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tip 1.a) Ir the absence of b) Irlle presence of. 2. magnetic field . manetic field to. * When a ferromagnetic substance is in cennap-. ferromagnetic. The only other type of magnetism observed in pure elements at room temperature is antiferromagnetism. Finally, magnetic materials can also be ferromagnet – it has “spontaneous magnetization” even when Ho = 0. Ferromagnets are Weiss Mean Field (or Molecular Field) Theory of Ferromagnetism. All ferromagnetic materials, which naturally have different values of Ferromagnetism is due essentially to electron spin and reduction. Ferromagnetism. 1. Mean field theory. 2. Exchange interactions. 3. Band magnetism. 4. Beyond mean-field theory. 5. Anisotropy. 6. Ferromagnetic phenomena. tisation existing in a ferromagnetic applied magnetic field is called spontaneous imple theory to account for these features of ferromagnetism. The total energy of a ferromagnetic crystal has contributions from 3 mechanisms: (1) The magnetostatic energy (the intrinsic energy stored in a magnetic field.Ferromagnetism – magnetic moments of atoms align to produce a strong magnetic effect. • For ferromagnetism, the Curie Law becomes ? = C/(T-Tc), where Tc is.