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Why rare earth magnets is it strong?
This is because taking advantage of the nature of the strong magnetic anisotropy with the rare earth elements.
Person who is engaged in research magnet's pouring heart and soul, the most is that either increase in what way the coercive force. Rare-earth magnets, are due to the compounds of 3d transition elements and rare earth constituting the magnet has the property of uniaxial anisotropy in particular.
A result of the magnetic moment of the atom is strongly bound in a specific direction in the crystal, this is called the property of the crystal is less likely to be magnetized in the direction of the other. The orientation of the magnetic moment because I is fixed in one direction, it will large magnetic field is very necessary if attempts to flip it. It is a thing that is coercive force is large.
Rare earth magnet is the following two types of primarily.
Neodymium magnet
I have the highest magnetic energy in being in magnet.
It consists of a neodymium-iron-boron, dysprosium primarily responsible for following each
has.
| Iron (Fe): Because permeability is likely to be high magnetization, I will influence the magnitude of the magnetic energy. |
| I maintain align the orientation of the iron atom in the direction of easy magnetization: neodymium (Nd). (Magnetic anisotropy) |
| Dysprosium (Dy):To improve the coercive force prevents demagnetization and thermal demagnetization field, but reduces the magnetic energy on the other hand. |
Samarium-cobalt magnet
and a high magnetic energy, second only to neodymium magnet, and excellent temperature characteristics.
It consists of cobalt and samarium primarily, magnetic anisotropy and high magnetic energy appeared that samarium is bound to the cobalt of a ferromagnetic material, high coercive force is also obtained.
1-5 system which is produced at a rate of 5 to 1 cobalt samarium was the mainstream Initially, improvements to or replacement of copper for high coercive force, the iron of the magnetic energy for improving the part of the cobalt It has led to the current 2-17 systems produced at a rate of 2 to 17 cobalt samarium of high performance becomes more mainstream, done.