Temperature stability of flexible RE magnet-foils

Isotropic polymer-bonded RE magnet-foils with a width of approximately 30 cm were manufactured by the solvent casting technology. The thickness of the magnet-foils could be varied between 200 and 400 /spl mu/m. The remanent polarizations amount to 0.27 T for isotropic magnet-foils based on Sm/sub 2/(Co,Cu,Fe,Zr)/sub 17/ alloy-powders and to 0.41 T for isotropic magnet-foils made of rapidly solidified Nd-Fe-B alloy-powders. Intrinsic coercivities of approximately 8 kA/cm were achieved. The maximum energy densities range between 13.6 kJ/m/sup 3/ and 28.8 kJ/m/sup 3/, respectively. For saturation of the magnet-foils magnetizing field strengths up to 40 kA/cm are required. The temperature coefficients are similar to those of sintered magnets. The long-term temperature stability is mainly determined by the thermal aftereffect. The maximum continuous operating temperatures amount to 100/spl deg/C for Sm/sub 2/(Co,Cu,Fe,Zr)/sub 17/ magnet-foils and to about 80/spl deg/C for Nd-Fe-B magnet-foils.