What is the term for the temperature at which a ferromagnetic material loses its magnetic field?

The temperature at which a ferromagnetic material loses its magnetic properties is referred to as the Curie temperature. At this specific temperature, the thermal energy becomes sufficient to disrupt the alignment of magnetic moments within the material, causing it to transition from a ferromagnetic state, where the material exhibits a permanent magnetic field, to a paramagnetic state, where it can only become magnetized in the presence of an external magnetic field.

This phenomenon is critical in understanding the behavior of ferromagnetic materials, as it determines the operational limits of these materials in applications such as electromagnets, magnetic storage devices, and magnetic sensors. In contrast, the other terms do not specifically pertain to the loss of magnetism in ferromagnetic materials: the melting point is related to the phase change from solid to liquid, critical temperature is often used in the context of superconductors, and phase transition temperature could refer broadly to any change of state, not specifically related to magnetism.