Magnetic properties of pulsed laser deposition-fabricated isotropic Pr-Fe-B thick-films magnets for magnetic micro-machines

摘要

A preparation of Pr-Fe-B thick-film magnets by using a PLD (Pulsed Laser Deposition) method with the energy density at approximately 50 mJ/m~2 using the laser power of 2 W was effective to obtain the required magnetic properties for the application to a multi-polarly magnetized rotor. The isotropic films mainly consisted of Pr_2Fe_(14)B magnetic phase whose saturation magnetization is approximately 1.56 T, however the remanence (B_r) showed higher than 0.9 T. The obtained value of B_r was considered to be attributed to a remanence enhancement due to the interaction of Pr_2Fe_(14)B hard magnetic phases. Resultantly, the coercivity and (BH)_(max) of the samples exceeded 600 kA/m and 115kJ/m~3, respectively, which were larger than that of previously reported PLD-fabricated isotropic rare-earth based thick-films.