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Friday, 2 August 2019

Curie Point | Magnetostriction in Ferromagnetic Material

Curie Point in Ferromagnetic Material

The melting point of iron is 1539°C and above the point of melting the material becomes homogenous. Any ferro magnetic material looses its magnetic properties beyond a certain temperature. The temperature at which the ferro magnetic material loose the property of magnetism is called Curie Point. The curie point differs from material to material. Above the curie temperature the domain 'structure tends to disrupt and the domains loose their alignment and become irregular in position. Thus the material looses its ferro-magnetic property. This is also highly influenced by alloying with 30% nickel or 13% manganese. The alloys become non-magnetic even at room temperature. Curie temperature of some of the magnetic materials are given in the Table.



Curie Temperature of Magnetic Materials

No.
Material
Curie Temperature
1
Silicon Iron
690°C
2
Super Sil
700°C
3
Sandust
500°C
4
45 - Permalloy
440°C
5
78 - Permalloy
580°C
6
4 - 79 Permalloy
420°C
7
Hypernick
500°C
8
Mumetal
430°C
9
Supermalloy
400°C
10
Permendur
980°C
11
V - Permendur
980°C
12
Powder permalloy
480°C

Magnetostriction in Ferromagnetic Material 


When ferro magnetic substances are magnetized, there occurs small changes in its dimensions and this phenomenon is known as magnetostriction. Also it can be explained as when the direction of magnetisation is made to change, the atoms experiences a slight rearrangement resulting in slight changes in dimension of the crystal. The magnetic permeability is also related to magnetostriction and in divising high permeable material an effort is to be made to keep magnetostriction as low as possible.

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