Spin Polarization of Sub-monolayer Cu Embedded in Fe_<70>Co_<30> Films

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概要

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• Spin polarization of Cu embedded in Fe_<70>Co_<30> films has been investigated by means of transmission x-ray magnetic circular dichroism (XMCD). [Fe_<70>Co_<30>(d_<FeCo>)/Cu(d_<Cu>)]_n multilayered films were fabricated on Si-N membrane substrate, fixing total thickness of Fe-Co and Cu layers. Magneto-optical sum-rules were applied to the measured absorption and XMCD spectra to determine quantitatively the spin and orbital moments of Cu. With decreasing the Cu layer thickness, the spin moment of Cu increases but exhibits to be saturated about 0.1μ_B/atom. The small value of spin moment (0.1μ_B), comparing to that of the 3d transition metals such as Fe and Co, implies that only the top part of 3d down-spin band of Cu is unoccupied in these specimens.

• 2008-11-01

著者

• Takahashi M.

  New Industry Creation Hatchery Center, Tohoku University

• Tsunoda M.

  Department Of Electronic Engineering Tohoku University

• Isogami S.

  Department of Electronic Engineering, Tohoku University

• Nakamura T.

  Japan Synchrotron Radiation Research Institute SPring-8

• Isogami S.

  Department Of Electronic Engineering Tohoku University

関連論文

• Spin Polarization of Sub-monolayer Cu Embedded in Fe_Co_ Films
• Compositional Dependence of Exchange Anisotropy in γ-Mn-Ir-Rh-Ru/Co_Fe_ Bilayers

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