Alnico magnets were developed in the early 1930’s. First used in military electronic applications during the Second World War, this type of magnet then spread very quickly for civilian purposes.
Made of an alloy of aluminum, nickel, cobalt and iron, alnico magnets have a reasonable cost compared to other materials such as neodymium magnets for example. With a maximum operating temperature of 500°C, alnico magnets are particularly suitable for specific applications in the aerospace and automotive (sensors). However, alnico magnets are very sensitive to demagnetization factors and therefore must comply with certain shapes and length/diameter ratios to prevent this phenomenon.