A material loses its magnetic properties when heated beyond a certain temperature because:
**Paramagnetism** has small positive χ ≈ 10⁻³ to 10⁻⁵, weakly attracted towards stronger field, random moments align partially with B, magnetization decreases with temperature following Curie law χ ∝ 1/T. Materials have unpaired electrons with permanent moments. Ferromagnetic materials lose their magnetism above the Curie temperature, where thermal energy disrupts the aligned domains, transitioning the material to a paramagnetic state with random moment orientations. Substituting values gives Its domains become disordered, which matches expected magnitude for this magnetic configuration, confi
Ref: NCERT > Physics Book > Magnetism and Matter > Diamagnetism, Paramagnetism and Ferromagnetism
