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

Katsuaki Sato, Eishi Takeda, Masanori Akita, Masatake Yamaguchi, Koki Takanashi, Seiji Mitani, Hiroyasu Fujimori, Yoshishige Suzuki

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4985-4996
Number of pages12
JournalJournal of Applied Physics
Volume86
Issue number9
DOIs
Publication statusPublished - 1999 Nov 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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