Science China Technological Sciences

, Volume 56, Issue 1, pp 36–39

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

Authors

    • School of Physics and Electronic ScienceHunan University of Science and Technology
    • National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of Sciences
  • YongSheng Li
    • Grirem Advanced Materials Co., LtdGeneral Research Institute for Nonferrous Metals
    • National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of Sciences
  • DunBo Yu
    • Grirem Advanced Materials Co., LtdGeneral Research Institute for Nonferrous Metals
Article

DOI: 10.1007/s11431-012-5061-9

Cite this article as:
Han, Y., Li, Y., Han, X. et al. Sci. China Technol. Sci. (2013) 56: 36. doi:10.1007/s11431-012-5061-9

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 polycrystalmagnetic force microscopymagnetic domainsthermal treatmentmagnetostriction

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2012