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The Solid State

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Magnetic Properties

Magnetic Properties based on the behavior of substances when placed in the magnetic field, they are classified into five classes.

Table: Magnetic properties of solids

Properties Description Alignment of Magnetic Dipoles Examples Applications
Diamagnetic Feebly repelled by the magnetic fields. Non-metallic elements (excepts O2, S) inert gases and species with paired electrons are diamagnetic All paired electrons TiO2, V2O5, NaCl, C6H6(benzene) Insulator
Paramagnetic Attracted by the magnetic field due to the presence of permanent magnetic dipoles (unpaired electrons). In a magnetic field, these tend to orient themselves parallel to the direction of the field and thus, produce magnetism in the substances.

At least one unpaired electron

 

CuO,O2 Cu2+, TiO2 VO, VO3

Electronic appliances
Ferromagnetic Permanent magnetism even in the absence of magnetic field, Above a temperature called Curie temperature, there is no ferromagnetism.

Dipoles are aligned in the same direction

Fe, Ni, Co, CrO2 CrO2 is used in audio and video tapes
Antiferromagnetic This arises when the dipole alignment is zero due to equal and opposite alignment.   MnO, MnO2, Mn2O, FeO, Fe2O3; NiO, Cr2O3, CoO, Co3O4,
Ferrimagnetic

This arises when there is net dipole moment

  Fe3O4, ferrites

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