Magnetic properties of Ga-added die-upset Nd-Fe-B magnets

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/sub Hc/.<
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