There is a type of magnet that has magnetism on one side and almost no magnetism on the other side, and is mostly made of ferrite material. We call this type of magnet single-sided multipolar ferrite.

Picture of a magnet with magnetism on the front and almost no magnetism on the back.

I don't think a large part of people have seen this type of magnet before. It uses a multipole charging pole number, allowing only one side of the magnetic circuit to open, because there is no single pole in the magnetic pole. Therefore, this type of magnet cannot be a single pole. Omi is the crater, surrounded by a magnetic field composed of several double poles, with the other side being non magnetic. This side is the neutral point of the S and N poles.

How do you see the distribution of magnetic circuits on the front with magnetism and almost no magnetism on the back?

Our magnetic steel manufacturers usually use magnetic testing plates. In the absence of magnetic testing plates, we can also use a layer of white paper on the magnet and sprinkle a little iron powder on the paper to clearly see the distribution of the magnetic field. This method can also see the composition of several pairs of magnetic poles.