| Autor: |
Mastrogiacomo, Giovanni, Kradolfer, Jürg, Löffler, Jörg F. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 1/1/2007, Vol. 101 Issue 1, p013909-N.PAG, 6p, 1 Chart, 8 Graphs |
| Abstrakt: |
The glass-forming ability of Fe-based bulk metallic glasses is strongly correlated with the amount of metalloids they contain. Starting from a ferromagnetic and ductile Fe-based metallic glass of composition (Fe0.582Co0.418)80Cr10Zr10, we were able to produce several bulk metallic glasses by alloying titanium and boron. The resulting alloys of composition [(Fe0.582Co0.418)0.81Cr0.10Zr0.07Ti0.02]100-xBx (x=10–20 at. %) exhibit a critical casting thickness of 0.5 mm, a wide undercooled liquid region ΔTx(=Tx-Tg) of 16–84 K, and ferromagnetic properties. dc magnetization measurements show an inverted hysteresis at room temperature, and small-angle neutron scattering on the [(Fe0.582Co0.418)0.81Cr0.10Zr0.07Ti0.02]90B10 bulk metallic glass reveals a power-law dependence of the differential scattering cross-section. The latter indicates a pronounced short-range order with a surface fractal dimension of 2.5. A splat-cooled sample of the same composition does not reveal this pronounced short-range order, but still an inverted hysteresis. From the scaling behavior of the magnetization curves, measured at different temperatures between 50 and 300 K for the splat-cooled sample, we find that an antagonistic internal magnetic field is present in this material. The resulting inverted hysteresis is presumably caused by interacting superparamagnetic and blocked regions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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