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Articolul urmator |
169 0 |
SM ISO690:2012 COJOCARU, Sergiu, CEULEMANS, Arnout. Magnon excitations in a mesoscopic Heisenberg ferromagnet. In: Physical Review B - Condensed Matter and Materials Physics, 2002, vol. 66, pp. 1-9. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.66.224416 |
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Physical Review B - Condensed Matter and Materials Physics | ||||||
Volumul 66 / 2002 / ISSN 1098-0121 /ISSNe 1550-235X | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.66.224416 | ||||||
Pag. 1-9 | ||||||
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Rezumat | ||||||
We report on a qualitative change of the character of interacting magnon excitations in a ferromagnet due to finite size. Within an improved continuum approach excitation modes are found analytically for a two-dimensional system. Several non-totally symmetric modes are obtained which were previously unknown. In contrast to excitations in one dimension some of the low energy modes approach the macroscopic limit extremely slowly. These modes occupy a substantial part of the Brillouin zone and can therefore be responsible for the logarithmic size dependence of various thermodynamic quantities. |
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Cuvinte-cheie article, calculation, elementary particle, energy, excitation, mathematical analysis, mathematical model, measurement, molecular interaction, thermodynamics |
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