Correlation between magnetic properties and the electronic structures of soft magnetic ternary Fe78-xYxB22 (x= 4-9) bulk metallic glasses

• Main Authors: Ming-Tsung Liu, 劉明聰
• Other Authors: Way-Faung Pong
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/44746224478894499476

碩士 === 淡江大學 === 物理學系碩士班 === 98 === Fe and Y K-edge extended x-ray absorption fine structure (EXAFS), Fe (Y) L3,2-edge (L3-edge) x-ray absorption near-edge structure (XANES) and valence-band photoemission spectroscopy (VB-PES) measurements have been carried out to study soft magnetic ternary Fe78-xYxB22 bulk metallic glasses (BMGs). The combined XANES and VB-PES results do not show broadening of the Fe 3d band to support previous interpretation of the reduction of the magnetic moment in BMGs by Y-induced decrease of exchange splitting of Fe 3d orbitals. Instead, the density of delocalized/itinerant Fe 3d states in the vicinity of the Fermi level is found to be reduced by Y substitution, which reduces the strength of itinerant-states mediated ferromagnetic coupling between local spins on the Fe ions and the total magnetic moment of the Fe-based BMGs.