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Coexistence of various Nd-rich and Fe-rich Fe-Nd short range orderings in bulk glassy Nd60Fe30Al10 hard magnets
KTH, Superseded Departments, Materials Science and Engineering.
2001 (English)In: Materials transactions, ISSN 1345-9678, E-ISSN 1347-5320, Vol. 42, no 8, 1547-1551 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2001. Vol. 42, no 8, 1547-1551 p.
Keyword [en]
hard magnetic properties, bulk metallic glasses, magnetic short range, order, ferromagnetic phases, amorphous-alloys, system
Identifiers
URN: urn:nbn:se:kth:diva-20951ISI: 000171112800018OAI: oai:DiVA.org:kth-20951DiVA: diva2:339648
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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