Alnico magnet is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of aluminum (Al), nickel (Ni) and cobalt (Co), hence al-ni-co. They also include copper, and sometimes titanium. Alnico alloys are ferromagnetic, with a high coercivity (resistance to loss of magnetism) and are used to make permanent magnets. Before the development of rare earth magnets in the 1970s, they were the strongest type of magnet.
High-Quality Alnico Ring Magnets
Alnico magnets are comprised of Aluminium (Al), Nickel (Ni) and Cobalt (Co) together with small amounts of Iron, Copper and, occasionally Titanium. Alnico magnets are one of the oldest members of the magnet family and have been in existence for approximately 50 years. They are not as strong as Neodymium or Samarium Cobalt magnets but they are very stable over a wide temperature range and have a high magnetic flux density.
Physical Properties of Cast Alnico
Curie Temperature (℃)
Max. Operating Temperature (℃)
Relative Recoil Permeability (μrec)
Saturation Field Strength (kOe, kA/m)
Temperature Coefficient of Br (%/℃)
-0.025 ~ -0.02
Temperature Coefficient of iHc (%/℃)
+0.01 ~ +0.03
Strong AlNiCo Ring Magnet
Alnico rods are good electrical conductors because of the metallic composition. When rods (diameter smaller than thickness) are being used for open circuit applications the thickness should be approximately 5 times the diameter. However, because they are course-grained they are hard and brittle and must not be drilled, conventionally machined or used as structural components.
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