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    Tytuł:
    Pecularities of p-d Interaction in Semimagnetic Semiconductors with Cr$\text{}^{2+1}$
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890686.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.-m
    71.70.-d
    Opis:
    In cubic DMS crystals with Cr$\text{}^{2+}$ content the non-Heisenberg part of the p-d interaction together with the strong, static Jahn-Teller effect may lead to a zero-magnetic field splitting and significant modifications of the spin splittings for the valence band. The effect reaches a maximum when all Jahn-Teller distortions are oriented along one of the [100]-type crystallographic directions.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 295-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Dependent Interaction of a Band Electron with Paramagnetic Impurities
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1879507.pdf
    Data publikacji:
    1991-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.-m
    71.70.-d
    Opis:
    A band electron interacting with N electrons in a d-shell of a paramagnetic impurity in zinc-blende type semiconductors was considered. The hybridization of band and d-states in the crystal field and the nonorthogonality mechanisms of interaction were examined in addition to the standard direct exchange. The Heisenberg-type form was derived for the interaction between a Γ$\text{}_{8}$-electron and an impurity with a half-filled d-shell. The domination of the hybridization mechanism explains the observed sign of the effective exchange constant for Γ$\text{}_{8}$ electrons in diluted magnetic semiconductors (DMS) and the difference in magnitude of this constant for Mn$\text{}^{2+}$ and Fe$\text{}^{3+}$ ions in HgSe.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 1; 145-148
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Ferromagnetic p-d Exchange in Diluted Magnetic Semiconductors
    Autorzy:
    Blinowski, J.
    Dietl, T.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921558.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.-m
    71.70.-d
    Opis:
    The antiferromagnetic type of the interaction between the Γ$\text{}_{8}$-band electrons and the Mn$\text{}^{2+}$ ions in A$\text{}^{II}$B$\text{}^{IV}$ diluted magnetic semiconductors has been explained by invoking the p-d hybridization mechanism. In this paper it is shown that for particular electronic configurations of the magnetic ions in diluted magnetic semiconductors the p-d hybridization can lead to a ferromagnetic interaction between the valence-band electrons and the localized spins. This happens when all the one-electron d-orbitals which hybridize with p-band states are empty (e.g., as in Sc$\text{}^{2+}$ and Ti$\text{}^{2+}$ ions). The appropriate p-d Hamiltonian is derived and the ferromagnetic exchange constants are evaluated.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 641-644
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic Exchange in Diluted Magnetic Semiconductors of Wurtzite Structure
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929720.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.-m
    Opis:
    Kinetic exchange between valence electrons and paramagnetic ions in diluted magnetic semiconductors of wurtzite structure is examined and compared with the results obtained previously for zinc-blende type diluted magnetic semiconductors. Two limiting electron configurations of the impurity ion, d$\text{}^{5}$ and d$\text{}^{1}$, are discussed. For the former, it is shown that the exchange constant anisotropy, experimentally observed in CdMnSe, results from the anisotropy of the hybridization matrix elements. In the latter case, apart from the similar anisotropy of the ferromagnetic exchange constant, additional, antiferromagnetic corrections should be expected, since for this particular symmetry the hybridization between the ground state of the ion and valence band becomes allowed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 693-696
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetism in Cr-Based Diluted Magnetic Semiconductors
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Majewski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933725.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Gm
    75.50.Pp
    75.50.Dd
    Opis:
    It has been recently established that in zinc chalcogenides with Cr$\text{}^{2+}$ paramagnetic ions the p-d interactions are ferromagnetic. We clarify the origins of this property and make predictions concerning other Cr-based diluted magnetic semiconductors. The observation of the ferromagnetic p-d interaction resuscitated hopes for ferromagnetic d-d exchange interactions in diluted magnetic semiconductors. We have calculated the nearest-neighbor superexchange integrals in Cr-based diluted magnetic semiconductors. No simple correlation between the signs of p-d and d-d interactions has been found. Still, there are extended energy regions where the calculated superexchange is ferromagnetic and the act ual parameters of DMS with Cr$\text{}^{2+}$ seem to match these regions.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 683-686
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superexchange in A$\text{}^{II}$B$\text{}^{VI}$ Diluted Magnetic Semiconductors with Mn, Fe and Co Ions
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877065.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.-m
    Opis:
    A theory of superexchange, the dominant ion-ion spin interaction, for Mn-, Fe- and Co-based DMS is presented. The theory takes into account the band structure of A$\text{}^{II}$B$\text{}^{VI}$ compounds, the orbital dependence of the hybridization and the intra shell correlations of the d-electrons, which are essential in the case of the non-S-state ions. The general formulae relating the superexchange to the band structure and the ionic energy spectrum were obtained - the dominant part of the superexchange turns out to be inversely proportional to the square of the ionic spin. This explains the observed increase in the average values of d-d exchange constants, when passing from Mn via Fe to Co ions in DMS.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 539-542
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Double Exchange in Mixed-Valency Diluted Magnetic Semiconductors
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1947969.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Gm
    75.30.Et
    Opis:
    The role of double-exchange, a non-Heisenberg spin-spin interaction between the magnetic ions of identical chemical nature but different charge states, in the mixed-valency diluted magnetic semiconductors is discussed. The mechanism correlates the spins of magnetic ions by virtual hopping of a d-electron from one ion to the other via the p-band states. We calculate the energy spectrum for pairs of magnetic ions within the charged ionic clusters stabilized by the charge-charge correlations, taking into account simultaneously both the double and the superexchange. The ferromagnetic, non-Heisenberg double exchange might compete with the Heisenberg-like, ferrimagnetic superexchange, thus resulting in canted alignments of ionic spins.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 731-734
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations in Magnetic-Nonmagnetic Semiconductor Superlattices - Simple Model
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968017.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.70.Ak
    Opis:
    The magnetic interactions in superlattices formed by alternating layers of magnetic and nonmagnetic semiconductors with common anions were studied theoretically. Within a one-dimensional tight-binding model by minimising the total electronic energy we show the existence of an efficient long range mechanism of magnetic correlations between the neighbouring magnetic layers in such superlattices. The cases of magnetic ions in the barriers (e.g., EuTe/PbTe) and in the wells, with the order within the magnetic layers being either ferromagnetic or antiferromagnetic, have been considered and compared with the paramagnetic case. In the case of antiferromagnetic ordering within magnetic layers we have found that for even and odd numbers of magnetic monolayers different magnetic superlattices are energetically favourable.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 719-723
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Kinetic Exchange in A$\text{}^{III}$B$\text{}^{V}$ Diluted Magnetic Semiconductors
    Autorzy:
    Blinowski, J.
    Kacman, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027499.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Gm
    75.50.Dd
    75.30.Et
    Opis:
    In the case of II-VI diluted magnetic compounds it was shown that the kinetic exchange mechanism depends crucially on the electronic configuration of the magnetic ions and the charge transfer energies for the transitions from the band onto the magnetic ion and vice versa. In the present paper we analyze these effects in the family of III-V diluted magnetic semiconductors, showing that they affect considerably the predictions of the values of the Curie temperature and should be taken into account in the search for room temperature ferromagnetism in diluted magnetic semiconductors.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 343-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical Aspects of Physical and MAC Layer Security in Visible Light Communication Systems
    Autorzy:
    Blinowski, G. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226282.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless networks
    visible light communications
    wireless network security
    industrial wireless standards
    IEEE 802.15.7
    Opis:
    Visible light communication (VLC) has been recently proposed as an alternative standard to radio-based wireless networks. Originally developed as a physical media for PANs (Personal area Networks) it evolved into universal WLAN technology with a capability to transport internet suite of network and application level protocols. Because of its physical characteristics, and in line with the slogan "what you see is what you send", VLC is considered a secure communication method. In this work we focus on security aspects of VLC communication, starting from basic physical characteristics of the communication channel. We analyze the risks of signal jamming, data snooping and data modification. We also discuss MAC-level security mechanisms as defined in the IEEE 802.15.7 standard. This paper is an extension of work originally reported in Proceedings of the 13th IFAC and IEEE Conference on Programmable Devices and Embedded Systems - PDES 2015.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 1; 7-13
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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