Correlation between magnetic properties and the electronic structures of soft magnetic ternary Fe_78−xY_xB₂₂(x= 4–9) bulk metallic glasses

Abstract

Fe and Y K-edge extended x-ray absorption fine structure, Fe(Y) L(3,2)-edge (L(3)-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 Fe(78-x)Y(x)B(22) bulk metallic glasses (BMGs). The combined XANES and VB-PES results do not show broadening of the Fe 3d band to support the 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.

Effects of rare-earth size on the electronic structure of La1−xLuxVO3

“…Here, every effort has been made to minimize extrinsic effects, and the absence of surface contaminant species in both V L-and O K-edges at both temperatures, and the similarity between surface-(TEY) and bulk-sensitive (TFY) probes, support an intrinsic origin for this evolution. Similar enhancements to the branching ratio have previously been observed at transition-metal L−edges in magnetic systems using both XAS and electron energyloss spectroscopy [36][37][38], and have been associated with the evolution in the magnitude of the local magnetic moment [35]. Tentatively, we suggest the increase in the branching ratio observed here for LaVO 3 reflects the increase in the mean magnitude of the local moment that develops in the lowtemperature AFM phase.…”

Influence of metalloids and annealing on the fundamental magnetic properties of bulk Fe–(Cr,Mo,Ga)–(P,B,C) metallic glasses

“…In addition, the reduced thickness of the foils causes a decrease in the core packing density since air gaps are left between the large number thin foils needed to build up the core, and this decreases the efficiency of the transformer. Therefore, there has been an increasing interest in achieving bulk ferromagnetic glasses, which have been synthesized in such systems as Fee(Al,Ga)e(P,C,B,Si) [4], CoeCre(Al,Ga)e(P,B,C) [5], Fee(Co,Ni)e(Zr,Nb,Ta)eB [6], CoeFee(Zr,Nb,Ta)eB [7], Fe-(Co,Cr,Mo,Ga,Sb)ePeBeC [8], FeeNiePeB [9], FeeCreMoeGaePeBeC [10], FeeMoe(P,C) [11], FeeMoeGae(P,B,C) [11], Fe-(Co, Ni, Hf, Mo, Nb, Y)eB [12e14], FeeNbeB [15], FeeYeB [16], FeePeC [17], FeeSieBeP [18], FeeNbeSiePeBeC [19], and FeeCoePeC [20]. In these studies, the glass forming ability and magnetic properties are often optimized by changing the content of alloying metallic elements.…”

Glass-forming ability and magnetic properties of CoFeMoYB bulk glassy alloys with large supercooled liquid region

“…In 2005, a new ternary Fe 72 Y 6 B 22 BGA in diameter up to 2 mm with excellent soft-magnetic properties was synthesized [6]. From then on, many Fe-based BGAs with high GFA were reported by adjusting the initial composition of Fe 72 Y 6 B 22 [18][19][20][21]. In this study, with the aim of increasing the GFA of the Co-based glassy alloys, Mo was added and Fe was partial substituted for Co, and optimized the alloy compositions by modifying the Y content.…”