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Journal of Applied Physics / Volume 97 / Issue 6 / MAGNETISM AND SUPERCONDUCTIVITY

J. Appl. Phys. 97, 063903 (2005); http://dx.doi.org/10.1063/1.1861512 (4 pages)

Domain-wall dynamics at micropatterned constrictions in ferromagnetic (Ga,Mn)As epilayers

J. Honolka1, S. Masmanidis1, H. X. Tang1, M. L. Roukes1, and D. D. Awschalom2

1Condensed Matter Physics 114-36, California Institute of Technology, Pasadena, California 91125
2Department of Physics, University of California, Santa Barbara, California 93106

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(Received 2 August 2004; accepted 19 December 2004; published online 4 March 2005)

The influence of sub-μm geometric constrictions on 90° magnetic domain-wall nucleation and propagation in stripes of ferromagnetic (Ga0.95,Mn0.05)As was explored. Measurements of the magnetic switching behavior were performed during ramping of an external magnetic field at constant rate and at constant field in the time domain. Demagnetizing fields are found to play a crucial role in the switching behavior around the region of the constriction. Depending on the sample’s initial magnetization the constriction can either assist domain-wall nucleation or hinder its propagation.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. SAMPLE FABRICATION AND PRINCIPLE OF MEASUREMENT
  3. EXPERIMENTAL RESULTS AND DISCUSSION
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

gallium arsenide, manganese compounds, ferromagnetic materials, magnetic semiconductors, III-V semiconductors, magnetic epitaxial layers, semiconductor epitaxial layers, magnetic domain walls, magnetic switching, demagnetisation, nucleation, magnetic anisotropy

PACS

  • 75.50.Pp

    Magnetic semiconductors

  • 75.50.Dd

    Nonmetallic ferromagnetic materials

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 75.70.Kw

    Domain structure (including magnetic bubbles and vortices)

  • 75.40.Gb

    Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.30.Gw

    Magnetic anisotropy

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1861512

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.
    K. W. Edmonds et al., Phys. Rev. Lett. 92, 037201 (2004).

    K. C. Ku et al., Appl. Phys. Lett. 82, 2302 (2003)APPLAB000082000014002302000001.

    Ahsan M. Nazmul, S. Sugahara, and M. Tanaka, Phys. Rev. B 67, 241308 (2003).

    H. X. Tang, R. Kawakami, D. D. Awschalom, and M. L. Roukes, Phys. Rev. Lett. 90, 107201 (2003).

    S. J. Potashnik et al., Phys. Rev. B 66, 012408 (2002).

    J. A. Osborn, Phys. Rev. 67, 351 (1945).


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