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    Wyświetlanie 1-5 z 5
    Tytuł:
    Preferentially Oriented Growth of L1₀ FePt on Si Substrate
    Autorzy:
    Kaushik, N.
    Sharma, P.
    Tanaka, S.
    Makino, A.
    Esashi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387798.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.En
    75.50.Ss
    75.50.Vv
    75.70.Ak
    Opis:
    Tilting the magnetic easy axis of L1₀ FePt and/or introducing a magnetic buffer layer is most effective in realizing the L1₀ based magnetic recording media. Here we report on preferentially oriented growth of L1₀ FePt with tilted magnetic easy axis. FePt films of thickness up to 170 nm were deposited on Si substrate with a soft magnetic underlayer of glassy FeSiB, FeSiBP and CoFeTaB. Effects of processing conditions on the structural and magnetic properties were studied. A polycrystalline growth of FePt (i.e. mixed orientation) was observed with the underlayer of FeSiB and FeSiBP, but CoFeTaB promotes preferentially oriented growth along (111) crystallographic direction. Compared to FePt films grown on Si substrate, coercivity $(H_{c})$ reduces significantly with the introduction of soft magnetic underlayer. The magnetic easy axis of (111) L1₀ FePt is tilted 36 out of plane and it is very promising for tilted magnetic recording media.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 611-613
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cu²⁺ Ion Irradiation on Microstructure of Er₂O₃ Coating Layer Formed by MOCVD Method
    Autorzy:
    Tanaka, M.
    Takezawa, M.
    Hishinuma, Y.
    Tanaka, T.
    Muroga, T.
    Ikeno, S.
    Lee, S.
    Matsuda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032912.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    nuclear fusion
    coating
    Er2O3
    thin film
    TEM
    SEM and XRD
    Opis:
    Erbium oxide (Er₂O₃) coating is one of the promising methods to restrict tritium permeation and the magneto hydrodynamic pressure drop for advanced breeding blanket systems. Er₂O₃ coating layer on large interior surface area of metal pipe is deposited by using metal organic chemical vapor deposition process. In this work, the influence of Cu²⁺ ion irradiation on microstructure of Er₂O₃ coating layer on stainless steel 316 (SUS 316) substrate by metal organic chemical vapor deposition methods was investigated using scanning electron microscopy, transmission electron microscopy observation and X-ray diffraction analysis. Microstructure observation of Er₂O₃ coating was carried out after 0.00-1.50 dpa Cu²⁺ ion irradiation at 298 K and 773 K. Scanning electron microscopy observation of the surface area on Er₂O₃ thin film revealed the crack generation on surface after Cu²⁺ ion irradiation. X-ray diffraction peaks were identified in Er₂O₃ after Cu²⁺ ion irradiation transmission electron microscopy observations, the formation of interlayer between Er₂O₃ coating and SUS substrate was confirmed. According to transmission electron microscopy-energy dispersive spectroscopy, the interlayer includes Fe and Cr.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1351-1352
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tsai-Type Quasicrystal and Its Approximant in Au-Al-Tm Alloys
    Autorzy:
    Tanaka, K.
    Tanaka, Y.
    Ishimasa, T.
    Nakayama, M.
    Matsukawa, S.
    Deguchi, K.
    Sato, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373678.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.44.Br
    Opis:
    A P-type icosahedral quasicrystal with a six-dimensional lattice parameter $a_{6D}$ = 7.411 Å is formed as an equilibrium phase in Au-Al-Tm alloy, of which composition was analyzed to be $Au_{46}Al_{38}Tm_{16}$ by electron probe microanalysis. This quasicrystal is observed as a predominant phase in both as-cast and $Au_{49}Al_{34}Tm_{17}$ alloys annealed at 910°C, and as one of main phases in the alloy slowly cooled from 1020°C. A 1/1 approximant, $Au_{48}Al_{38}Tm_{14}$, is also formed near the composition of the quasicrystal. This is a body-centered cubic structure (space group: Im3̅) with a lattice parameter a = 14.458 Å that is an isostructure to the recently reported 1/1 Tsai-type approximant in Au-Al-Yb. This approximant is characterized by disorderly arranged four Au-Al atoms centered at the Tsai-type cluster, presence of atoms at 8c site, and chemical ordering of Au and Al at sites forming a partial triacontahedron.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 603-607
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Properties of the Au-Al-Yb Quasicrystal and Approximant under Hydrostatic Pressure
    Autorzy:
    Matsukawa, S.
    Tanaka, K.
    Nakayama, M.
    Kunikata, S.
    Deguchi, K.
    Imura, K.
    Ishimasa, T.
    Sato, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373322.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    72.15.Eb
    75.50.Kj
    Opis:
    The mixed-valence Au-Al-Yb quasicrystal exhibits unusual quantum criticality. Its crystalline approximant behaves like a conventional heavy fermion metal. Due to these novel features, they have attracted much attention recently. To examine the sample dependence of this new type of materials, we have prepared several samples and measured the electrical resistivity both at ambient and high pressures as well as the magnetic susceptibility at ambient pressure. The residual resistivity ratio of the quasicrystals is almost sample independent while the power law exponent n of the electrical resistivity varies from sample to sample. The effective magnetic moment $p_{eff}$ of the quasicrystals is also sample dependent, ranging from about 3.4 to 3.9 $μ_{B}$/Yb, and these values are all smaller than the free $Yb^{3+}$ ion value, confirming the mixed-valence nature. Although the magnitude of n and $p_{eff}$ is sample-dependent, the principal feature of the mixed-valence is confirmed in all the samples studied thus far. A combination of these results indicates correlation between n and $p_{eff}$, suggesting that the 4f electrons may contribute to a scattering mechanism of the conduction electrons. External pressure increases the magnitude of the electrical resistivity and decreases the index n of both the quasicrystal and the approximant. Up to the highest pressure measured in the present study no experimental evidence for a phase transition was found.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 527-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slow Dynamics of the Photoinduced Phase Transition in $Pd(dmit)_2$ Salts (dmit = 1,3-dithiol-2-thione-4,5-dithiolate)
    Autorzy:
    Ishikawa, T.
    Tanaka, T.
    Fukazawa, N.
    Matsubara, Y.
    Okimoto, Y.
    Onda, K.
    Koshihara, S.
    Tamura, M.
    Kato, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408855.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Me
    78.47.D-
    78.47.jg
    78.55.Kz
    78.66.Qn
    Opis:
    Slow dynamics of the initially photoinduced state has been observed by the pump-probe type time-resolved reflection spectroscopy in the charge separated phase of the half-filled strong dimer system, $Et_2Me_2Sb[Pd(dmit)_2]_2$ (dmit = 1,3-dithiol-2-thione-4,5-dithiolate). We have succeeded to reproduce the probe photon energy dependence of the time profile qualitatively in the time delay range from 10 ps to 1 ns assuming the dynamical expansion of the domain of the photo-induced dimer-Mott insulating phase in the host charge-separated one.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; 316-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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