Magnetic anisotropy of GaAs/Fe/Au core-shell nanowires grown by MBE

Tivakornsasithorn, K.; Pimpinella, R. E.; Nguyen, V.; Liu, X.; Dobrowolska, M.; Furdyna, J. K.

doi:doi:10.1116/1.3678203

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Journal of Vacuum Science & Technology B / Volume 30 / Issue 2 / 28th North American Molecular Beam Epitaxy Conference

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J. Vac. Sci. Technol. B 30, 02B115 (2012); http://dx.doi.org/10.1116/1.3678203 (4 pages)

Magnetic anisotropy of GaAs/Fe/Au core-shell nanowires grown by MBE

K. Tivakornsasithorn, R. E. Pimpinella, V. Nguyen, X. Liu, M. Dobrowolska, and J. K. Furdyna

Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556,

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(Published online 24 January 2012)

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GaAs/Fe/Au core-shell nanowires were grown on GaAs(111)B substrates by molecular beam epitaxy. Scanning electron microscopy images show that the Fe shell has successfully coated the sidewalls of GaAs nanowires. Magnetic anisotropy of GaAs/Fe core-shell nanowires was studied by ferromagnetic resonance and by superconducting quantum interference device magnetometer. The authors’ results show that the magnetic anisotropy of this novel core-shell nanowire system cannot be simply described by any known theory, as revealed by attempts to use micromagnetic simulation using the Object Oriented MicroMagnetic Framework. The observed features thus suggest the existence of a domain structure that is specific to this new system

ACKNOWLEDGMENTS

The authors thank Alexander Mukasyan and Tatyana Orlova at the Notre Dame Integrated Imaging Facility for their invaluable help. This work was supported by National Science Foundation Grant No. DMR10-05851.

Article Outline

INTRODUCTION
GROWTH AND EXPERIMENTAL SETUP
EXPERIMENTAL RESULTS
DISCUSSION
SUMMARY AND REMARKS

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KEYWORDS and PACS

Keywords

copper, ferromagnetic resonance, gallium arsenide, III-V semiconductors, interface magnetism, iron, magnetic anisotropy, magnetic domains, micromagnetics, molecular beam epitaxial growth, nanofabrication, nanomagnetics, nanowires, scanning electron microscopy, semiconductor-metal boundaries, SQUID magnetometers

PACS

75.30.Gw

Magnetic anisotropy
76.50.+g

Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
81.15.Hi

Molecular, atomic, ion, and chemical beam epitaxy
81.07.Gf

Nanowires
75.75.Cd

Fabrication of magnetic nanostructures
75.75.Fk

Domain structures in nanoparticles

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History

Received 16 September 2011
Accepted 26 December 2011
Published online 24 January 2012

Digital Object Identifier

http://dx.doi.org/10.1116/1.3678203

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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