HAL Id: jpa-00224168
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Submitted on 1 Jan 1984
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POWER SPECTRA OF LOCALIZED RETARDED MODES IN A FERROMAGNETIC SLAB
N. Lima, F. Oliveira
To cite this version:
N. Lima, F. Oliveira. POWER SPECTRA OF LOCALIZED RETARDED MODES IN A FERROMAGNETIC SLAB. Journal de Physique Colloques, 1984, 45 (C5), pp.C5-337-C5-337.
�10.1051/jphyscol:1984550�. �jpa-00224168�
JOURNAL DE PHYSIQUE
Colloque C5, suppl6ment au n04, Tome 45, avril 1984 page C5-337
N.P. Lima and F . A . O l i v e i r a
D e p a r t a m e n t o d e F i s i c a , UFF, N i t e r o ' i , 24210 - R J , B r a z i Z
R6sume - Dans ce t r a v a i l , nous u t i l i s o n s l e s r e s u l t a t s de c e r t a i n s travaux a n t e r i e u r s s u r des c a l c u l s de f o n c t i o n de Green / I / , a f i n d ' o b t e n i r l a den- s i t e d ' e n e r g i e ( s p e c t r e de puissance) des modes l o c a l i s e s d'une lame mince ferromagnetique. Ces r e s u l t a t s donnent l e s p e c t r e de puissance P en f o n c t i o n de l a frequence w , du vecteur d'onde Q du champ e x t e r n e applique e t de l a coordonn6e x normale Fi l a s u r f a c e du f i l m . P(w, Q) peut Otre directement r e - l i e aux r 6 s u l t a t s experimentaux, t a n d i s que P(w,x) peut e t r e u t i l i s e pour montrer que l a propagation de c e s modes e s t non reciproque, a i n s i que pour e t a b l i r l e u r s p r o p r i e t e s de sym6trie / 2 / .
Abstract - In t h e present work we use some previous r e s u l t s on Green func- t i o n c a l c u l a t i o n s /1/ i n o r d e r t o o b t a i n t h e d e n s i t y of energy (power spec- t r a ) of t h e l o c a l i z e d modes within a ferromagnetic s l a b . Those r e s u l t s show t h e power s p e c t r a P as a function of frequency w , t h e wavevector Q of t h e external d r i v i n g f i e l d , and of t h e coordinate x ; where x i s normal t o t h e s l a b s u r f a c e . P(w,g) may be d i r e c t l y r e l a t e d t o experiments, while P(w,x) may be used t o show t h e nonreciprocal propagation of those modes and t h e i r symmetry p r o p e r t i e s /2/.
REFERENCES
/1/ N . P . LIMA and F.A. OLIVEIRA, t o be published.
F.A. OLIVEIRA, Physics L e t t e r s A (1983), t o be published.
/2/ F.A. OLIVEIRA, Solid S t a t e Commun. 40, 859-61 (1981). -.
'supported by UFF, CNPq and FINEP ( B r a z i l i a n ~ o v e r n m e n t ) .
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1984550