Title :
In Situ Observation of Domain Wall Pinning in Sm(Co,Fe,Cu,Zr)z Magnet by Lorentz Microscopy
Author :
Yue Tian ; Zhuang Liu ; Hui Xu ; Juan Du ; Jian Zhang ; Weixing Xia ; Renchao Che ; Aru Yan ; Liu, J. Ping
Author_Institution :
Key Lab. of Magn. Mater. & Devices, Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China
Abstract :
The microstructure and magnetic domain-wall motion of a sintered Sm(Co,Fe,Cu,Zr)z permanent magnet with different Cu and Fe contents was investigated by Lorentz transmission electron microscopy. The domain-wall motion under different magnetic fields indicates that most domain walls are strongly attracted by the SmCo5 boundary phases, but some of them are repulsed to the Sm2Co17 cell phase. Differences in Cu and Fe distribution at the SmCo5 cell boundary phase and the SmCo5/Sm2Co17 interface are considered to result in domain-wall behavior, and a larger Cu and a smaller Fe content in the sample make the attractive pinning force stronger and, therefore, coercivity is higher.
Keywords :
cobalt alloys; coercive force; copper alloys; iron alloys; magnetic domain walls; micromagnetics; permanent magnets; samarium alloys; sintering; transmission electron microscopy; zirconium alloys; Cu distribution; Fe distribution; Lorentz transmission electron microscopy; Sm(CoFeCuZr)z; Sm2Co17 cell phase; SmCo5 boundary phases; coercivity; domain wall pinning; magnetic domain-wall motion; magnetic fields; microstructure; pinning force; sintered permanent magnet; Coercive force; Iron; Magnetic domain walls; Magnetic domains; Microstructure; Perpendicular magnetic anisotropy; Coercivity mechanism; Lorentz TEM; Lorentz transmission electron microscopy (LTEM); Sm2Co17; coercivity mechanism; domain wall pinning;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2438007
