Early stages of direct L1(0) FePt nanocluster formation: The effects of plasma characteristics

TitleEarly stages of direct L1(0) FePt nanocluster formation: The effects of plasma characteristics
Publication TypeJournal Article
Year of Publication2010
AuthorsPatterson MM, Cochran A, Ferina J, Rui X, Zimmerman TA, Sun Z, Kramer MJ, Sellmyer DJ, Shield JE
Journal TitleJournal of Vacuum Science & Technology B
Volume28
Pages273-276
Date Published03/01
ISBN Number1071-1023
Accession NumberISI:000276275100007
Keywordscoercive force, CONDENSATION, construction, electron microscopy, films, gas aggregation source, ion density, iron alloys, magnetic structure, magnetic-properties, metal clusters, nanostructured materials, permanent-magnets, platinum alloys
Abstract

The formation of FePt nanoclusters via gas condensation has attracted a great deal of attention. The clusters normally form with the magnetically soft A1 structure rather than the desired L1(0) structure with high magnetocrystalline anisotropy. This work has examined the effects of plasma characteristics on the early stages of order in the formation L1(0) FePt nanoclusters via inert gas condensation. The plasma characteristics have been modified to control ion density in the nanocluster condensation region. Increased ion density results in more cluster-ion collisions. The energy imparted to the clusters as a result of these collisions allows atomic rearrangements to form the ordered structure. The results indicate that controlled ion density directly impacts the early stages of FePt nanocluster ordering, according to high-resolution electron microscopy structure observations and coercivity measurements.

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