It is recommended to design the field 3 times higher than the intrinsic coercivity to fully magnetize a material.
2.
A coil is wound around one of the magnets in a way that if we inject enough current ( in a pulse ) in the solenoid the generated magnetic field inside will be higher than the intrinsic coercivity of the magnet ( H _ { ci } ).
3.
It is important to mention that both magnets can be winding in the same coil, but it is necessary that one of the magnets have much lower intrinsic coercivity than the other in order to flip their magnetization direction without changing the other's direction of magnetization.
4.
During this explanation we use one magnet made of NdFeB and the other made of AlNiCo because both materials had the same remanence ( around 1.3T ) but AlNiCo has a lower intrinsic coercivity of 50kA / m while NdFeB has an intrinsic coercivity of 1120kA / m.
5.
During this explanation we use one magnet made of NdFeB and the other made of AlNiCo because both materials had the same remanence ( around 1.3T ) but AlNiCo has a lower intrinsic coercivity of 50kA / m while NdFeB has an intrinsic coercivity of 1120kA / m.
6.
The first and most important step is to design the solenoid that will create the magnetic field to reverse the magnetization of the AlNiCo . As mentioned before the AlNiCo has an intrinsic coercivity of 50kA / m so it is necessary to create a field of at least : B _ { apply } = \ mu _ { 0 } H _ { ci } = 62.8mT.
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