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• W2023146246 abstract "The electronic and magnetic structures of a Mn ultrathin film grown on a 3-ML (monolayer) Co film have been investigated during stepwise oxidation by means of O K-, Mn ${L}_{mathrm{I}mathrm{I}mathrm{I},mathrm{I}mathrm{I}}ensuremath{-},$ and Co ${L}_{mathrm{I}mathrm{I}mathrm{I},mathrm{I}mathrm{I}}ensuremath{-}mathrm{e}mathrm{d}mathrm{g}mathrm{e}$ x-ray-absorption spectroscopy and Mn ${L}_{mathrm{I}mathrm{I}mathrm{I},mathrm{I}mathrm{I}}ensuremath{-},$ and Co ${L}_{mathrm{I}mathrm{I}mathrm{I},mathrm{I}mathrm{I}}ensuremath{-}mathrm{e}mathrm{d}mathrm{g}mathrm{e}$ x-ray magnetic circular dichroism (XMCD). Without ${mathrm{O}}_{2},$ strong interaction between the Mn and Co $3d$ orbitals was suggested and Mn-Co ferromagnetic coupling was confirmed. We observed significant suppression of the d hole number and the spin and orbital moments of Co after Mn deposition compared to those before Mn deposition. These findings imply that the Mn d electrons are transferred to the minority-spin levels of Co. At 0.5-L (Langmuir) ${mathrm{O}}_{2}$ exposure, the spin and orbital moments of Co do not change noticeably, while the Mn ${L}_{mathrm{I}mathrm{I}mathrm{I},mathrm{I}mathrm{I}}ensuremath{-}mathrm{e}mathrm{d}mathrm{g}mathrm{e}$ XMCD almost completely vanishes. After 5.5-L ${mathrm{O}}_{2}$ exposure, an antiparallel spin alignment between Mn and Co was observed. The estimated orbital moments of Mn is reduced from 0.06 (before oxidation) to $<0.005{ensuremath{mu}}_{B}$ (after oxidation). It is concluded that unoxidized Mn is in the ${d}^{5}{+d}^{6}$ state while oxidized Mn is in the ${d}^{5}$ high-spin state. Such variance of the electron configuration of Mn can explain the unusual magnetic properties. Antiferromagnetic coupling between Co and oxidized Mn may originate from the ${d}^{5}$ high-spin configuration of Mn rather than from the superexchange interaction between Mn and Co via the O atom." @default.
• W2023146246 created "2016-06-24" @default.
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• W2023146246 date "2001-05-02" @default.
• W2023146246 modified "2023-10-11" @default.
• W2023146246 title "Magnetism of an ultrathin Mn film on Co(100) and the effect of oxidation studied by x-ray magnetic circular dichroism" @default.
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• W2023146246 doi "https://doi.org/10.1103/physrevb.63.214406" @default.
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