X-ray diffraction measurements of lattice strains in Co/Pd(001) superlattices films

Lianjun Wu, Noriaki Nakayama, Brad N. Engel, Teruya Shinjo, Charles M Falco

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Abstract

Lattice spacings in fcc-Co/Pd(001) superlattice films grown on GaAs(001) substrates with a Ag(001) buffer layer were measured using a four-circle diffractometer. For samples with Co layers thinner than 9 angstrom and Pd layers thinner than 12 angstrom, the observed in-plane (110) lattice spacings were all 2.71±0.01 angstrom, indicating 8.0% lattice expansion of Co layers and 1.5% lattice contraction of Pd layers. The (002) lattice spacings along the growth direction were estimated from a profile fitting method, and they were 1.60±0.02 angstrom for Co layers and 1.98±0.02 angstrom for Pd layers. This means that Co layers are contracted nearly 10%, while Pd layers are expanded 2% along the growth direction of the superlattice films. The estimated large lattice strains are successfully applied to explain the large magnetovolume contribution to the magnetic anisotropy reported previously.

Original languageEnglish (US)
Pages (from-to)4726-4731
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume32
Issue number10
Publication statusPublished - Oct 1993

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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