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Magneto Optical Imaging

The Magneto Optical Imaging technique is based on Faraday effect , ie., the rotation of the light polarization induced by the magnetic field, as shown in figure 1.

Fig. (1) Faraday effect

The Faraday effect can be used to detect the magnetic field distribution on a specimen surface by using an "indicator" film. We use a ferrimagnetic bismuth-substituted yttrium iron garnet film (Bi-YIG) with in-plane spontaneous magnetization. Application of a perpendicular magnetic field on such an indicator film will creat an out-of-plane component of the magnetization which is responsible for the Faraday rotation. If the indicator is put on a magnetic specimen, the local Faraday rotation is determined by the out-of-plane component of local magnetic field on the specimen surface, and can be detected optically. For more details about this technique, see the recent reviews:

  1. Magneto-optical studies of current distributions in high-Tc superconductors
    Ch. Jooss, J. Albrecht, H. Kuhn, S. Leonhardt and H. Kronmueller
    Rep. Prog. Phys. 65 (2002) 651-788
  2. Magneto-optical investigations of superconductors
    M. R. Koblischka and R. J. Wijngaarden,
    Supercond. Sci. Technol. 8 (1995) 199-213
  3. Vizualisation of magnetic flux in magnetic material and high temperature superconductors using farady effect in ferrimagnetic garnet films
    Polyanskii, A. A., Cai, X. Y., Feldmann, D. M. and Larbalestier, D. C., Nano-crystalline and Thin Film Magnetic Oxides (NATO Science Series 3, High Technology 72) eds. I. Nedkov and M. Ausloos (Kluwer Academic Publishers: Netherlands) p. 353-370.

Fig. (2) The sketch of our MOI system

Fig. (3) A picture of the system



  • PPMS-Magneto transport and thermodynamics measurement system with 9 Tesla superconducting magnet: R-T; IV measurement; Hall effect; Specific heat, Thermal conductivity, Angular Rotator, Nernst effect; ac, dc magnetization; thermal electric power etc.
  • Photolithograph, Focused Laser patterning
  • SQUID magnetometer with options of ac magnetization, ultra-low field, extended dynamic range, and high temperature oven. 
  • AC loss       

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Last Modified: January 31, 2008
Please forward all questions about this site to: Kim Mohanty

DOE, Office of Science One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven Science Associates, a limited-liability company founded by the Research Foundation for the State University of New York on behalf of Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

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