Temat: 75.78.Jp - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ultrafast Magnetization Dynamics in Epitaxial Ni-Mn-Sn Heusler Alloy Film
Autorzy:: Bonda, A.
Uba, S.
Załęski, K.
Dubowik, J.
Uba, L.
Powiązania:: https://bibliotekanauki.pl/articles/1030478.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.78.Jp
75.50.-y
78.47.J-
75.30.-m
06.60.Jn
75.40.Gb
Opis:: The work is devoted to studies of ultrafast magnetization dynamics induced by femtosecond laser pulses in ferromagnetic Ni-Mn-Sn shape memory Heusler alloy. We studied epitaxial thin Ni_{54.3}Mn_{31.9}Sn_{13.8} film deposited on (001) MgO substrate. Spin precession in an external magnetic field was triggered and detected by the time-resolved magneto-optical Kerr effect (TRMOKE) using pump-probe technique in dual color scheme experiment. Measurements were performed as a function of magnetic field H and pulse power P. The measured TRMOKE signal is composed of oscillatory and background components, both decaying exponentially in a nanosecond time scale. The precession frequency was determined and found to be varying in the range of 1-10 GHz with H up to 3 kOe and decreasing linearly with P. The dependence of Gilbert damping parameter α on H was determined and discussed.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 501-504
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses
Autorzy:: Nakajima, M.
Yamaguchi, K.
Suemoto, T.
Powiązania:: https://bibliotekanauki.pl/articles/1489996.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.78.Jp
42.50.Md
76.50.+g
78.20.Ls
Opis:: We demonstrated coherent control of spin precession motion due to the ferromagnetic resonance induced by magnetic field component of ultrashort terahertz pulses. The amplitude of the precession can be controlled by the pulse separation time of the double pulse excitation technique. We succeeded in observing the energy transfer between spin and photon systems, and the energy of the spin system is returned to the second terahertz pulses instantaneously when the precession amplitude is cancelled.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 343-346
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Theory of Ultrafast Demagnetization after Femtosecond Laser Pulses
Autorzy:: Fähnle, M.
Illg, Ch.
Haag, M.
Teeny, N.
Powiązania:: https://bibliotekanauki.pl/articles/1384049.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.78.Jp
75.30.Ds
75.40.Gb
Opis:: Experimentally it has been found that a ferromagnetic metallic film is strongly demagnetized within few hundred fs after exposure to a fs laser pulse. The theories of this ultrafast demagnetization are reviewed, especially the influence of scatterings of the excited electrons at phonons and at magnons. The calculations for phonons and magnons are performed by the ab initio spin-density-functional electron theory for Ni and Fe, and they are based on Fermi's golden rule for transition rates. The application of this rule on the fs time scale is critically discussed in view of results from quantum-kinetic density-matrix calculations. It is shown that the experimentally observed demagnetization rates cannot be explained by spin-flip scatterings of electrons exclusively at phonons or exclusively at magnons. A combination of individual spin-flip electron-phonon and spin-flip electron-magnon processes is shown to be a potential candidate for the explanation of ultrafast demagnetization.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 170-175
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Temperature Dependence of Magnetization Damping in Heusler Alloy Films
Autorzy:: Dubowik, J.
Załęski, M.
Głowiński, H.
Gościańska, I.
Powiązania:: https://bibliotekanauki.pl/articles/1534143.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.50.+g
75.70.Ak
75.78.Jp
Opis:: The Gilbert damping for $Co_2CrAl (Co_2Cr_{0.3}Fe_{0.7}Al)$ and $Ni_2MnSn$ Heusler alloy films was investigated as a function of temperature. The best films reveals the Gilbert damping nearly independent of temperature. Magnetic relaxation in $Co_2CrAl$ is strongly influenced by magnetic inhomogeneities due to phase separation. The best $Ni_2MnSn$ epitaxial films have comparable Gilbert damping α of 6× $10^{-3}$ as half-metallic $Co_2Cr_{0.3}Fe_{0.7}Al$ films with α = 3 × $10^{-3}$.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 848-850
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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