Magneto-optical spectroscopy as a structure- and chemical-order sensitive probe

D. K. Weller; Gerald R. Harp; Robin F. C. Farrow; A. Carl; J. Sticht

doi:10.1117/12.175779

11 May 1994 Magneto-optical spectroscopy as a structure- and chemical-order sensitive probe

D. K. Weller, Gerald R. Harp, Robin F. C. Farrow, A. Carl, J. Sticht

Proceedings Volume 2140, Epitaxial Growth Processes; (1994) https://doi.org/10.1117/12.175779
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We use the ex-situ technique of magneto-optical spectroscopy to characterize MBE-grown Co, Co-Pt, and evaporated Co-Ni films and show that subtle changes in the structural and chemical order as well as changes in the crystallographic properties can substantially affect the magneto-optical spectra. These can be viewed as a sensitive probe of the spin-polarized electronic structure of a magnetic material, which in turn is strongly structure dependent. In particular, we discuss the effect of the crystallographic phase on the spectra of 1000 angstrom thick fcc and hcp Co and fcc and hcp Co₈₂Ni₁₈ films in the photon energy range 08 - 5.5 eV. In Co_1-xPt_x alloys, of compositions x approximately equals 0.75 and approximately equals 0.5, large changes in the magneto-optical spectra are observed if chemical ordering is induced either by annealing below the disorder-order transition temperature or by direct growth near the ordering temperature. Other examples are the discovery of a new chemically ordered, hexagonal Co-Pt phase at the composition x approximately equals 0.25 and an unprecedented large Kerr effect in the chemically ordered Fe₁Pt₁ (L1₀) phase.

Citation Download Citation

D. K. Weller, Gerald R. Harp, Robin F. C. Farrow, A. Carl, and J. Sticht "Magneto-optical spectroscopy as a structure- and chemical-order sensitive probe", Proc. SPIE 2140, Epitaxial Growth Processes, (11 May 1994); https://doi.org/10.1117/12.175779

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