What is Magnetization?

- Sep 04, 2020-

Magnetization refers to the phenomenon that under the action of a magnetic field, the orientation of the magnetic moments in the material tends to be uniform when the magnetic moments are arranged, which shows a certain degree of magnetism.

The process of obtaining magnetism from a substance that does not originally have magnetism. Some objects will show magnetism under the action of magnets or electric current. This phenomenon is called magnetization.

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Ferromagnetic materials can be magnetized in the following ways:

1. Placing the item in an external magnetic field will result in the item retaining some of the magnetism on removal.

2. Placing the item in a solenoid with a direct current passing through it.

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When magnetizing objects, the results will be considered to be "soft" or "hard":

1. A "soft" or "impermanent" magnet is one that loses its memory of previous magnetizations. "Soft" magnetic materials are often used in electromagnets to enhance (often hundreds or thousands of times) the magnetic field of a wire that carries an electrical current and is wrapped around the magnet; the field of the "soft" magnet increases with the current.

2. A "hard" or "permanent" magnet is one that stays magnetized for a long time, such as magnets often used in refrigerator doors and magnetic jewellery. Permanent magnets occur naturally in some rocks, particularly lodestone, but are now more commonly manufactured.

A magnet's magnetism decreases when it is heated and increases when it is cooled.

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