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 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
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. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.371524 |