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Electronic Structures and Magnetic Properties of Fe/Si/Fe Trilayer |
Journal of Magnetics, Volume 1, Number 1, 30 Jun 1996, Pages 4-8 |
Jin-Ho Park(Department of Physics, Pohang University of Science and Technology), Suk-Ju Youn(Department of Physics, Pohang University of Science and Technology), Byung-Il Min(Department of Physics, Pohang University of Science and Technology), Jae-Yel Yi,(Korea Research Institute of Standards and Science) |
Abstract |
Employing the LMTO band method, we have studied electronic and magnetic properties of Fe/Si/Fe trilayer in which the z-direction is chosen to be (111) direction of FeSi with B2 phase, We have also determined electronic structure of bulk FeSi, as a reference material. The ground state of FeSi is paramagnetic insulator with a band gap of 0.05 eV. Band structures of Fe/Sin/Fe with varying the thickness of the spacer layer reveal that the spacer layer is metallic, and the states along the growth direction do not disperse much reflecting a two-dimensional nature. Magnetic moment of Fe atom in the interfacial layer of Fe/Sin/Fe is reduced a lot as compared to the bulk value, suggesting a strong hybridization between Fe and Si states. The geometry of the Fermi surface indicates that the magnetic coupling period of ~8ML (monolayers) in Fe/Sin/Fe is explained with a short Fermi wave vector of bcc Si. |
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