Science China Technological Sciences

, Volume 56, Issue 1, pp 36–39

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

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
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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 polycrystalmagnetic force microscopymagnetic domainsthermal treatmentmagnetostriction

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.School of Physics and Electronic ScienceHunan University of Science and TechnologyXiangtanChina
  2. 2.National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of SciencesBeijingChina
  3. 3.Grirem Advanced Materials Co., LtdGeneral Research Institute for Nonferrous MetalsBeijingChina