Soft X-ray Magnetic Circular Dichroism of c(2x2) CuMn Ordered Surface Alloy
A. Kimura, T. Kanbe, T. Xie, M. Taniguchi, S. Qiao, T. Muro, S. Imada, and S. Suga
TL;DR
This study uses soft X-ray magnetic circular dichroism to demonstrate ferromagnetism in a c(2x2) CuMn surface alloy at low temperature, revealing localized Mn 3d states with high spin moments.
Contribution
It presents the first application of XMCD to a c(2x2) CuMn surface alloy, showing ferromagnetic order and detailed electronic structure insights.
Findings
Clear XMCD signal observed at 25K
Mn 3d states are localized with high spin magnetic moments
Ferromagnetic order confirmed under 1.4 Tesla magnetic field
Abstract
Mn 2p soft X-ray absorption (XAS) spectroscopy excited with circularly polarized synchrotron radiation has been applied to a new class of material, c(2x2)CuMn/Cu(001) two-dimensional ordered surface alloy. A significant X-ray magnetic circular dichroism (XMCD) signal has been clearly observed at T=25K, indicating the existence of the ferromagnetic state under the external magnetic field of 1.4 Tesla. The lineshape analyses of the XAS and XMCD spectra clearly show that the Mn 3d state is rather localized and has a high spin magnetic moment due to its half-filled character.
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