Magnetic reversal and magnetic memory effect in melt-spun Pr2Fe14B/α-Fe nanocomposite ribbons

The influence of CoCr addition on the microstructure and magnetic properties was investigated in nanocomposite Pr2Fe14B/α-Fe alloys prepared by melt spinning. It was shown that the magnetic properties of Pr2Fe14B/α-Fe nanocomposite were improved by an addition of 10 at.% CoCr, in particular, coercivity (jHc) from 4.9 up to 5.3 kOe, maximum energy product ((BH)max) from 10.6 up to 13.9 MGOe, and remanence (Mr) from 94.2 up to 98.4 emu/g. The field dependencies of the reversible and irreversible magnetization components were derived from the recoil loops. Combining with the initial magnetization curves, the results indicated that the pinning of domain walls at the grain boundaries dominated the magnetization reversal in Pr2Fe14B/α-Fe nanocomposite alloys. The magnetic memory effect was studied by measuring the magnetic moment relaxation at a cycle negative magnetic field with time interval of 600 s. The exchange-spring magnets with magnetic memory effect have a high potential for high density magnetic recording.

Graphical AbstractMagnetic memory effect in melt-spun CoCr-containing and CoCr-free ribbonsFigure optionsDownload as PowerPoint slide