Autor: Gzik-Szumiata, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modeling of Magnetic Hyperfine Field Distribution for Spherical Nanoparticles of bcc Structure
Autorzy:: Szumiata, T.
Gzik-Szumiata, M.
Brzózka, K.
Gawroński, M.
Górka, B.
Powiązania:: https://bibliotekanauki.pl/articles/1813877.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.67.Bf
76.80.+y
Opis:: We propose a simple model for temperature evolution of magnetic hyperfine field distribution of spherical bcc Fe nanoparticles. We performed mean field approximation calculations of mean spin value in each spherical shell of nanoparticle. Considering magnetic hyperfine field values reported for iron thin films we predicted possible values of hyperfine fields in the internal and surface region of the particles as a function of temperature.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 537-540
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Magnetism and structure evolution in Ni-Zn ferrites thin films - CEMS study
Autorzy:: Szumiata, T.
Gzik-Szumiata, M.
Brzózka, K.
Górka, B.
Gawroński, M.
Javed, A.
Farman, K.
Fatima, T.
Powiązania:: https://bibliotekanauki.pl/articles/1054837.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.80.+y
81.15.Fg
81.05.Je
Opis:: In this work, a ⁵⁷Fe conversion electron Mössbauer spectrometry and X-ray diffraction have been utilized in order to investigate the structural and magnetic order in 500 nm thick Ni-Zn ferrite films deposited on Si(100) substrate by laser ablation. Considering the contributions of the conversion electron Mössbauer subspectra corresponding to the tetrahedral (A) and octahedral (B) sites, the spinel inversion parameter in [Zn_{x}Fe_{1-x}]^{A}[Ni_{1-x}Fe_{1+x}]^{B}O₄ films has been estimated. The hyperfine field (B_{hf}) values in the investigated Ni-Zn ferrites thin films are about 5-8% smaller than those of bulk ferrites, which could be a sign of thermal magnetic relaxations due to the size effects. The distribution of hyperfine magnetic field directions was found to be affected by perpendicular anisotropy.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 836-838
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder
Autorzy:: Szumiata, T.
Gzik-Szumiata, M.
Brzózka, K.
Gawroński, M.
Górka, B.
Kollár, P.
Olekšáková, D.
Polański, K.
Szmaja, W.
Powiązania:: https://bibliotekanauki.pl/articles/1810615.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.80.+y
75.50.Bb
75.60.Ej
81.20.Ev
Opis:: Magnetic and structural studies were performed on $Fe_{50}Co_{50}$ material. The samples (disk-shaped, diameter: 10 mm, thickness: 2.5 mm) were fabricated by compaction of powder under pressure of 800 MPa for 5 min at temperatures 300-600°C. The powder was obtained by milling of $Fe_{50}Co_{50}$ alloy swarfs in high-energy planetary mill. The milling time varied from 1 h to 40 h. In the course of milling process the mean size of alloy pieces was decreasing from about 0.5 mm to 0.05 mm (scanning electron microscopy), which provided more compact structure after compression. The annealing process during compaction strongly reduces a coercive field of the samples. Parameters of conversion electron Mössbauer spectra are almost the same for all samples, which points to not significant changes of atomic and magnetic order after milling and compacting.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 403-405
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Mössbauer and Magnetic Study of Fe+Vitroperm+Plastic System
Autorzy:: Brzózka, K.
Kollár, P.
Szumiata, T.
Sovak, P.
Füzer, J.
Fáberová, M.
Bureš, R.
Górka, B.
Gawroński, M.
Gzik-Szumiata, M.
Powiązania:: https://bibliotekanauki.pl/articles/1201075.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Bb
68.35.bd
76.80.+y
75.60.-d
72.80.Tm
Opis:: Phase composition and magnetization curves of the soft magnetic composites, fabricated by compaction of several kinds of powders mixed in various proportions, have been investigated by means of conversion electron Mössbauer spectroscopy and an alternating gradient force magnetometry. The results point to significant quantity of iron oxides - hematite and magnetite - at the surface of the samples. After the rubbing of thin surface layer, the relative content of oxides was distinctly reduced. Magnetic measurements revealed very similar characteristics of hysteresis curves for all the investigated materials.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 148-149
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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