The authors have grown MnAs on highly oriented pyrolytic graphite (HOPG), a strain-free and inert substrate, using molecular beam epitaxy. MnAs on HOPG grows in the form of particles, which self-assemble to form wirelike structures along the step edges on the HOPG surface. The MnAs particles have an average height of 42 nm and a diameter of 240 nm. Vibrating sample magnetometry studies indicate that the samples are ferromagnetic with no observable in-plane anisotropy, which is expected from a sample with a random distribution of particle orientations. Magnetic force microscopy (MFM) results indicate that the magnetic coupling between particles is less than that within each particle, and likely a dipole-dipole interaction, giving rise to magnetization patterns for the wires. Temperature dependent MFM measurements yield a Curie temperature of 330 K. Scanning tunneling microscopy and scanning tunneling spectroscopy were used to investigate the electronic density of states of MnAs, with the well-studied HOPG surface as a convenient reference.
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May 2010
Research Article|
April 27 2010
Molecular beam epitaxy growth and characterization of self-assembled MnAs wires on highly oriented pyrolytic graphite
S. Hegde;
S. Hegde
Department of Physics,
The State University of New York at Buffalo
, Buffalo, New York 14260
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E. Fraser;
E. Fraser
Department of Physics,
The State University of New York at Buffalo
, Buffalo, New York 14260
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J. Kwon;
J. Kwon
Department of Physics,
The State University of New York at Buffalo
, Buffalo, New York 14260
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a)
Electronic mail: [email protected]
J. Vac. Sci. Technol. B 28, C3E6–C3E9 (2010)
Article history
Received:
October 09 2009
Accepted:
February 01 2010
Citation
S. Hegde, E. Fraser, J. Kwon, H. Luo; Molecular beam epitaxy growth and characterization of self-assembled MnAs wires on highly oriented pyrolytic graphite. J. Vac. Sci. Technol. B 1 May 2010; 28 (3): C3E6–C3E9. https://doi.org/10.1116/1.3357280
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