Magneto-optical spectra of Fe/Au artificial superlattices modulated by integer and noninteger atomic layers

Spectra of the magneto-optical Kerr effect, in a series of [Fe (xML)/Au (xML)]N superlattices with integer and noninteger values of x (1⩽x⩽15), were measured. For x=1 the superlattic forms an L10-type ordered alloy structure. The magneto-optical spectrum of the superlattice exhibits a prominent stru...

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Veröffentlicht in:Journal of applied physics 1999-11, Vol.86 (9), p.4985-4996
Hauptverfasser: Sato, Katsuaki, Takeda, Eishi, Akita, Masanori, Yamaguchi, Masatake, Takanashi, Koki, Mitani, Seiji, Fujimori, Hiroyasu, Suzuki, Yoshishige
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Sprache:eng
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Zusammenfassung:Spectra of the magneto-optical Kerr effect, in a series of [Fe (xML)/Au (xML)]N superlattices with integer and noninteger values of x (1⩽x⩽15), were measured. For x=1 the superlattic forms an L10-type ordered alloy structure. The magneto-optical spectrum of the superlattice exhibits a prominent structure around 4 eV, which shows a systematic shift toward higher energies as x increases (1⩽x⩽5). No such structure can be reproduced by an optical calculation assuming a simple stack of thin Fe and Au layers. Ab initio band calculations have shown similar magneto-optical spectra and a similar peak shift with an increase in x (1⩽x⩽6). This suggests that electronic structures which differ from that of a simple stack of thin Fe and Au are realized in the superlattices. For noninteger values of x, oscillatory behavior with a period of one monolayer was observed in the low energy region of the magneto-optical spectra.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.371524