Abrupt Change of NMR Line Shape in the Low Temperature Phase of Fe3O4

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  • Abrupt Change of NMR Line Shape in the Low Temperature Phase of Fe<SUB>3</SUB>O<SUB>4</SUB>
  • Abrupt Change of NMR Line Shape in the

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Temperature dependences of the NMR line shape were measured in the low temperature phase of magnetite. For the sample which was cooled to 4.2 K in an external magnetic field, we found an abrupt change of line shape at about 26 K. This phenomenon must be caused by the changing of an electron ordering structure in the magnetic domain walls and may be explained by use of a pinning plane model. That is, in the magnetically stabilized structure, a kind of plane in which the electron ordering structure is “abnormal” pins the major part of magnetic domain walls. The plane structure changes at 26 K and an ordinary structure of the magnetic domain is reconstructed drastically by the release of the magnetic domain walls from the plane.

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