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Design and characterization of a field-switchable nanomagnetic atom mirror

Source: J. Appl. Phys. 108, 043906 (2010); doi:10.1063/1.3466995

Published 18 August 2010

KEYWORDS and PACS
Keywords
PACS
  • 78.20.Ls
    Magnetooptical effects (bulk materials/thin films)
  • 75.60.-d
    Magnetic domain effects, magnetization curves, and hysteresis
  • 75.50.Tt
    Fine-particle magnetic systems; nanocrystalline materials
  • 75.75.-c
    Magnetic properties of nanostructures
  • 37.10.-x
    Atom, molecule, and ion cooling methods
  • 42.79.Bh
    Optical lenses, prisms and mirrors
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9644 (online)
Publisher:
AIP is a member of CrossRef AIP
T. J. Hayward,1 A. D. West,2 K. J. Weatherill,2 P. J. Curran,3 P. W. Fry,4 P. M. Fundi,1 M. R. J. Gibbs,1 T. Schrefl,1 C. S. Adams,2 I. G. Hughes,2 S. J. Bending,3 and D. A. Allwood1
1Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JDUnited Kingdom
2Atomic and Molecular Physics Group, University of Durham, Durham, DH1 3LEUnited Kingdom
3Nanoscience Group, University of Bath, Bath, BA2 7AYUnited Kingdom
4Nanoscience and Technology Centre, University of Sheffield, Sheffield, S3 7HQUnited Kingdom
We present a design for a switchable nanomagnetic atom mirror formed by an array of 180° domain walls confined within Ni80Fe20 planar nanowires. A simple analytical model is developed which allows the magnetic field produced by the domain wall array to be calculated. This model is then used to optimize the geometry of the nanowires so as to maximize the reflectivity of the atom mirror. We then describe the fabrication of a nanowire array and characterize its magnetic behavior using magneto-optic Kerr effect magnetometry, scanning Hall probe microscopy, and micromagnetic simulations, demonstrating how the mobility of the domain walls allow the atom mirror to be switched “on” and “off” in a manner which would be impossible for conventional designs. Finally, we model the reflection of 87Rb atoms from the atom mirror's surface, showing that our design is well suited for investigating interactions between domain walls and cold atoms. ©2010 American Institute of Physics
History: Received 25 March 2010; accepted 25 June 2010; published 18 August 2010
Permalink: http://link.aip.org/link/?JAPIAU/108/043906/1

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