Permanent Magnets: Interesting Things in Life and Production
Thanks to the ability to create a stable magnetic field without the need for electricity, permanent magnets have become an indispensable part, both serving daily living needs and effectively supporting production.
What is a permanent magnet?
MagnetPermanent magnets are magnets that can maintain their magnetism for a long time without requiring additional energy. They are often made from special materials such as:
● Ferrite (ceramic): cheap, durable, popular in speakers and electric motors.
● Alnico (aluminum – nickel – cobalt alloy): has high thermal stability.
● Samarium–cobalt (SmCo): good heat resistance, oxidation resistance.
● Neodymium (NdFeB): known as the "king of magnets" with an attraction force dozens of times stronger than ferrite magnets.
Although they are called “eternal”, in reality, their magnetism can still decrease over time or when exposed to high temperatures, strong impacts, or external magnetic fields. This limit point is called the Curie temperature – when exceeded, the magnet will completely lose its magnetism.
Unlike electromagnets, which require electric current to create a magnetic field, permanent magnets operate steadily and reliably, providing many practical applications.
Special properties
Permanent magnets possess several characteristics that make them unique materials:
● There are always two poles, North and South, with characteristic attractive and repulsive forces.
● Maintains stable magnetism for long periods of time.
● High demagnetization resistance, durable in many harsh environments.
● When moving near a wire, they can generate electricity thanks to the phenomenon of electromagnetic induction – the basic principle of a generator.
● Some non-metallic materials such as graphite or bismuth can be repelled by strong magnets, creating an interesting “levitation” phenomenon in experiments.
Diverse practical applications
●Health and wellness:In modern medicine, permanent magnets play an indispensable role. Typically in MRI machines – important diagnostic imaging equipment, requiring strong and stable magnetic fields to create detailed images for doctors.
In addition, magnetic bracelets, belts and pillows are also advertised to help blood circulation, reduce pain and improve sleep. Although their medical effectiveness is still controversial, it is undeniable that they have become a familiar part of life.
●Industry and engineering:Permanent magnets are the “heart” of many electronic devices: speakers, microphones, flashlights, computer hard drives, electric motors…
In production, they are also used to filter and separate iron from raw materials, ensuring safety for the processing line. In the food industry, removing small pieces of metal mixed in flour or cereal grains with magnets is a mandatory step.
●Energy and transportation:The principle of electromagnetic induction of magnets is the basis of generators and wind turbines, key devices in renewable energy production.
In transportation, magnets are present in high-speed maglev trains. They create a lifting force that helps the train “float” on the rails, reducing friction and reaching speeds of hundreds of kilometers per hour. This is a vivid demonstration of the potential of magnet technology in the future.
●Entertainment and daily life:Music and entertainment are associated with the presence of permanent magnets in speakers, headphones, microphones.
In the family, you can easily find them on the refrigerator door, puzzle toys, or intellectual game sets. Some magnetic therapy products are also chosen by many people as a drug-free relaxation method.
8 interesting facts about permanent magnets you may not know
- No power source required to operate.
- Made from a variety of materials, each with its own properties.
- Neodymium is the strongest magnet in the world today.
- Although “permanent”, magnetism can be lost due to heat, impact or external magnetic fields.
- Each type has its own Curie temperature – the threshold at which they completely lose their magnetism.
- Electricity can be generated by moving near a wire, thanks to electromagnetic induction.
- Some non-metallic materials can be repelled by magnets, creating a “levitation” effect.
- Applications span across a wide range of fields: medical, industrial, energy, entertainment.
From small conveniences like holding the refrigerator door shut or providing music in headphones, to the huge role they play in modern technologies like MRI machines and wind turbines, permanent magnets have been quietly improving the quality of our lives.
This is a clear proof that sometimes seemingly simple materials create great value for humanity. And with the continuous progress of science, the application of permanent magnets will certainly expand, promising many breakthroughs in the future.
Bina Vietnam International Company Limited
● Tax code: 0801335953
● Address: Room 403, Ocean Park Building, No. 1 Dao Duy Anh, Dong Da District, Hanoi.
● 0976 888 111 - Tu Hiep Industrial Cluster Factory - Thanh Tri - Hanoi City.
● 0976 888 111 - Tu Hiep Industrial Cluster Factory - Thanh Tri - Hanoi City. (Representative Office 01: No. 289 Thanh Am Street, Viet Hung Ward, Hanoi City 0961 33 22 55; Representative Office 02: Southwest Urban Area of Nam Sach, Hai Phong City 0984 326 088).
● Email:[email protected]
● Website:https://bina.com.vn/
