Original scientific paper

Influence of heat treatment on the structural and magnetic characteristics of (Nd_xPr_1-x)₂Fe₁₄B-based magnetic material for low-temperature application

K. Skotnicová ; RMSTC, FMME, VŠB-TU Ostrava, Czech Republic
G. S. Burkhanov ; TEKHMA Co Ltd., Moscow, Russia
Y. S. Koshkid’ko ; International Laboratory of High Magnetic Fields and Low Temperatures, PAS, Wroclaw, Poland
D. Růžička ; RMSTC, FMME, VŠB-TU Ostrava, Czech Republic
T. Čegan ; RMSTC, FMME, VŠB-TU Ostrava, Czech Republic
J. Cwik ; International Laboratory of High Magnetic Fields and Low Temperatures, PAS, Wroclaw, Poland
N. B. Kolchugina ; TEKHMA Co Ltd., Moscow, Russia
A. A. Lukin ; JSC SPETSMAGNIT, Moscow, Russia
O. Životský ; RMSTC, FMME, VŠB-TU Ostrava, Czech Republic
K. Hrabovská ; RMSTC, FMME, VŠB-TU Ostrava, Czech Republic

Abstract

Sintered Pr-Nd-Fe-B-based permanent magnets with 10 and 13 wt. % of Pr were prepared by traditional technology and then subjected to various heat treatments. Stoichiometric composition of the matrix grains corresponds to (Pr_0.3Nd_0.7)₂Fe₁₄B and (Pr_0.4Nd_0.6)₂Fe₁₄B compounds, respectively. Conducted thermomagnetic analysis to samples of these magnets showed the presence of spin-reorientation transition in temperature 95 and 75 K, respectively. This makes the magnet potentially applicable for low temperatures. For these compounds, we have determined the optimum heat-treatment conditions. The magnetic domain structure of the magnet subjected to an optimum heat treatment has been studied. The effect of different low-temperature heat treatments on the magnetic properties of magnets has been demonstrated.

Keywords

Nd-Pr-Fe-B magnet; optimum heat treatment; spin-reorientation transition; domain structure

Hrčak ID:

157381

URI

https://hrcak.srce.hr/157381

Publication date:

1.10.2016.

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