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The Role of Next‐Nearest Neighbours for the Existence Conditions of Subsurface Spin Waves in Magnetic Films
Author(s) -
Mamica S.,
Puszkarski H.,
Lévy J.C.S.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200004)218:2<561::aid-pssb561>3.0.co;2-q
Subject(s) - brillouin zone , condensed matter physics , spin wave , spin (aerodynamics) , surface (topology) , exchange interaction , physics , nearest neighbour , ferromagnetism , geometry , mathematics , thermodynamics , artificial intelligence , computer science
Spin‐wave energies and respective band structures throughout the two‐dimensional Brillouin zone are investigated in magnetic (cubic) thin films for the surface orientations sc(110), bcc(110) and fcc(110). We apply the Heisenberg localized spin model assuming exchange nearest (NN) and next‐nearest (NNN) neighbour interactions and elucidate the role of the geometrical disposition of the NN and NNN neighbourhoods for the emergence of surface (SSW) and subsurface spin waves (SSSW). The necessary condition for the emergence of SSSW is found to require the NNN bonds to be cut at the surface obliquely thereto.