Chernet Amente Geffe (9 results)

Condition: New. pp. 144.

Taschenbuch. Condition: Neu. Study Of Photoinduced Ferromagnetism | In Diluted Magnetic Semiconductor (Ga,Mn)As | Chernet Amente Geffe (u. a.) | Taschenbuch | 144 S. | Englisch | 2013 | LAP LAMBERT Academic Publishing | EAN 9783847335832 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. …

Paperback. Condition: Like New. LIKE NEW. SHIPS FROM MULTIPLE LOCATIONS. book.

Taschenbuch. Condition: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Effects of photo-excitation and spin wave scattering on magnetism of the diluted magnetic semiconductor (DMS) (Ga,Mn)As is theoretically studied. The exchange coupling energy between Mn+2 spins local moments is computed starting with the zeeman energy. Its equivalence with the Rudermann-Kittel-Kasuya-Yosida (RKKY) exchange energy which is known to have an oscillatory characteristics and contributing to an indirect exchange, expressed based on the Zener model is described. This energy is shown to rise to maximum near/at resonance. Green function formalism is used to find expression for ferromagnetic transition temperature TC, magnetization and magnetic specific heat Cmag starting with a model Hamiltonian consisting of magnons, photons and an interaction of magnons with photons. TC is indicated for zero impurity concentration, x = 0. Unusual upturn in magnetization and negative magnon specific heat are observed at very low temperature values for larger magnon-photon coupling constant, in which an increase in this coupling is found to decrease Cmag, and enhance the magnetization and the ferromagnetic ordering. 144 pp. Englisch.…

Taschenbuch. Condition: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Effects of photo-excitation and spin wave scattering on magnetism of the diluted magnetic semiconductor (DMS) (Ga,Mn)As is theoretically studied. The exchange coupling energy between Mn+2 spins local moments is computed starting with the zeeman energy. Its equivalence with the Rudermann-Kittel-Kasuya-Yosida (RKKY) exchange energy which is known to have an oscillatory characteristics and contributing to an indirect exchange, expressed based on the Zener model is described. This energy is shown to rise to maximum near/at resonance. Green function formalism is used to find expression for ferromagnetic transition temperature TC, magnetization and magnetic specific heat Cmag starting with a model Hamiltonian consisting of magnons, photons and an interaction of magnons with photons. TC is indicated for zero impurity concentration, x = 0. Unusual upturn in magnetization and negative magnon specific heat are observed at very low temperature values for larger magnon-photon coupling constant, in which an increase in this coupling is found to decrease Cmag, and enhance the magnetization and the ferromagnetic ordering.…

Condition: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Geffe Chernet AmenteStudied Physics and got BSc in 1988, MSc in 2005, and PhD in 2010 from Science Faculty, Addis Ababa University. My research interest is on diluted magnetic semiconductors, spintronics. Currently I am working at Ad.…

Condition: New. Print on Demand pp. 144 2:B&W 6 x 9 in or 229 x 152 mm Perfect Bound on Creme w/Gloss Lam.

Condition: New. PRINT ON DEMAND pp. 144.

Taschenbuch. Condition: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Effects of photo-excitation and spin wave scattering on magnetism of the diluted magnetic semiconductor (DMS) (Ga,Mn)As is theoretically studied. The exchange coupling energy between Mn+2 spins local moments is computed starting with the zeeman energy. Its equivalence with the Rudermann-Kittel-Kasuya-Yosida (RKKY) exchange energy which is known to have an oscillatory characteristics and contributing to an indirect exchange, expressed based on the Zener model is described. This energy is shown to rise to maximum near/at resonance. Green function formalism is used to find expression for ferromagnetic transition temperature TC, magnetization and magnetic specific heat Cmag starting with a model Hamiltonian consisting of magnons, photons and an interaction of magnons with photons. TC is indicated for zero impurity concentration, x = 0. Unusual upturn in magnetization and negative magnon specific heat are observed at very low temperature values for larger magnon-photon coupling constant, in which an increase in this coupling is found to decrease Cmag, and enhance the magnetization and the ferromagnetic ordering.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 144 pp. Englisch.…