Investigation of the Magnetic Properties of Dy doped Nd-Fe-B Permanent Magnet by Using M¨ossbauer Spectroscopy
Investigation of the Magnetic Properties of Dy doped Nd-Fe-B Permanent Magnet by Using M¨ossbauer Spectroscopy
임정태(국민대학교); 김현규(국민대학교); 김철성(국민대학교); Sung Yong An(Samsung Electro-Mechanics); Kang Ryong Choi(Samsung Electro-Mechanics)
66권 12호, 1913~1917쪽
초록
The crystal and the magnetic properties of (Nd35.00−xDyx)Febal.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 M¨ossbauer spectrometer. The crystal structure is determined to be tetragonal with the P42/mnm space group. The saturation magnetization (Ms) decreases while the coercivity (Hc) 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 M¨ossbauer spectra measured at 295 K show decreasing < Hhf > with increasing Dy concentration, and the abrupt changes both in the magnetic hyperfine field (Hhf ) and the electric quadrupole shift (EQ) at temperatures around TSR.
Abstract
The crystal and the magnetic properties of (Nd35.00−xDyx)Febal.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 M¨ossbauer spectrometer. The crystal structure is determined to be tetragonal with the P42/mnm space group. The saturation magnetization (Ms) decreases while the coercivity (Hc) 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 M¨ossbauer spectra measured at 295 K show decreasing < Hhf > with increasing Dy concentration, and the abrupt changes both in the magnetic hyperfine field (Hhf ) and the electric quadrupole shift (EQ) at temperatures around TSR.
- 발행기관:
- 한국물리학회
- 분류:
- 물리학