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The Study of Magnetization Process in Amorphous FeNiSiB Microwires

100%
Gamcova J., Varga R., Hernando B., Zhukov A.
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issue 5
807-808
EN
We have studied the magnetization process in amorphous Fe_{49.6}Ni_{27.9}Si_{7.5}B_{15} microwire. It was found that the hysteresis mechanism consists of two contributions: magnetoelastic and structural relaxation. It was shown that at low frequencies, the magnetization process is controlled mainly by the structural relaxation. At higher frequencies (above 50 Hz), the relaxation effect disappears and switching field is determined mainly by the magnetoelastic contribution. Moreover, the effect of thermal treatment at temperature 300°C has been studied. As-cast microwire is almost unsensible to the applied tensile stress since the applied stresses are lower than that induced during production. After annealing, the stresses relax and stress sensibility of microwires increases.
2
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Influence of Mn Doping on Magnetic and Structural Properties of Co₂FeSi Heusler Alloy

76%
Galdun L., Ryba T., Kováč J., Prida V., Hernando B., 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
866-868
EN
We have studied the effect of Mn doping on structural and magnetic properties of Co₂FeSi Heusler alloy. Co₂FeSi, Co₂Mn_{0.25}Fe_{0.75}Si and Co₂Mn_{0.5}Fe_{0.5}Si alloys were prepared by melt spinning technique which offers fast and simple production of large amount of materials in a single production step. The rapid quenching method provides an opportunity to prepare Heusler alloys with highly ordered L2₁ structure confirmed by X-ray analysis in all the samples. Magnetic measurements revealed high Curie temperatures (>1000 K) and well defined easy magnetization plane parallel with the ribbon plane. Those attributes predispose given samples for applications in spintronics.
3
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Directional Ordering in Amorphous Fe_{43}Ni_{43}Zr_7Cu_1B_6 Ferromagnetic Alloys

76%
Varga M., Varga R., Vojtaník P., Hernando B., Prida V., Santos J., Pérez M.
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issue 5
804-806
EN
Development of the atomic directional ordering in the Fe_{43}Ni_{43}Zr_7Cu_1B_6 alloy, during its conventional the same as after transverse magnetic field annealing, was experimentally studied by the amplitude dependence of susceptibility and hysteresis loops measurements, respectively. Diffusion processes of the mobile atoms caused perminvar effect, decrease of the initial susceptibility, increase of the critical field, and linear shape of the hysteresis loop. Uniaxial magnetic anisotropy, created during magnetic field annealing of the FeNiZrCuB alloy, was confirmed also by observation of the surface domain structure.
4
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Susceptibility Spectroscopy in FeNiSiB Microwires

64%
Olivera J., Gamcova J., Varga R., Santos J., Prida V., Sanchez M., Hernando B., Zhukov A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
155-158
EN
Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated Fe_{77.5-x}Ni_xSi_{7.5}B_{15} (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.
5
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Ni_2FeSi Heusler Glass Coated Microwires

64%
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.
6
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Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

64%
Prida V. M., Salaheldeen M., Pfitzer G., Hidalgo A., Vega V., González S., Teixeira J., Fernández A., Hernando B.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
822-827
EN
The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.
7
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Off-Diagonal Magnetoimpedance Dependence of Magnetostriction and Anisotropy in Co-Based and Fe-Based Amorphous Ribbons

64%
Sánchez T., García J., Santos J., Escoda L., Prida V., Sánchez M., Suñol J., Hernando B.
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issue 5
756-758
EN
The object of this work is the comparison of domain structure and off-diagonal magnetoimpedance effect in amorphous ribbons with different magnetostriction coefficient. The Co_{66}Fe_4Ni_1Si_{15}B_{14} and Fe_{80}B_{20} samples were obtained by melt-spinning. During the quenching procedure a 0.07 T transverse magnetic field was applied to some of the samples. Domain patterns obtained by the Bitter technique confirm that the differences on the samples are related to the different anisotropy and magnetostriction coefficient, and the quenching procedure. Small changes on the anisotropy distribution and the magnetostriction coefficient can be detected by the off-diagonal impedance spectra as a consequence of the different permeability values of the samples.
8
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Magnetic Properties and Giant Magnetoimpedance in Amorphous and Nanocrystalline Microwires

52%
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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