Theory of bulk and surface magnons in Heisenberg ferromagnetic superlattices

Dobrzynski, Leonard; Djafari-Rouhani, B.; Puszkarski, H.

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1103/PhysRevB.33.3251

Title :

Theory of bulk and surface magnons in Heisenberg ferromagnetic superlattices

Author(s) :

Dobrzynski, Leonard [Auteur]

Physique - IEMN [PHYSIQUE - IEMN]
Djafari-Rouhani, B. [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Puszkarski, H. [Auteur]
Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań [UAM]

Journal title :

Physical Review B

Pages :

3251-3256

Publisher :

American Physical Society

Publication date :

1986-03

ISSN :

2469-9950

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]

English abstract : [en]

We present a theoretical study of the bulk and surface magnons of a semi-infinite stack of two different ferromagnetic films. Each film is modeled by a simple-cubic lattice of spins coupled via nearest-neighbor exchange ...
Show more >We present a theoretical study of the bulk and surface magnons of a semi-infinite stack of two different ferromagnetic films. Each film is modeled by a simple-cubic lattice of spins coupled via nearest-neighbor exchange (Heisenberg ferromagnet). The superlattice has a larger periodicity in the direction perpendicular to the slabs and therefore many magnon branches in the folded Brillouin zone. In the gaps exisiting between these magnon branches appear the surface-localized magnons. The simplicity of our model allows one to obtain in closed form the bulk and (001) surface Green's functions for this magnetic superlattice. The analytic knowledge of these functions enables us to study easily all the bulk and and surface magnetic properties of a ferromagnetic superlattice. We give here the analytic expression we obtained for the folded bulk magnons and also the expression that gives the surface-localized modes, which may appear within the extra gaps which exist between the folded bulk bands. One figure for a specific case illustrates these results.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL

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