Title :
Magnetic properties of Ga-added die-upset Nd-Fe-B magnets
Author :
Endoh, M. ; Tokunaga, M. ; Boltich, E.B. ; Wallace, W.E.
Author_Institution :
Hitachi Metals Ltd., Saitama, Japan
fDate :
9/1/1989 12:00:00 AM
Abstract :
The magnetic properties of Ga-added die-upset Nd-Fe-B magnets have been measured between 4.2 and 473 K. The die-upset magnets show a larger stepwise decrease in the demagnetization curve then a sintered magnet below the spin reorientation temperature because of the low alignment of grains in the die-upset magnets. In the temperatures range above room temperature, the high-coercivity Ga-added die-upset magnet has excellent properties compared with the Ga-free die-upset magnet. The addition of Ga increases the pinning force, resulting in the increase of i Hc
Keywords :
alloying additions; boron alloys; coercive force; demagnetisation; ferromagnetic properties of substances; gallium alloys; iron alloys; magnetic hysteresis; neodymium alloys; permanent magnets; 4.2 to 473 K; Nd-Fe-B-Ga; demagnetization curve; die-upset magnets; grain alignment; high-coercivity; hysteresis loops; intrinsic coercivity; magnetic properties; permanent magnets; pinning force; spin reorientation temperature; Coercive force; Demagnetization; Magnetic field measurement; Magnetic hysteresis; Magnetic materials; Magnetic properties; Saturation magnetization; Superconducting magnets; Temperature distribution; Vibration measurement;
Journal_Title :
Magnetics, IEEE Transactions on
