Magnetostrictions of Sm(2)Fe(17) and Sm(2)Fe(17)N(3)

作者：Yang J B^*; Chen H Y; Zhang Y; Yang Y B; Chen X G; Liu S Q; Wang C S; Hang J Z; Du H L; Lian G J; Yang Y C

来源：IEEE Transactions on Magnetics, 2011, 47(10): 3621-3624.

DOI：10.1109/TMAG.2011.2154312

• Magnetic alignment
• magnetostriction
• permanent magnet
• Sm(2)Fe(17)N(3)

The magnetostrictions of Sm(2)Fe(17)N(3) and Sm(2)Fe(17) were investigated using strain gauge rotating-sample methods. In a magnetic field of 8T, the magnetostriction lambda(t) (lambda(t) = lambda(//) - lambda(perpendicular to) of Sm(2)Fe(17) is about -155 x 10(-6) at 300 K. It becomes positive after nitrogenation [Sm(2)Fe(17)N(3), lambda(t) is about +44 x 10(-6) at 300 K (H = 8T)] due to the crystal field effect and the exchange striction. It was noticed that inverse magnetostriction effect can be used to increase the magnetic alignment and remanence of the bonded magnets. As a result, transverse die-pressing (H perpendicular to P) was very effective in increasing the degree of magnetic alignment of Sm(2)Fe(17)N(3) powders, yielding remanence higher than that obtained by axial die-pressing (H//P). By increasing the degree of magnetic alignment of powders, the maximum energy product (BH)(max) of Sm(2)Fe(17)N(3) bonded magnet was improved by 15%.

• 出版日期2011-10
• 单位北京大学