Electronic and magnetic interfacial states of Ag in an Ni81Fe19/Ag coupled multilayer
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Studies of the Ag induced magnetic moments at the interfaces in an [Ni81Fe19(29 Å)/Ag(11 Å)]135 multilayer by x-ray magnetic circular dichroism (XMCD) and x-ray resonant magnetic scattering (XRMS) at the Ag L2,3 edges are reported. This allows us to quantify the interfacial magnetic moments as well as the extension through the silver layer. From the experimental XMCD spectra and thanks to the use of full relativistic band structure calculations, we succeed in extracting quantitative spin and orbital magnetic moments held by the 4d states of silver. Moreover, we show that, although silver has an almost full 4d band, magneto-optical sum rules can be safely applied in the case of the noble metal L edges. We find from XMCD that Ag is polarized by Ni81Fe19 and has a total magnetic moment of 0.0136 μB spatially averaged over the 11 Å layer thickness. XRMS analysis indicates that this induced polarization is enhanced at the interface but remains present inside the whole Ag layer, demonstrating the existence of an indirect coupling between the NiFe layers through the non-magnetic spacer.Keywords:
Inductive coupling
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The elemental magnetic moments of Co and Cr in CoCrPt films were investigated using xray magnetic circular dichroism (XMCD). The spin and orbital moments of Co was calculated using the sum rules; it was found that the magnetic moment of Co in CoCrPt films was dominated by spin moment contribution. The total magnetic moment of Co was found to be lower than that of bulk Co. Further, the Cr moment was aligned anti-ferromagnetically with respect to Co, resulting in a decrease of saturation magnetization (Ms) in CoCrPt films.
Saturation (graph theory)
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Ferrimagnetism
X-ray absorption spectroscopy
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Magnetism
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Dysprosium
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Interface perpendicular magnetic anisotropy (PMA) in ultrathin Fe/MgO (001) has been investigated using angular-dependent x-ray magnetic circular dichroism (XMCD). We found that anisotropic orbital magnetic moments deduced from the analysis of XMCD contribute to the large PMA energies, whose values depend on the annealing temperature. The large PMA energies determined from magnetization measurements are related to those estimated from the XMCD and the anisotropic orbital magnetic moments through the spin-orbit interaction. The enhancement of anisotropic orbital magnetic moments can be explained mainly by the hybridization between the Fe 3dz2 and O 2pz states.
Spin–orbit interaction
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