How do you magnetise a magnet?

28.9.2023

How to magnetise a magnet or metal object?

Magnetisation can be carried out in several ways depending on the type of material and the desired result. In practice, the most common methods use a strong permanent magnet, a current-carrying solenoid or other techniques based on the effect of a magnetic field.

You will learn the basic methods of magnetisation.
We will show the difference between home and professional methods.
We will explain which materials can be magnetised and which cannot.
We will point out the advantages and limitations of individual methods.
We will add suitable products for experiments, technical use and practical magnetisation.

You can magnetise a magnet or metal object in several ways depending on the type of material, its size and whether you need a temporary or more permanent magnetic effect. Different methods work on different principles, but they all have the same goal – to align the magnetic domains in the material in one direction.

In this article, we will look at the most common magnetisation methods, explain how they work and add practical advice for home and technical use.

What is needed for magnetisation?

For an object to be magnetised successfully, it must be made from a ferromagnetic material. This most commonly means iron, steel or special magnetic alloys. Materials such as copper, aluminium or brass cannot normally be magnetised in this way.

The success of magnetisation also depends on the strength of the magnetic field used, the duration of exposure, the quality of the material and whether you want to create a temporary magnetic effect or a more permanent magnet.

What works best?

For simple home experiments, the most practical option is usually to use a strong neodymium magnet. For technical or more precise magnetisation, a current-carrying solenoid or specialised magnetising equipment is also used.

Current-carrying solenoid

One classic method is to place a ferromagnetic object inside a solenoid, which is a coil carrying direct electric current. When current flows through the coil, a magnetic field is created that can magnetise the material inside.

This principle is also used in technical practice and clearly demonstrates the connection between electricity and magnetism. However, when working at home, electrical safety precautions must be followed.

Rubbing with a strong magnet

This is one of the simplest methods. It involves repeatedly moving a magnet over the surface of the material in the same direction. This gradually causes the magnetic domains in the material to align in one direction, creating magnetic polarisation.

For home experiments, this is a very practical method and is suitable, for example, for magnetising a nail, screwdriver or smaller steel rod.

Heating and hammering

Another historically known method is to heat a steel rod to a high temperature and then apply mechanical force, for example by hammering it while it cools. This process can alter the internal structure of the material and help create a magnetic moment.

In ordinary practice, this method is used only rarely and requires experience, precise temperature control and caution. It is therefore more suitable as an interesting or specialist method than as a normal home solution.

Using another strong magnet

One of the most common methods is to use a strong magnet to magnetise another object or a weakened magnet. The strong magnet is positioned so that it gradually acts on the target material and aligns its magnetic domains.

In practice, this is one of the most accessible methods, especially when using a strong neodymium magnet. It is often used for smaller metal objects or experiments with temporary magnetisation.

Electric current

For electromagnets or devices with a magnetic core, magnetisation can be achieved by supplying electric current to a coil. The resulting magnetic field acts on the core and causes it to become magnetised.

This principle is used in a wide range of technical devices and is one of the basic principles of electromagnetism. For ordinary home use, however, it is more suitable for users who have experience working safely with electrical circuits.

Thermal stabilisation

Some magnetic materials, such as samarium-cobalt or neodymium magnets, can under certain conditions be remagnetised by heating and subsequent cooling in a strong magnetic field. However, this is a technically demanding process that is not common for home use.

With these materials, the temperature also needs to be controlled very precisely because an incorrect procedure can instead lead to a loss of magnetic properties.

Special magnetising equipment

There are devices that generate very strong magnetic fields and are designed specifically for magnetising magnets or metal components. These devices are usually used in industry, magnet production or specialist operations.

Their advantage is precision and high performance, but they are generally neither available nor necessary for ordinary users.

Professional service

If you have a magnet or component that you need to magnetise but are unsure about the correct method, you can contact a professional service provider or magnet manufacturer. Specialists have the necessary equipment and experience and can determine a suitable magnetisation method for the specific material.

How can you tell whether magnetisation was successful?

The easiest way is a practical test. Try bringing the magnetised object close to small metal components, such as paper clips, screws or nails. If it starts attracting them, the magnetisation was successful.

The resulting strength depends on the material, the method used and the strength of the applied field. Some objects will function as weaker temporary magnets, while others will retain magnetism for longer.

What should you watch out for?

Not every metal can be magnetised.
Safety rules must be followed when working with electric current.
Strong neodymium magnets can be brittle and attract each other very suddenly.
Incorrect heating can damage the material or weaken its properties.

Which magnets are suitable for home experiments and magnetisation?

Smaller neodymium magnets are best suited for home and school experiments because they provide high strength at a small size. Ferrite magnets are suitable for basic experiments and simpler applications where an extremely strong magnetic effect is not required.

The advantage of finished magnets is that their strength and shape are known precisely and they can be used immediately without complicated manufacturing or experimentation.

Not sure which magnet to use?

Ferrite magnets are suitable for simpler home and school experiments. However, if you need high strength in a small size, we recommend neodymium magnets.

Frequently asked questions about magnetisation

Can every metal be magnetised?

No. Mainly ferromagnetic materials such as iron and steel can normally be magnetised. Copper, aluminium or brass cannot be magnetised in this way.

What is the simplest way to magnetise something at home?

The most common method is to use a strong permanent magnet and repeatedly stroke it along a ferromagnetic object in one direction.

What is the difference between a permanent magnet and an electromagnet?

A permanent magnet has magnetic properties continuously, while an electromagnet works only when electric current flows through it.

Can an object be magnetised using a coil?

Yes. If you place a suitable material inside a coil carrying direct current, it can become magnetised.

When is it better to use a finished magnet?

If you need a precise shape, known strength and immediate use, a finished ferrite or neodymium magnet is usually a more practical solution than magnetising something yourself.

Summary

Magnetisation can be carried out in several ways – using a strong permanent magnet, an electromagnet, a current-carrying coil or other specialised methods. For ordinary home use, however, it is easiest to work with finished magnets. Ferrite magnets are suitable for basic experiments and everyday use, while neodymium magnets provide significantly higher strength at small sizes.

Looking for magnets for experiments and everyday use?

Choose from ferrite and neodymium magnets for home, school and technical applications.

View magnet range