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Co가 치환된 Mn 기반 호이슬러 박막 Mn<SUB>3-x</SUB>Co<SUB>x</SUB>Ga(x = 0.56)의 연 X선 방사광 분광 연구
서연지(Yeonji Seo),성승호(Seungho Seong),강정수(J.-S. Kang) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.1
The electronic structure of Mn<SUB>3-x</SUB>Co<SUB>x</SUB>Ga (x = 0.56) film, which is a candidate material for a half-metallic ferrimagnet, has been investigated by employing soft X-ray absorption spectroscopy (XAS), soft X-ray magnetic dichroism (XMCD), and photoemission spectroscopy (PES). According to Mn and Co 2p XAS measurements, Mn ions are divalent and have covalent bonding, while most of the substituted Co ions are in metallic states. The Co 2p XMCD spectrum of Mn<SUB>3-x</SUB>Co<SUB>x</SUB>Ga (x = 0.56) film is very similar to that of Co metal, supporting the finding of Co 2p XAS. Finite XMCD signals are found in both Co and Mn 2p XMCD spectra, but the intensity of the Mn 2p XMCD is much weaker than that of Co 2p XMCD. XMCD measurements reveal that the substituted Co ions in Mn<SUB>3-x</SUB>Co<SUB>x</SUB>Ga (x = 0.56) form ferromagnetic metallic clusters and induce weak polarization in Mn ions. Hence, this study suggests that ferromagnetic metallic Co clusters play an important role in determining the magnetic properties of Mn<SUB>3-x</SUB>Co<SUB>x</SUB>Ga (x = 0.56) films.