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Investigation of the magnetic properties of Dy doped Nd-Fe-B permanent magnet by using Mössbauer spectroscopy

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Abstract

The crystal and the magnetic properties of (Nd35.00-x Dy x )Fe bal.Cu0.15Co1.50Al0.20Nb0.35B1.00 (wt.%; x = 3.50, 6.00, and 8.00) samples are investigated by using x-ray diffractometer (XRD), vibrating smple magnetometer (VSM), and Mössbauer spectrometer. The crystal structure is determined to be tetragonal with the P42/mnm space group. The saturation magnetization (M s ) decreases while the coercivity (H c ) increases with increasing Dy ion concentration. Based on the zero-filed-cooled (ZFC) curves, all the samples show spin reorientation, and the spin-reorientation temperature TSR decreases with increasing Dy ion concentration. The Mössbauer spectra measured at 295 K show decreasing < Hhf > with increasing Dy concentration, and the abrupt changes both in the magnetic hyperfine field (H hf ) and the electric quadrupole shift (E Q) at temperatures around T SR .

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Authors and Affiliations

  1. Department of Physics, Kookmin University, Seoul, 136-702, Korea

    Jung Tae Lim, HyunKyu Kim & Chul Sung Kim

  2. Corporate R&D Institute, Samsung Electro-Mechanics, Suwon, 443-743, Korea

    Sung Yong An & Kang Ryong Choi

Authors
  1. Jung Tae Lim
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  2. HyunKyu Kim
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  3. Chul Sung Kim
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  4. Sung Yong An
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  5. Kang Ryong Choi
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Correspondence to Chul Sung Kim.

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Lim, J.T., Kim, H., Kim, C.S. et al. Investigation of the magnetic properties of Dy doped Nd-Fe-B permanent magnet by using Mössbauer spectroscopy. Journal of the Korean Physical Society 66, 1913–1917 (2015). https://doi.org/10.3938/jkps.66.1913

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  • DOI: https://doi.org/10.3938/jkps.66.1913

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