What temperatures can magnets sustain depends on various factors such as: the material used (neodymium magnets or ferrite magnets),the temperature type and sharp of the magnet,and the position in group and so on.
EX:Neodymium magnets of the type N lose part of their magnetisation permanently at a temperature of 80 degree C, tapes and sheets at 85 degree C, ferrite magnets only at 250 degree C.
A vigorous cool-down (e.g. in liquid nitrogen) does not harm neodymium magnets, but ferrite magnets lose part of their magnetisation at a temperature of below -40 degree C; magnetic tapes and sheets already below -20 degree C.

Tags: neodymium magnets impact of temperature, magnets Smco magnets