Blog Categories

About Us has become the premier magnetic bracelet, copper bracelet and magnetic jewelry online catalog as a result of our commitment to one simple tenet - customer service.

Recent Posts

Blog Archive

  1. August 20151 Posts
  2. March 20151 Posts
  3. June 20141 Posts
  4. December 20131 Posts
  5. November 20131 Posts
  6. August 20131 Posts
  7. March 20132 Posts
  8. December 20121 Posts
  9. November 20121 Posts
  10. August 20121 Posts
  11. December 20111 Posts
  12. November 20112 Posts
  13. October 20113 Posts
  14. September 20111 Posts
  15. August 20113 Posts
  16. June 20111 Posts
  17. April 20112 Posts
  18. March 20113 Posts
  19. February 20112 Posts
  20. January 20115 Posts
  21. December 20102 Posts
  22. November 20101 Posts
  23. October 20105 Posts
  24. August 20105 Posts
  25. June 20101 Posts
  26. May 20101 Posts
  27. April 20101 Posts
  28. March 20104 Posts
  29. February 20105 Posts
  30. January 20106 Posts
  31. December 20096 Posts
  32. October 20096 Posts
  33. September 20095 Posts
  34. August 20096 Posts
  35. July 200912 Posts
  36. June 20094 Posts
  37. May 20096 Posts
  38. April 20095 Posts
  39. March 200910 Posts
  40. February 20094 Posts
  41. January 20094 Posts
  42. December 20089 Posts
  43. November 20084 Posts
  44. October 20081 Posts
  45. September 20086 Posts
  46. August 20082 Posts
  47. July 20081 Posts
  48. April 20081 Posts
  49. February 20083 Posts
  50. January 20089 Posts
  51. December 20074 Posts
  52. September 20072 Posts
  53. August 20071 Posts
  54. July 20073 Posts
  55. June 20079 Posts
  56. May 200719 Posts
  57. April 200734 Posts
  58. March 200748 Posts
  59. February 200722 Posts
  60. January 20077 Posts
  61. December 20061 Posts
  62. November 200622 Posts
  63. October 200611 Posts
  64. September 20062 Posts
  65. August 20065 Posts

Nov 26

Types of Magnets

 There are various types of magnets depending on their properties. Some of the most well known are listed below.

Permanent Magnets

These are the most common type of magnets that we know and interact with in our daily lives. E.g.; The magnets on our refrigerators. These magnets are permanent in the sense that once they have been magnetized they retain a certain degree of magnetism. Permanent magnets are generally made of ferromagnetic material. Such material consists of atoms and molecules that each have a magnetic field and are positioned to reinforce each other.


Permanent Magnets can further be classified into four types based on their composition: 1. Neodymium Iron Boron (NdFeB or NIB) 2. Samarium Cobalt (SmCo) 3. Alnico 4. Ceramic or Ferrite

NIB and SmCo are the strongest types of magnets and are very difficult to demagnetize. They are also known as rare earth magnets since their compounds come from the rare earth or Lathanoid series of elements in the periodic table. The 1970s and 80s saw the development of these magnets.

Alnico is a compound made of ALuminium, NIckel and CObalt. Alnico magnets are commonly used magnets and first became popular around the 1940s. Alnico magnets are not as strong as NIB and SmCo and can be easily demagnetized. This magnet is however, least affected by temperature. This is also the reason why bar magnets and horseshoes have to be taken care of to prevent them from loosing their magnetic properties.

The last type of permanent magnets, Ceramic or Ferrite magnets are the most popular today. They were first developed in the 1960s. These are fairly strong magnets but their magnetic strength varies greatly with variations in temperature.

Permanent Magnets can also be classified into Injection Moulded and Flexible magnets. Injection molded magnets are a composite of various types of resin and magnetic powders, allowing parts of complex shapes to be manufactured by injection molding. The physical and magnetic properties of the product depend on the raw materials, but are generally lower in magnetic strength and resemble plastics in their physical properties. Flexible magnets are similar to injection molded magnets, using a flexible resin or binder such as vinyl, and produced in flat strips or sheets. These magnets are lower in magnetic strength but can be very flexible, depending on the binder used.

Shape & Configuration

Permanent magnets can be made into any shape imaginable. They can be made into round bars, rectangles, horseshoes, donuts, rings, disks and other custom shapes. While the shape of the magnet is important aesthetically and sometimes for experimentation, how the magnet is magnetized is equally important. For example: A ring magnet can be magnetized S on the inside and N on the outside, or N on one edge and S on the other, or N on the top side and S on the bottom. Depending on the end usage, the shape and configuration vary.


Permanent magnets can be demagnetized in the following ways: - Heat - Heating a magnet until it is red hot makes it loose its magnetic properties. - Contact with another magnet - Stroking one magnet with another in a random fashion, will demagnetize the magnet being stroked. - Hammering or jarring will loosen the magnet's atoms from their magnetic attraction.

Temporary Magnets

Temporary magnets are those that simply act like permanent magnets when they are within a strong magnetic field. Unlike permanent magnets however, they loose their magnetism when the field disappears. Paperclips, iron nails and other similar items are examples of temporary magnets. Temporary magnets are used in telephones and electric motors amongst other things.


Had it not been for electromagnets we would have been deprived of many luxuries and necessities in life including computers, television and telephones. Electromagnets are extremely strong magnets. They are produced by placing a metal core (usually an iron alloy) inside a coil of wire carrying an electric current. The electricity in the current produces a magnetic field. The strength of the magnet is directly proportional to the strength of the current and the number of coils of wire. Its polarity depends on the direction of flow of current. While the current flows, the core behaves like a magnet. However, as soon as the current stops, the core is demagnetized.

Electromagnets are most useful when a magnet must be switched on and off as in large cranes used to lift cables and rods in construction.


These are the strongest magnets. They don't need a metal core at all, but are made of coils of wire made from special metal alloys which become superconductors when cooled to very low temperatures.

Posted by Jay Roberts at 04:25 AM | Permalink


TrackBack URL for this entry: