A study on the structural and magnetic properties of 5-nm-thick Co–Pt alloy films grown on thermally oxidized substrates as well as on self-assemblies of spherical particles with sizes down to 10 nm is presented. An out-of-plane easy axis of magnetization was stabilized at deposition temperatures as low as in a broad composition range between 40 and of Pt. Owing to the low deposition temperatures, no chemical long-range order is found. Thus, the strong out-of-plane magnetic anisotropy is expected to be caused by anisotropic short-range order effects. The magnetic behavior of CoPt alloys with an equiatomic composition grown on arrays of particles was found to be similar to those on planar substrates. Structural investigations using high-resolution transmission electron microscopy revealed that a continuous CoPt layer has been formed, covering the particle tops and connecting them. The magnetic CoPt caps exhibit an out-of-plane easy axis for all particle sizes; however, no pronounced difference in coercive field with particle size was observed, which is associated with the specific morphology of the film structure.
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1 December 2009
Research Article|
December 15 2009
Nonepitaxially grown nanopatterned Co–Pt alloys with out-of-plane magnetic anisotropy
D. Makarov;
D. Makarov
a)
1Institute of Physics,
Chemnitz University of Technology
, D-09107 Chemnitz, Germany
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F. Klimenta;
F. Klimenta
b)
1Institute of Physics,
Chemnitz University of Technology
, D-09107 Chemnitz, Germany
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S. Fischer;
S. Fischer
2Department of Physics,
University of Konstanz
, D-78457 Konstanz, Germany
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F. Liscio;
F. Liscio
c)
3SIMAP,
INP Grenoble–CNRS–UJF
, 1130 Rue de la Piscine, BP75, 38402 Saint Martin d’Heres, France
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S. Schulze;
S. Schulze
1Institute of Physics,
Chemnitz University of Technology
, D-09107 Chemnitz, Germany
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M. Hietschold;
M. Hietschold
1Institute of Physics,
Chemnitz University of Technology
, D-09107 Chemnitz, Germany
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M. Maret;
M. Maret
3SIMAP,
INP Grenoble–CNRS–UJF
, 1130 Rue de la Piscine, BP75, 38402 Saint Martin d’Heres, France
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M. Albrecht
M. Albrecht
1Institute of Physics,
Chemnitz University of Technology
, D-09107 Chemnitz, Germany
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a)
Author to whom correspondence should be addressed. Electronic mail: denys.makarov@physik.tu-chemnitz.de.
b)
Present address: Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany.
c)
Present address: CNR-IMM Sezione di Bologna, 40129 Bologna, Italy.
J. Appl. Phys. 106, 114322 (2009)
Article history
Received:
July 14 2009
Accepted:
October 17 2009
Citation
D. Makarov, F. Klimenta, S. Fischer, F. Liscio, S. Schulze, M. Hietschold, M. Maret, M. Albrecht; Nonepitaxially grown nanopatterned Co–Pt alloys with out-of-plane magnetic anisotropy. J. Appl. Phys. 1 December 2009; 106 (11): 114322. https://doi.org/10.1063/1.3260243
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