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Journal of Applied Physics / Volume 105 / Issue 11 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

J. Appl. Phys. 105, 113508 (2009); doi:10.1063/1.3138809 (7 pages)

Optical, structural, and magnetic properties of cobalt nanostructure thin films

D. Schmidt1, A. C. Kjerstad1, T. Hofmann1, R. Skomski2, E. Schubert1, and M. Schubert1

1Department of Electrical Engineering and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511, USA
2Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111, USA

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(Received 13 March 2009; accepted 23 April 2009; published online 2 June 2009)

We report on optical, structural, and magnetic properties of two substantially different cobalt nanostructure thin films deposited at an oblique angle of incidence of 85° away from the substrate normal. Comparison is made between an achiral columnar thin film grown without substrate rotation and a chiral nanocoil sculptured thin film by glancing angle deposition with substrate rotation. Generalized spectroscopic ellipsometry is employed to determine geometrical structure properties and the anisotropic optical constants of the films in the spectral range from 400 to 1000 nm. The magnetic properties are analyzed with a superconducting quantum interference device magnetometer. Both nanostructure thin films show highly anisotropic optical properties such as strong form birefringence and large dichroism. In particular, Co slanted columnar thin films are found to possess monoclinic optical properties. Magnetic measurements at room temperature show hysteresis anisotropy with respect to a magnetic field either parallel or perpendicular to the nanostructures’ long axis. We find extremely large coercive fields of approximately 3 kOe for our achiral columnar nanostructures.

© 2009 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORY
  3. EXPERIMENTAL
  4. RESULTS AND DISCUSSION
    1. Optical and structural properties
    2. Magnetic properties
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

birefringence, cobalt, coercive force, dichroism, ellipsometry, magnetic anisotropy, magnetic hysteresis, metallic thin films, nanostructured materials, optical constants

PACS

  • 78.66.Bz

    Metals and metallic alloys

  • 68.55.-a

    Thin film structure and morphology

  • 78.20.Fm

    Birefringence

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 75.30.Gw

    Magnetic anisotropy

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.3138809

PUBLICATION DATA

ISSN:

0021-8979 (print)  
1089-7550 (online)

Publisher:

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

For access to fully linked references, you need to log in.
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