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Applied Physics Letters / Volume 86 / Issue 15 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 86, 152511 (2005); http://dx.doi.org/10.1063/1.1897827 (3 pages)

High-temperature ferromagnetism in pulsed-laser deposited epitaxial (Zn,Mn)O thin films: Effects of substrate temperature

A. K. Pradhan1, Kai Zhang1, S. Mohanty1, J. B. Dadson1, D. Hunter1, Jun Zhang2, D. J. Sellmyer2, U. N. Roy3, Y. Cui3, A. Burger3, S. Mathews4, B. Joseph4, B. R. Sekhar4, and B. K. Roul4

1Center for Materials Research, Norfolk State University, 700 Park Avenue, Norfolk, Virginia 23504
2Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0113
3Department of Physics, Fisk University, 1000, 17 Avenue North, Nashville, Tennessee 37208
4Institute of Physics, Sachivalaya Marg, Bhubaneswar-751 005, Orissa, India

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(Received 7 September 2004; accepted 18 February 2005; published online 8 April 2005)

We report on the observation of remarkable room-temperature ferromagnetism in epitaxial (Zn,Mn)O films grown by a pulsed-laser deposition technique using high-density targets. The optimum growth conditions were demonstrated from x-ray measurements, microstructure, Rutherford backscattering, micro-Raman, and magnetic studies. Superior ferromagnetic properties were observed in (Zn,Mn)O films grown at a substrate temperature of 500 °C and with an oxygen partial pressure of 1 mTorr. Ferromagnetism becomes weaker with increasing substrate temperature due to the formation of isolated Mn clusters irrespective of higher crystalline quality of the film.

© 2005 American Institute of Physics

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KEYWORDS and PACS

Keywords

zinc compounds, manganese compounds, ferromagnetic materials, II-VI semiconductors, semimagnetic semiconductors, wide band gap semiconductors, magnetic epitaxial layers, semiconductor epitaxial layers, semiconductor growth, pulsed laser deposition, magnetic hysteresis, crystal microstructure, Raman spectra, weak ferromagnetism, X-ray diffraction, Rutherford backscattering

PACS

  • 75.50.Pp

    Magnetic semiconductors

  • 75.50.Dd

    Nonmetallic ferromagnetic materials

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 81.15.Fg

    Pulsed laser ablation deposition

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 68.55.A-

    Nucleation and growth

  • 78.66.Li

    Other semiconductors

  • 68.55.-a

    Thin film structure and morphology

  • 78.30.Hv

    Other nonmetallic inorganics

  • 81.05.Hd

    Other semiconductors

  • 68.55.Nq

    Composition and phase identification

  • 68.55.Ln

    Defects and impurities: doping, implantation, distribution, concentration, etc.

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1897827

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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