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Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co_{66}Fe_{4}Mo_{2}Si_{16}B_{12} Alloy

100%
Garcia Tello P., González J., Blanco J., Żuberek R.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
595-598
EN
The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co_{66}Fe_{4}Mo_{2}Si_{16}B_{12} alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5×10^{-8}) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).
2
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Tailoring of Magnetic Properties and Magnetoimpedance Effect in Thin Amorphous Wires

88%
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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Magnetocaloric Effect in Nanostructured Pr_2Fe_{17} and Nd_2Fe_{17} Synthesized by High-Energy Ball-Milling

76%
Alvarez P., Sánchez-Marcos J., Sanchez Llamazares J., Franco V., Reiffers M., Blanco J., Gorria P.
Acta Physica Polonica A
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2010
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vol. 118
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issue 5
867-869
EN
Nanocrystalline Pr_2Fe_{17} and Nd_2Fe_{17} powders with rhombohedral Th_2Zn_{17}-type crystal structure and average particle sizes around 20 nm have been obtained by high-energy ball milling. While the bulk alloys show a well-defined and sharp drop in the low-field magnetization curve at the Curie temperature, T_{C} = 285 K (Pr) and 335 K (Nd), the ball-milled samples exhibit a substantial broadening of the ferro-to-paramagnetic transition due to a considerable augmentation of the disordered inter-grain boundaries. The latter results in an increase of more than 25% in the values of the full width at half maximum of the temperature dependence of the magnetic entropy change maintaining almost unchanged the relative cooling power.
4
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Fast Magnetization Switching in Amorphous Microwires

76%
Zhukov A., Ipatov M., Blanco J., Chizhik A., Talaat A., Zhukova V.
Acta Physica Polonica A
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2014
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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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Point-Contact Spectroscopy of Ce_{1-x}RE_{x}Ni_{5} (RE = Pr, Nd)

76%
Kačmárová T., Reiffers M., Garcia Soldevilla J., Goméz Sal J., Espeso J., Blanco J.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
795-798
EN
We report on the study of the electron-quasiparticle interaction function in Ce_{1-x}RE_{x} Ni_{5} (RE = Pr, Nd) pseudobinary compounds for x = 0, 0.2, 0.5, 0.8, and 1 measured by means of point-contact spectroscopy. The measured point-contact spectra (d^{2}V/dI^{2} - directly proportional to the electron- quasiparticle interaction function) of the heterocontacts between Ce_{1-x} RE_{x}Ni_{5} and Cu in the ballistic regime are presented.
6
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Engineering of Magnetic Properties of Magnetic Microwires

76%
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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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.
Acta Physica Polonica A
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2014
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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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