Samarium Cobalt Magnets and Ferrite Magnets – A Walkthrough

7211246509520 Samarium Cobalt Magnets and Ferrite Magnets – A Walkthrough

This post will discuss two types of magnets namely samarium cobalt and Ferrite. Samarium cobalt magnets are a type of rare earth magnet. Invented in 1966 by Dr. Karl J. Strnat, they are very expensive. Apart from them, there is only one other rare earth magnet namely neodymium magnets.

The magnetic field of samarium cobalt magnets is noticeably less than their aforementioned counterpart. The temperature at which they no longer posses any magnetism quite high and hence, they can be used at maximum temperatures.

Samarium cobalt magnets tend to be very brittle. Their resistance level to oxidization and demagnetization is also pretty high.

Use

These magnets are used in centrifugal pumps, the motors of racing cars, headphones, propellers, guitar pickups, and windmills. For obvious reasons, they are not as widely used as neodymium magnets or ferrite magnets.

Risks

Since they have a very powerful magnetic field, rare earth magnets such as samarium cobalt, demonstrate some distinctive hazards or risks such as:

 

  • Tendency to break and chip stemmed from their fragile nature.
  • The possibility of data being erased from hard drives and credit cards.
  • When these magnets are attracting a metal surface or two of these magnets are coming near to each other, they can crush bones. This is why; you should never be around during such events.

Ferrite Magnets

Ferrite magnets are a fusion of chemicals and ceramic materials. A main component in its composition is iron oxide. These magnets are non-conductive to electricity which means they do not transmit electricity. They are frequently used as permanent magnets.

Types

 

  1. Hard – Also called permanent magnets, hard ferrite magnets have high retention levels of magnetic properties.
  2. Soft – These magnets can interchange the direction of their polarity without the loss of much energy. Made from a blend of nickel, manganese, iron or zinc oxides.
  3. Ferrite Bead – The term refers to a lump of hard ferrite material. Comes with a coating of rubber or plastic. This magnet helps in preventing any interference in sound from radios.
  4. Ferrite Powder – Sharing their composition with hard ferrite magnets, these are available in a powdered form. A solid magnet is created by pressing it into the desired shape.

 

Use

 

  • Hard ferrite magnets are used in households as kitchen magnets.
  • Soft ones are used commonly in electromagnets or transformers.
  • Ferrite bead is used in radio, high-frequency cabling and inductors to filter electromagnetic impulses.
  • Originally, ferrite powder was used as a fine layer onto magnetic tapes to record and preserve sound materials.

 

Risks

 

  • Ferrite can lead to electromagnetic pollution
  • Ferrite filters do not work on the cables where direct current saturation level is producing impedance level higher than 60 ohms.

 

Hope you have found discussion on samarium cobalt magnets and ferrite magnet helpful. Thank you for reading.