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Effect of Temperature and Time of Stress Annealing on Magnetic Properties of Amorphous Microwires

100%
Chichay K., Rodionova V., Ipatov M., Zhukova V., Zhukov A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
600-602
EN
In this work we studied influence of time and temperature of stress annealing on magnetic properties of amorphous Co-based and CoFeNi-based microwires. We showed that this type of treatment can be very effective for manipulation of magnetic properties of amorphous ferromagnetic glass-coated microwires. Co-based microwires keep S-shape hysteresis loop after any annealing. Annealing of Co-based microwires at different conditions allows tailoring of the saturation field. CoFeNi-based microwires present either S-shape or rectangular shape of the hysteresis loops depending on the value of the axial stress during the annealing. We demonstrated the possibility to change the switching field of microwires with acquired bistability in the range from 0.5 to 25 A/m.
2
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Tailoring of Magnetic Properties and Magnetoimpedance Effect in Thin Amorphous Wires

100%
Zhukov A., Talaat A., Ipatov M., Blanco J., Zhukova V.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
694-697
EN
We have studied the effect of annealing conditions on magnetic properties of amorphous CoFeNi-based glass-coated microwires. We show that annealing can be very effective for manipulation the magnetic properties of amorphous ferromagnetic glass-coated microwires. Low coercivity and high giant magnetoimpedance (GMI) effect have been observed in as-prepared Co-rich microwires. After annealing of Co-rich microwires we can observe transformation of inclined hysteresis loops into rectangular and coexistence of fast magnetization switching and GMI effect in the same sample. We demonstrate that the switching field value of microwires can be tailored by annealing in the range from 4 to 200 A/m.
3
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Temperature Dependent Magnetic and Structural Properties of Ni-Mn-Ga Heusler Alloy Glass-Coated Microwires

86%
Shevyrtalov S., Chichay K., Ershov P., Khovaylo V., Zhukov A., Zhukova V., Rodionova V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
603-605
EN
We report on structural and magnetic properties of glass-coated microwires of Ni-Mn-Ga-based Heusler alloys. Structural characterization of the as-prepared microwires revealed that they have a cubic structure at room temperature. It is shown that magnetic properties of microwires can be tailored by heat treatment as well as by removing the glass coating. Specifically, annealing of the microwires has a marked influence of the Curie temperature T_{C} which increases significatly in the heat-treated samples. Release of internal stresses in the microwires by removing the glass coating causes magnetization and the Curie temperature to decrease. This allowed us to conclude that in the studied microwires the magnetostriction constant is positive and estimate the value of internal stresses as being roughly equal to 1.5 GPa.
4
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Fast Magnetization Switching in Amorphous Microwires

86%
Zhukov A., Ipatov M., Blanco J., Chizhik A., Talaat A., Zhukova V.
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vol. 126
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issue 1
7-11
EN
We studied the magnetization switching in magnetically bistable amorphous ferromagnetic microwires. We observed quite fast domain wall propagation along the microwires and a correlation between the magnetoelastic anisotropy, distribution of the local nucleation field along the length of microwire and the domain wall dynamics. We observed that both DW velocity and the range of fields, limiting single DW dynamics, can be manipulated by internal or applied stresses and by annealing. We also observed that under certain conditions a controllable domain wall (DW) collision can be realized in different parts of the wire, and that it is possible to manipulate the DW dynamics in a field-driven regime.
5
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Magnetic Characterization of Co_2MnSi Heusler Microwires

86%
Ryba T., Vargova Z., Varga R., Kováč J., Zhukova V., Zhukov A.
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vol. 126
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issue 1
196-197
EN
We report on the basic magnetic properties of glass-coated Co_2MnSi Heusler microwires. Measurements of hysteresis loops in different directions show that easy magnetization axis coincides with the wire's axis. The frequency dependence of the coercive field has been measured at room temperature in the frequency range from 10 Hz to 10 kHz. The coercivity decreases with the frequency up to 100 Hz and then increases linearly up to 1 kHz.
6
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Engineering of Magnetic Properties of Magnetic Microwires

86%
Zhukov A., Ipatov M., Blanco J., Corte-León P., Olivera J., Gonzalez J., Zhukova V.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
321-328
EN
We present an overview of the factors affecting soft magnetic properties, fast domain wall propagation and giant magnetoimpedance (GMI) effect in thin amorphous wires. The magnetoelastic anisotropy is one of the most important parameters that determine the magnetic properties of glass-coated microwires and therefore annealing can be very effective for manipulation the magnetic properties of amorphous ferromagnetic glass-coated microwires. Increasing of DW velocity in Fe-rich and Fe-Ni based (low Ni content) microwires is achieved after annealing. After heat treatment of Co-rich microwires we can observe transformation of inclined hysteresis loops to rectangular and coexistence of fast magnetization switching and GMI effect in the same sample. On the other hand stress annealing of Fe- and Co-rich microwires allows achievement of considerable magnetic softening and GMI effect enhancement.
7
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Ni_2FeSi Heusler Glass Coated Microwires

73%
Galdun L., Ryba T., Prida V., Hernando B., Zhukova V., Zhukov A., Vargová Z., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
851-853
EN
We report on fabrication, structural and magnetic properties of novel Heusler-type glass coated Ni₂FeSi microwires that were prepared by the Taylor-Ulitovsky method, having a metallic nucleus diameter about 3.9 μm and total sample diameter of 39 μm. This single step and low cost fabrication technique offers to prepare up to km of glass-coated microwires starting from few g of cheap elements for diverse applications. The X-ray diffraction data from the metallic nucleus indicates L2₁ crystalline structure (a=5.563 Å), with a possible DO3 disorder. Magnetic measurements determined the Curie temperature well above the room temperature (770 K) together with uniform easy magnetization axis of the metallic core, which predisposes this material to a suitable candidate for spintronic applications.
8
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Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy

73%
Mino J., Ipatov M., Gamcova J., Saksl K., Durisin M., Zhukova V., Vargova Z., Zhukov A., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1075-1077
EN
Ribbons of composition Co₄₉Ni₂Ga₃₀ have been prepared by melt-spinning method. X-ray diffraction investigation revealed single phase with B2 structure at room temperature. However, analysis of magnetization dependence of temperature suggests phase transition in the range 150-250 K. Resistivity measurements revealed similar transition with shift to higher temperatures in the presence of magnetic field.
9
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Magnetic Properties and Giant Magnetoimpedance in Amorphous and Nanocrystalline Microwires

59%
Talaat A., Zhukova V., Ipatov M., Blanco J., Churyukanova M., Kaloshkin S., Kostitcyna E., Shuvaeva E., Gonzalez-Legarreta L., Hernando B., Zhukov A.
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vol. 126
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issue 1
146-147
EN
We studied magnetic properties and GMI effect of Finemet-type FeCuNbSiB microwires. We observed that GMI effect and magnetic softness of microwires produced by the Taylor-Ulitovski technique, can be tailored by either controlling magnetoelastic anisotropy of as-prepared FeCuNbSiB microwires or controlling their structure by heat treatment or changing the fabrication conditions. GMI effect has been observed in as-prepared Fe-rich microwires with nanocrystalline structure.
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