Structural and magnetic studies of Fe/W metallic superlattices (abstract)

A. Boufelfel, Roy M. Emrick, Charles M Falco

Research output: Contribution to journalArticlepeer-review

Abstract

We have sputter deposited Fe/W superlattices on several types of substrates using magnetically enhanced dc sputtering guns. The deposition rates were controlled to better than 0.3%. We used a 6‐MV Rutherford backscattering facility to determine the chemical composition with 0.5% relative uncertainty. We varied the modulation wavelength from Λ=4.4 to 250 Å, keeping the number of atomic layers equal for both materials. Structural characterization was achieved by several x‐ray diffraction techniques. We found that the superlattice structural coherency breaks down below Λc=21.5 Å, although the multilayered structural periodicity still holds below this value. We used conversion electron Mössbauer spectroscopy to measure the intrinsic hyperfine magnetic field of the samples at room temperature. The data was fitted with two independent methods which show very good agreement. We observed a decrease in the hyperfine field value as the modulation wavelength Λ decreases, and a disappearance for Λc. This effect is interpreted as due to structural strains of the whole superlattice and electronic structure changes at the interfaces.

Original languageEnglish (US)
Pages (from-to)3221
Number of pages1
JournalJournal of Applied Physics
Volume63
Issue number8
DOIs
StatePublished - Apr 15 1988

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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