Tytuł pozycji:
Magnetic Interaction by Exchange of Field Bosons
- Tytuł:
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Magnetic Interaction by Exchange of Field Bosons
- Autorzy:
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Köbler, U.
Hoser, A.
- Tematy:
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75.10.-b
75.30.Ds
- Data publikacji:
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2012-05
- Wydawca:
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Polska Akademia Nauk. Instytut Fizyki PAN
- Język:
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angielski
- Prawa:
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Wszystkie prawa zastrzeżone. Swoboda użytkownika ograniczona do ustawowego zakresu dozwolonego użytku
- Źródło:
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Acta Physica Polonica A; 2012, 121, 5-6; 1176-1178
0587-4246
1898-794X
- Dostawca treści:
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Biblioteka Nauki
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Przejdź do źródła  Link otwiera się w nowym oknie
It is shown that atomistic spin wave theory gives no correct account of the temperature dependence of the magnetic order parameter. The experimentally observed universal temperature dependence can be explained only by a field theory of magnetism. This means that instead by interacting spins (magnons) the dynamics is controlled by a boson field. The field quanta can be supposed to be magnetic density waves with dispersions that are simple power function of wave vector. This results in the observed universality. In three dimensions the field quanta have no mass and linear dispersion and cannot be observed using inelastic neutron scattering. Experiments on standing magnetic waves in thin ferromagnetic films provide direct information on the dispersion of the field quanta. A careful analysis of the available experimental data indicates that the dispersion of the field bosons is ım q, ım $q^2,$ and ım $q^{3//2}$ in three, two, and one dimensions.