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Titolo:
Photoinduced optical second-harmonic generation in Fe-Co-Si-B metallic spin glasses
Autore:
Kityk, IV; Jakubczyk, E; Sahraoui, B; Phu, XN;
Indirizzi:
Czestochowa WSP, Inst Phys, PL-42201 Czestochowa, Poland Czestochowa WSP Czestochowa Poland PL-42201 PL-42201 Czestochowa, Poland Univ Angers, Lab POMA, Angers, France Univ Angers Angers FranceUniv Angers, Lab POMA, Angers, France
Titolo Testata:
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
fascicolo: 1, volume: 3, anno: 2001,
pagine: 39 - 44
SICI:
1464-4258(200101)3:1<39:POSGIF>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED 2ND-HARMONIC GENERATION; SPECTROSCOPY; ABSORPTION; INTERFACE; SURFACES; FILMS;
Keywords:
photoinduced phenomena; optical second harmonic generation; spin glasses;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Kityk, IV Czestochowa WSP, Inst Phys, Al Armii Krajowej 13-15, PL-42201 Czestochowa,Poland Czestochowa WSP Al Armii Krajowej 13-15 Czestochowa Poland PL-42201
Citazione:
I.V. Kityk et al., "Photoinduced optical second-harmonic generation in Fe-Co-Si-B metallic spin glasses", J OPT A-P A, 3(1), 2001, pp. 39-44

Abstract

For the first time the second-order nonlinear optical effect has been observed in metallic spin glasses. Photoinduced second-harmonic generation (PISHG) in reflected light was used as a particular nonlinear optical method. We have varied the degree of long-range spin ordering detected by magnetoresistance measurements. PISHG is measured immediately after thermotreatment using thermoannealing (up to 823 K) of Fe18Co60Si9B13 glass. As a photoinducing beam a Q-switched nitrogen laser (lambda = 337 nm) was used. A YAG:Nd pulse laser (W = 30 MW, tau = 30 ps, and frequency repetition of about 12 Hz) was applied as a probe. Only the presence of the photoexcitation stimulates the appearance of the PISHG with a value up to 0.128 pm V-1. The influence of the surface, phase matching conditions, fluorescence etc, is discussed. We have revealed an almost linear correlation between the degree of spinordering and the PISHG output signal for different gaseous media. Molecular dynamics geometry optimization and self-consistent quantum chemical simulations have been performed. The observed phenomenon can be explained by contributions of long-range-ordered spins to electronic dipole moments determining second-order nonlinear optical susceptibilities.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/06/20 alle ore 09:42:55