Early stages of direct L10 FePt nanocluster formation: The effects of plasma characteristics

Patterson, M. M.; Cochran, A.; Ferina, J.; Rui, X.; Zimmerman, T. A.; Sun, Z.; Kramer, M. J.; Sellmyer, D. J.; Shield, J. E.

doi:doi:10.1116/1.3298888

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Journal of Vacuum Science & Technology B / Volume 28 / Issue 2 / Regular Articles

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J. Vac. Sci. Technol. B 28, 273 (2010); http://dx.doi.org/10.1116/1.3298888 (4 pages)

Early stages of direct L1₀ FePt nanocluster formation: The effects of plasma characteristics

M. M. Patterson¹, A. Cochran¹, J. Ferina², X. Rui³, T. A. Zimmerman⁴, Z. Sun⁵, M. J. Kramer⁶, D. J. Sellmyer⁷, and J. E. Shield³

¹Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 and Department of Physics, Stout Polytechnic, Menomonie, Wisconsin 54751
²Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 and Department of Physics, Madison Area Technical College, Madison, Wisconsin 53704
³Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 and Department of Mechanical Engineering, University of Nebraska, Lincoln, Nebraska 68588
⁴Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 and Department of Physics, Gustavus Adolphus, St. Peter, Minnesota 56082
⁵Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588
⁶Ames Laboratory, USDOE, Ames, Iowa 50011
⁷Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588 and Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588

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(Published online 19 March 2010)

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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 L1₀ structure with high magnetocrystalline anisotropy. This work has examined the effects of plasma characteristics on the early stages of order in the formation L1₀ 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.

ACKNOWLEDGMENTS

The authors thank Pam Rasmussen for her scientific contributions, and David Booth and Ryan Kraft for HRTEM Fourier Transform image analysis. They also acknowledge the NSF Materials Research Science and Engineering program under Grant Nos. DMR-0213808 and DMR-0820521, and the faculty-student pair summer program. Work at the Ames Laboratory was supported by the Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-AC02-07CH11358.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS
SUPPLEMENTAL INFORMATION: DETAILS OF COLLISION FREQUENCY CALCULATION
SUMMARY

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KEYWORDS and PACS

Keywords

coercive force, condensation, electron microscopy, ion density, iron alloys, magnetic structure, metal clusters, nanostructured materials, platinum alloys, iron platinum (FePt), argon gas (Ar), liquid nitrogen

PACS

81.07.Bc

Nanocrystalline materials
61.46.Bc

Structure of clusters (e.g., metcars; not fragments of crystals; free or loosely aggregated or loosely attached to a substrate)
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects
73.22.-f

Electronic structure of nanoscale materials and related systems

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History

Received 6 August 2009
Accepted 4 January 2010
Published online 19 March 2010

Digital Object Identifier

http://dx.doi.org/10.1116/1.3298888

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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