour of the constituent grains, and a self-consistent scheme is introduced to translate these behaviours to the polycrystal level. This theory differs from the classical phenomenological ones in that it is a micromechanics-based thermodynamic approach and it can provide the evolution of new domain concentration among the constituent grains. It also differs from some recent micromechanics studies in its secant form of self-consistent formulation and in its application of irreversible thermodynamics to derive the kinetic equation of domain growth. To put this two-level micromechanics theory in perspective, it is applied to a ceramic PLZT 8/65/35, to calculate its hysteresis loop between the electric displacement and the electric field ( D versus E ), and the butterfly-shaped longitudinal strain versus the electric field relation ( ϵ versus E ). The calculated results are found to be in good quantitative agreement with the test data. The corresponding evolution of new domain concentration c 1 and the individual hysteresis loops of several selected grains—along with those of the overall polycrystal—are also illustrated.

Temperature and stress dependence of electrical and mechanical properties of Green River oil shale

Fuel ◽  
1979 ◽  
Vol 58 (2) ◽  
pp. 144-148 ◽  
Author(s):  
Richard N. Nottenburg ◽  
Krishnan Rajeshwar ◽  
Robert J. Rosenvold ◽  
Joel B. DuBow
Keyword(s):  
Mechanical Properties ◽  
Oil Shale ◽  
Stress Dependence ◽  
Green River

Manipulation of Magnetic Properties and Domain Wall Dynamics in Amorphous Ferromagnetic Microwires by Annealing under Applied Stress

2014 ◽  
Vol 215 ◽  
pp. 432-436 ◽  
Author(s):  
Kseniay Chichay ◽  
Valeria Rodionova ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
Arcady Zhukov
Keyword(s):  
Magnetic Properties ◽  
Domain Wall ◽  
Hysteresis Loop ◽  
Applied Stress ◽  
Constant Sign ◽  
Domain Wall Dynamics ◽  
Magnetostriction Constant

The effect of annealing under applied stress on magnetic properties of Co-based or CoFeNi-based glass-coated microwires was studied. It was found that CoFeNi-based microwires became bistable after annealing because of changing of magnetostriction constant sign, while Co-based microwires keep S-shape of hysteresis loop. The domain wall dynamics of microwires which became bistable was also investigated and it was shown that microwires with acquired bistability are more suitable for applications.

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