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Ferrimagnetism (Siti Arissa Nadia Binti Mohd Awal) - Coggle Diagram
Ferrimagnetism (Siti Arissa Nadia Binti Mohd Awal)
Introduction
Ferrimagnetism can be known as a combination of ferromagnetism and antiferromagnetism because of many similarities between them.
Ferrimagnets exhibit a spontaneous magnetic moment, hysteresis below their Curie temperature and behave paramagnetically above the Curie temperature.
Magnetic moments of ferrimagnets
align antiparalle
l to one another, net magnetic moment is
non-zero
.
Ferrimagnetic materials are widely used in non volatile memory devices. (eg: hard drive, high frequency devices)
Ferrimagnetic Materials
Ceramics, in particular,
Ceramic Oxides
.
The most widely used ferrimagnets in technological devices are materials known as
ferrites
.
Electrically insulating transitional-metal oxides
Often prepared by standard ceramic processing techniques
Magnetization of Ferrimagnetic Materials
The antiparallel magnetic moments in both ferrimagnetic and antiferromagnetic materials can be explained by the
super-exchange
behavior that occurs in oxide materials.
Example:
Manganese Oxide
Total magnetization of the crystal as the sum of magnetization on the A ad B sublattices :
Temperature Dependence
Similar to ferromagnetic materials. There is a Curie temperature at which the magnetic moments become randomized, causing ferrimagnetic materials to begin to behave paramagnetically.
Below the Curie temperature, the saturation magnetization of ferrimagnets decreases with increasing temperature until it vanishes completely at Curie Temperature
