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    Wyświetlanie 1-8 z 8
    Tytuł:
    Structural Investigation of Rapidly Quenched FeCoPtB Alloys
    Autorzy:
    Grabias, A.
    Latuch, J.
    Oleszak, D.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506648.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.50.Kj
    76.80.+y
    Opis:
    Two sets of $Fe_{52-x}Co_{x}Pt_{28}B_{20}$ (x=0-26 at.%) and $Fe_{60-x}Co_{x}Pt_{25}B_{15}$ (x=0-40 at.%) alloys were prepared in the form of ribbons by the rapid quenching technique. Structure of the samples was characterized by Mössbauer spectroscopy and X-ray diffraction. In the as-quenched alloys the amorphous phase coexisted with the fcc-(Fe,Co)Pt disordered solid solution. Differential scanning calorimetry measurements performed in the range 50-720 °C revealed one or two exothermal peaks. The magnetically hard ordered $L1_{0}$ (Fe,Co)Pt and magnetically soft $(Fe,Co)_{2}B$ nanocrystalline phases were formed due to thermal treatment of the alloys. The influence of Co content on the structure of the as-quenched and heated alloys was studied.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 68-71
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $\text{}^{57}Fe$ Mössbauer Spectroscopy οf Radiation Damaged Allanites
    Autorzy:
    Malczewski, D.
    Grabias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811896.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.82.Fd
    64.60.My
    76.80.+y
    Opis:
    Metamict minerals contain radioactive elements that degrade the crystal structure of the minerals. The degradation occurs primarily through progressive overlapping recoil nuclei collision cascades from α-decays of $\text{}^{238}U$, $\text{}^{232}Th$, $\text{}^{235}U$ and their daughter products. We report the results of $\text{}^{57}Fe$ Mössbauer spectroscopy, gamma-ray spectrometry and microprobe analysis of three partially metamict allanites, $(Ca,Ce,REE)_2(Fe^{2+},Fe^{3+})$$(Al,Fe^{3+})_2O[Si_2O_7][SiO_4](OH)$ where REE stands for rare earth elements. The samples were collected in pegmatites from Reno, Nevada (USA), Franklin, New Jersey (USA) and Nya Bastnas Field (Sweden). The absorbed α-dose for these minerals was found to range from $5.8×10^{14}$ α-decay/mg for the allanite from Reno to $1.9×10^{15}$ α-decay/mg for the allanite from Franklin. The Mössbauer spectra show a decrease in the $Fe^{2+}$ doublet intensity with increasing absorbed α-dose. We also observe an increase in the line widths of the $Fe^{2+}$ and $Fe^{3+}$ doublets with increasing absorbed α-dose.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1683-1690
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission and Conversion Electron Mössbauer Study of Crystallization of Amorphous FeZrB Alloys
    Autorzy:
    Grabias, A.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011003.pdf
    Data publikacji:
    1999-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.50.Kj
    75.50.Bb
    81.40.-z
    Opis:
    The combined conversion electron emission and γ-transmission Mössbauer spectroscopy are used to investigate the differences in the bulk and surface crystallization of the amorphous FeZrB alloy in which the nanocrystalline bcc-Fe phase was formed due to annealing. The measurements were performed for the ribbons in the as-quenched state, after 1 h annealing at 430-600°C and after short time annealing at 600°C. The clear differences in the surface and bulk crystallization behaviours were detected. Not only the surface crystallization starts at lower annealing temperature than the bulk one, but additional phases were detected at the surface which do not form in the bulk. Structural transformations as a function of annealing time (15-120 s) are compared with those induced by 1 h anneals. The enhanced surface crystallization was attributed to the boron depletion of the surface region which leads to the decrease in the crystallization temperature at the surface.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 1; 123-130
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Temperature and Annealing on GMR in Sputtered Permalloy/Cu Multilayers
    Autorzy:
    Urbaniak, M.
    Stobiecki, F.
    Luciński, T.
    Kopcewicz, M.
    Grabias, A.
    Aleksiejew, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013168.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    75.70.Pa
    Opis:
    The influence of temperature and annealing on giant magnetoresistance of Si(100)/Cu(20 nm)/Py(2 nm)/(Cu(2 nm)/Py(2 nm))$\text{}_{100}$ multilayer (Py = Ni$\text{}_{83}$Fe$\text{}_{17}$) sputtered at room temperature in double face-to-face configuration is reported. It was found that giant magnetoresistance value, ΔR$\text{}_{GMR}$/R$\text{}_{sat}$ (where R$\text{}_{sat}$ is the resistance in saturation), monotonically decreases with increasing temperature (4.5% at 173 K to about 1% at 373 K). This results from the decrease in magnetic change of resistance, ΔR$\text{}_{GMR}$, and to the lesser extent from an increase in R$\text{}_{sat}$, though both of them are caused by the shortening of electrons mean free path. The observed almost linear decrease in giant magnetoresistance saturation field with increasing temperature is explained by temperature changes of magnetization profile. Vibrating sample magnetometer measurements revealed that the increase in temperature results in pronounced decrease in remnant to saturation magnetization ratio (M$\text{}_{r}$/M$\text{}_{s}$) suggesting that at low temperatures magnetic bridges between Py layers play an important role in magnetization process. It is shown that proper annealing, by an annihilation of bridges and/or lateral decoupling, leads to an increase in giant magnetoresistance ratio from 3.4% in as deposited state to 4.7%.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 539-542
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Magnetic Structure of Strongly Coupled Fe/Si Multilayers
    Autorzy:
    Dubowik, J.
    Stobiecki, F.
    Szymański, B.
    Kudryavtsev, Yu. V.
    Grabias, A.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013056.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    76.50.+g
    Opis:
    Fe/Si multilayers with strong bilinear and biquadratic couplings were investigated. A complex structure revealed by the Mössbauer spectroscopy corresponds to multimode ferromagnetic resonance spectra in a non-saturated state. Simple dispersion relations for antiferromagnetic coupled bilayer structures are shown to be inapplicable to the Fe/Si multilayers with a strong biquadratic component to the antiferromagnetic bilinear coupling.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 451-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CEMS and RF-Mössbauer Study of Nanocrystalline Fe$\text{}_{81}$Zr$\text{}_{7}$B$\text{}_{12}$ Alloy
    Autorzy:
    Kopcewicz, M.
    Grabias, A.
    Nowicki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953186.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    81.40.-z
    75.50.Bb
    75.50.Kj
    Opis:
    The combined conversion electron (CEMS) and γ-transmission Mossbauer spectroscopy is used to investigate the differences in the bulk and surface crystallization of the amorphous Fe$\text{}_{81}$Zr$\text{}_{7}$B$\text{}_{12}$ alloy. The radio-frequency induced effects (rf collapse and side bands) are used to study the microstructure and magnetic behaviour of the alloy in the amorphous and nanocrystalline states. Rf-Mossbauer experiment permits us to distinguish soft magnetic nanocrystalline bcc-Fe phase from microcrystalline α-Fe.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 225-228
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon-Encapsulated Magnetic Nanoparticles Based on Fe, Mn, and Cr for Spintronics Applications
    Autorzy:
    Szczytko, J.
    Osewski, P.
    Bystrzejewski, M.
    Borysiuk, J.
    Grabias, A.
    Huczko, A.
    Lange, H.
    Majhofer, A.
    Twardowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047686.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.75.+a
    75.20.En
    75.30.Cr
    75.50.Bb
    Opis:
    We succeeded in the arc-plasma synthesis of carbon-encapsulated Fe, Cr, and Mn-based nanoparticles. The transmission electron microscopy, Mössbauer spectra (of iron) and SQUID magnetometry results demonstrate that the products of the synthesis contain metals and its carbides. The nanoparticles show ferromagnetic or superparamagnetic behavior at high temperatures, which is demanded for nano-spintronics applications.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 305-310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Study of Magnetic Properties of $Fe_{80-x}Co_{x}Zr_7Si_{13}$ (x = 0-30~at.%) Boron-Free Amorphous Alloys
    Autorzy:
    Kopcewicz, M.
    Grabias, A.
    Latuch, J.
    Ferenc, J.
    Żuberek, R.
    Nesteruk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428677.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.-d
    76.80.+y
    82.80.Ej
    Opis:
    Amorphous $Fe_{80-x}Co_{x}Zr_7Si_{13}$ (x = 0-30 at.%) alloys in which boron was completely replaced by silicon as a glass forming element have been prepared by melt quenching. Partial substitution of iron by cobalt caused the increase of the hyperfine field and saturation magnetization. The specialized rf-Mössbauer measurements revealed that all amorphous alloys studied are magnetically very soft. The rf-sidebands effect, related to magnetostriction, increases with the increase of Co content. In $Fe_{50}Co_{30}Zr_7Si_{13}$ sample the rf field exposure induced partial crystallization of amorphous phase that was attributed to mechanical deformations related to high frequency magnetostrictive vibrations induced by the rf field. The measurements of the hysteresis loop revealed that coercivity increases for higher Co content.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1257-1260
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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