Title :
Magnetic aftereffect and magnetization processes of nanocrystalline α-Fe/Nd2Fe14B two-phase magnet alloys
Author :
Yao, J.M. ; Chin, T.S. ; Fang, J.S. ; Chen, S.K.
Author_Institution :
Dept. of Mater. Sci. & Eng., Tsing Hua Univ., Hsinchu, Taiwan
fDate :
11/1/1995 12:00:00 AM
Abstract :
Magnetic aftereffect and magnetization process of melt-spun nanostructured α-Fe/Nd2Fe14B two-phase alloys have been investigated. The heat-treated flakes composed of nanoscaled grain size show enhanced magnetic properties due to the intergranular exchange interaction similar to the exchange-spring behavior. The magnetization shows a logarithmic decay with the elapsed time in a steady field, being consistent with the Barbier plot and analytical results. The activation volume increases with increasing content of soft iron. The dc-demagnetization remanence data elucidate the irreversible demagnetization process. The soft iron phase, being responsible for reversible magnetization (Mrev), exchange-couples with the hard phase and lessens the Mrev
Keywords :
boron alloys; demagnetisation; exchange interactions (electron); ferromagnetic materials; grain size; heat treatment; iron; iron alloys; magnetic aftereffect; magnetic particles; magnetisation; magnetisation reversal; nanostructured materials; neodymium alloys; permanent magnets; remanence; soft magnetic materials; Barbier plot; Fe; Nd2Fe14B; activation volume; dc-demagnetization remanence; elapsed time; enhanced magnetic properties; exchange-spring behavior; hard phase; heat-treated flakes; intergranular exchange interaction; irreversible demagnetization process; logarithmic magnetisation decay; magnetic aftereffect; magnetization processes; melt-spun nanostructured α-Fe/Nd2Fe14B two-phase alloys; nanocrystalline α-Fe/Nd2Fe14B two-phase magnet alloys; nanoscaled grain size; reversible magnetization; soft Fe phase; Demagnetization; Iron; Magnetic anisotropy; Magnetic domain walls; Magnetic field measurement; Magnetization processes; Neodymium; Perpendicular magnetic anisotropy; Saturation magnetization; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on
