Spontaneous Bubble Domain Formation in a Layered Ferromagnetic Crystal

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Science  18 Jun 1999:
Vol. 284, Issue 5422, pp. 1969-1971
DOI: 10.1126/science.284.5422.1969

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Magnetic domain structure on the surface of the layer-structured ferromagnet La1.4Sr1.6Mn2O7 was observed in the temperature range from 37 to 97 kelvin with a scanning Hall probe microscope. The sensitivity to temperature of the domain structure changes was large relative to that in conventional ferromagnets. The stable and spontaneous appearance of magnetic bubble domains without an external magnetic field was observed in the neighborhood of 70 kelvin. The phenomenon observed could provide a potential route toward magnetic bubble memory.

  • * To whom correspondence should be addressed. Present address: Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan. E-mail: fukumura{at}

  • Present address: Department of Electronic Systems Engineering, Tokyo Metropolitan Institute of Technology, Tokyo 191-0065, Japan.

  • Present address: Department of Physical Electronics, Hiroshima University, Higashihiroshima 739-8526, Japan.

  • § Present address: Institute of Industrial Science, University of Tokyo, Tokyo 106-8558, Japan.

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