Magnetic susceptibility above the Curie temperature can be calculated from the Curie–Weiss law, which is derived from Curie's law. Higher temperatures make magnets weaker, as spontaneous magnetism only occurs below the Curie temperature. For example, the ordered magnetic moments ( ferromagnetic, Figure 1) change and become disordered ( paramagnetic, Figure 2) at the Curie temperature. Permanent magnetism is caused by the alignment of magnetic moments and induced magnetism is created when disordered magnetic moments are forced to align in an applied magnetic field. Materials have different structures of intrinsic magnetic moments that depend on temperature the Curie temperature is the critical point at which a material's intrinsic magnetic moments change direction. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. In physics and materials science, the Curie temperature ( T C), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. Above the Curie temperature, the magnetic spins are randomly aligned in a paramagnet unless a magnetic field is applied
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