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Chapter 26: Problem 21

Write short notes on (a) Ferrimagnetism (b) Super exchange

Short Answer

Expert verified
Ferrimagnetism is a type of magnetism where the magnetic moments within a material align in opposite, unequal directions, resulting in a net magnetic moment. Ferrimagnetic materials are resistant to demagnetization and have high permeability which makes them useful for various magnetic applications. Super-exchange interaction defines the magnetic interaction that happens between next-nearest neighbor ions, often through a nonmagnetic intermediary. The resulting interaction can be antiferromagnetic or ferromagnetic, depending on the angle between exchange pathway.

Step by step solution

01

Define Ferrimagnetism

Ferrimagnetism is a type of magnetism exhibited by ferrites and occurs when the magnetic moments within a material align in opposite directions, but not equally. This results in a net magnetic moment and therefore, the material displays magnetic properties.
02

Explain characteristics of Ferrimagnetism

Ferrimagnetic substances, such as magnetite, have high resistance to demagnetization and high permeability. They also show a magnetic hysteresis. This behavior makes them useful in applications such as magnetic memory, and as cores for transformers and magnetic shields.
03

Define Super Exchange

Super-exchange interaction is a type of magnetic interaction which occurs between next-nearest neighbor ions through a nonmagnetic intermediary ion or ligand.
04

Explain characteristics of Super Exchange

This type of interaction is particularly evident in transition metal compounds and results in an antiferromagnetic interaction if the angle between exchange pathway is 180° while it may result in ferromagnetic interaction if the angle is 90°. The energy depends heavily on the angle between the interacting orbitals or bonds.

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