The formation of FePt nanoclusters via gas condensation has attracted a great deal of attention. The clusters normally form with the magnetically soft structure rather than the desired structure with high magnetocrystalline anisotropy. This work has examined the effects of plasma characteristics on the early stages of order in the formation 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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March 2010
Research Article|
March 19 2010
Early stages of direct FePt nanocluster formation: The effects of plasma characteristics
M. M. Patterson;
M. M. Patterson
a)
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588 and Department of Physics, Stout Polytechnic
, Menomonie, Wisconsin 54751
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A. Cochran;
A. Cochran
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588 and Department of Physics, Stout Polytechnic
, Menomonie, Wisconsin 54751
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J. Ferina;
J. Ferina
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588 and Department of Physics, Madison Area Technical College
, Madison, Wisconsin 53704
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X. Rui;
X. Rui
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588 and Department of Mechanical Engineering, University of Nebraska
, Lincoln, Nebraska 68588
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T. A. Zimmerman;
T. A. Zimmerman
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588 and Department of Physics, Gustavus Adolphus
, St. Peter, Minnesota 56082
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Z. Sun;
Z. Sun
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588
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M. J. Kramer;
M. J. Kramer
Ames Laboratory,
USDOE
, Ames, Iowa 50011
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D. J. Sellmyer;
D. J. Sellmyer
Nebraska 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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J. E. Shield
J. E. Shield
Nebraska Center for Materials and Nanoscience,
University of Nebraska
, Lincoln, Nebraska 68588 and Department of Mechanical Engineering, University of Nebraska
, Lincoln, Nebraska 68588
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a)
Electronic mail: marlann.patterson@gmail.com
J. Vac. Sci. Technol. B 28, 273–276 (2010)
Article history
Received:
August 06 2009
Accepted:
January 04 2010
Citation
M. M. Patterson, A. Cochran, J. Ferina, X. Rui, T. A. Zimmerman, Z. Sun, M. J. Kramer, D. J. Sellmyer, J. E. Shield; Early stages of direct FePt nanocluster formation: The effects of plasma characteristics. J. Vac. Sci. Technol. B 1 March 2010; 28 (2): 273–276. https://doi.org/10.1116/1.3298888
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