Article

Science China Technological Sciences

, Volume 56, Issue 1, pp 36-39

Surface and internal magnetic domain structures of Fe-Ga alloy rods

  • YuNan HanAffiliated withSchool of Physics and Electronic Science, Hunan University of Science and TechnologyNational Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Email author 
  • , YongSheng LiAffiliated withGrirem Advanced Materials Co., Ltd, General Research Institute for Nonferrous Metals
  • , XiuFeng HanAffiliated withNational Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Email author 
  • , DunBo YuAffiliated withGrirem Advanced Materials Co., Ltd, General Research Institute for Nonferrous Metals

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Abstract

The magnetic domain structures of the 〈100〉 oriented Fe81Ga19 polycrystalline alloys with rapid quenching (RQ) and post-annealing (PA) thermal treatments are investigated by using magnetic force microscopy (MFM). The surfaces of the RQ alloy rods take on the dendritic domains after undergoing a standard mechanical polishing. While after PA processing, the distinct domain structures are observed at different temperatures. The wide stripe-like domain patterns appear in the surface of those PA rods at 550°C while the ramous domains remain at 400°C annealing. X-ray diffraction patterns indicate that a thin iron layer is formed on the surface of the specimens annealed at higher temperature. The soft magnetic iron layer, actually acting as a shield for the stray fields emerging from the internal magnetic structures underneath, brings about the presentation of the wide internal domains.

Keywords

Galfenol polycrystal magnetic force microscopy magnetic domains thermal treatment magnetostriction