- #1
Kenny Low
- 1
- 0
Is it possible to magnetize steel (hard magnetic material) with an ac source?
Magnetising a hard magnetic material
In summary, to magnetize a hard magnetic material, a strong external magnetic field can be used. Some materials become magnetized due to the alignment of their atoms and electrons, while others do not due to their low concentration of magnetic elements. To demagnetize a hard magnetic material, a strong alternating magnetic field can be used. It is possible to reverse the polarity of a magnetized hard magnetic material by exposing it to a strong magnetic field in the opposite direction. The magnetization of a hard magnetic material can be affected by temperature, with high temperatures weakening or eliminating its magnetic properties and low temperatures increasing its strength.
- #2
Gokul43201
Staff Emeritus
Science Advisor
Gold Member
- 7,220
- 24
I'm quite certain it can not. An AC current makes an oscillating B-field. The time-averaged value of the B-field is therefore, zero. Hence, no magnetization greater than the remanence can be achieved, and depending on the frequency (keep in mind that the magnetization of a ferromagnet is a highly non-equilibrium process and time constants for changes in magnetization can be of the order of seconds, even at normal temperatures) it could be significantly smaller.
- #3
Jelfish
- 144
- 5
This sounds like a very dangerous home-made experiment waiting to happen 
1. How do you magnetize a hard magnetic material?
To magnetize a hard magnetic material, you can use a strong external magnetic field. This can be achieved by placing the material in close proximity to a permanent magnet or by using an electromagnet.
2. Why do some materials become magnetized while others do not?
Materials become magnetized when their atoms and electrons align in a specific way, creating a magnetic field. Materials with a high concentration of magnetic elements, such as iron, nickel, or cobalt, are more likely to become magnetized compared to materials with a low concentration of these elements.
3. How can you demagnetize a hard magnetic material?
To demagnetize a hard magnetic material, you can expose it to a strong alternating magnetic field. This disrupts the alignment of the atoms and electrons, reducing or eliminating the material's magnetism.
4. Is it possible to reverse the polarity of a magnetized hard magnetic material?
Yes, it is possible to reverse the polarity of a magnetized hard magnetic material. This can be achieved by exposing the material to a strong magnetic field in the opposite direction. This process is known as magnetization reversal.
5. How does temperature affect the magnetization of a hard magnetic material?
Temperature can affect the magnetization of a hard magnetic material in two ways. At high temperatures, the material's magnetic properties may weaken or even disappear entirely. On the other hand, at low temperatures, the material's magnetic properties may become stronger. This is known as the Curie temperature, where the material's atoms and electrons align in a more organized manner, increasing its magnetic strength.
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