The Faraday rotation and spontaneous Hall effect were investigated in amorphous thin films with compositions (Gd¥e) 1
_ x M xIn this paper we report data showing that the Faraday rotation of polarized light increases with an increase in the spontaneous Hall effect in amorphous rare-earth-transition-metal alloys. It is also shown that changes in magnetization alone cannot be responsible for this relationship.As early as 1893 Kundt 1 emphasized the proportionality of Faraday rotation and Hall effect with magnetization. Judy 2 has recently reviewed a model proposed by Voigt 3 which relates Faraday rotation to Hall currents. It is this model that we use to explain our experimental results. Darwin 4 and also Gurevich and Yassievich 5 have presented theoretical discussions relating the dielectric tensor to the conductivity tensor but no data were given. Krinchik 6 examined data on Fe, Ni, and Co and concluded that magneto-optical phenomena and Hall effect are influenced by an internal effective magnetic field.It is also apparent from separate theoretical discussion of both Faraday rotation and spontaneous Hall effect in ferromagnetic metals that a relationship should exist. Argyres 7 treats the Faraday and Kerr effects on the basis of the band theory of metals using the spin-orbit interaction. This interaction provides a mechanism which links electric currents, having polarized magnetic moments, with optical properties of the material.A similar approach concerning the Hall effect in ferromagnetic metals is taken by Karplus and Luttinger 8 and also Berger. 9 The spin-orbit interaction of the polarized conduction electrons gives rise to a Hall current perpendicular to the magnetization. Berger has called this a "side jump" mechanism but Lyo and Holstein 10 have pointed out that the theories of Karplus and Luttinger and Ls of Berger are equivalent.The samples we have studied are listed in Table I; details of sample preparation are given elsewhere. 11 * 12 They are ferrimagnetic alloys of the form (Gd^Fe^^^yM (M = Bi, Sn, or Au). Hansen and Urner-Wille 11 and Urner-Wille, Hansen, and Witter 12 have found that the saturation Faraday rotation, > F , in Gd-Fe is more than 10 5 deg/cm and that
fGsum6-Les propristss magndto-optiques des films amorphes terres raresmdtaux de transition sont trOs prometteuses pour la rdalisation d'enregistrements optiques effafables. Les meilleures propristds d'enregistrement sont obtenues dans les alliages ternaires ou quaternaires, dans la gamme de compositions (Gd, Tb) (Fe, Co). Un choix adapts du rapport Gd/Tb permet droptimiser les propriltds magnstiques conduisant 1 une forte densitd d'enregistrement et 1 une stabilitg de l'information. Pour un taux 3 peu prZs 6gal de Fe et Co les propristss magndto-optiques sont maximum. Cependant, il reste des problOmes concernant la stabilits des films minces en raison de l'oxydation des alliages terres rares-mdtaux de transition. Ceci est la principale cause du vieillissement qui d6pend beaucoup de la microstructure des films.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.