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- Ortega, F, Ehrenberg, M, Acerenza, L, Westerhoff, H.V, and Cascante, M
(författare)
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Sensitivity analysis of metabolic cascades catalyzed by bifunctional enzymes
- 2002
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Ingår i: journal. - : Mol. Biol. Rep.. ; 29, s. 211-215
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Tidskriftsartikel (refereegranskat)
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- Ortega-Hertogs, R. J., et al.
(författare)
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Coexistence of various Nd-rich and Fe-rich Fe-Nd short range orderings in bulk glassy Nd60Fe30Al10 hard magnets
- 2001
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Ingår i: Materials transactions. - : Japan Institute of Metals. - 1345-9678 .- 1347-5320. ; 42:8, s. 1547-1551
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Tidskriftsartikel (refereegranskat)abstract
- Bulk Nd60Fe30Al10 metallic glasses are found to exhibit a complex magnetic behavior at very low temperatures related to the coexistence of various Nd-rich and Fe-rich magnetic short range orderings, as evidenced by AC-susceptibility studies in combination with hysteretic loops at fields up to 30 T. Above 80 K the magnetic behavior is shown to correlate with Stoner-Wohlfarth hysteresis loops with pronounced thermal activation effects. These observations suggest the existence of an Fe-rich Fe-Nd hard magnetic 'phase' formed by an ensemble of randomly oriented uniaxial magnetic nanoentities embedded in a Nd-rich matrix. The exchange coupling and development of a large axial crystal field anisotropy at very low temperatures and the uncoupling above 70 K of the Fe-rich Fe-Nd hard magnetic phase to the Nd-rich matrix appears to be at the origin of the observed overall magnetic behavior.
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