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AlNiCo magnet is the first permanent magnet material developed. It is an alloy composed of aluminum, nickel, cobalt, iron, and other trace metals.　　AlNiCo’s permanent magnet materials were successfully developed in the 1930s. At that time, it had the best magnetic properties and a small temperature coefficient, so it was the most widely used and widely used in permanent magnet motors.https://www.zhijiangmagnet.com/product/smco-magnet/smco-arc-magnet/smco-tiles-2-2-2.html