At what--if any--temperature does a magnet melt and is a melted magnet still magnetic?
There is no single answer to this question, because a magnet can be made of many different materials, each of which has a different melting point. But most magnets are made of iron, which melts at 1535 C, or steel, the most common alloys of which typically melt at about 1370 C. Magnets lose their magnetization when liquid, and in fact long before that point. Magnets are magnetic because tiny regions of the metal are aligned parallel to each other. When the metal softens, these regions are free to rotate and the magnet de-magnetizes.
when people are prone to get in a shock state, or already are in this state, they need blankets to keep the body warm
Probably because it's cold outside.
Ferromagnetism (the precise term for what is commonly called magnetism) is caused by the spontaneous alignment of the spins unpaired electrons in the atoms making up a material. As one heats a ferromagnetic material, the thermal energy tends to destroy this ordering. Every ferromagnetic material has a characteristic temperature (which varies from material to material) at which all the ordering has been destroyed, and the electron spins have random orientations. This temperature is called the Curie point or Curie temperature. Above this temperature, the material is no longer magnetic. See the first source for a table of Curie points for various ferromagnetic materials. Because the atoms in a liquid (i.e., a melted magnet) are in constant motion and are not frozen into relatively fixed positions, as in a solid, true liquids cannot be ferromagnetic. Any ferromagnetic material will become nonmagnetic (in the common sense of that word) before its melting temperature is reached. Note that there are things called magnetic fluids that consist of tiny solid particles of ferromagnetic material suspended in a viscous liquid. The magnetic properties of these materials are due to the suspended solids, not the liquid. As others have noted, the melting temperature of a magnet depends on the composition of the material that the magnet is made of.
