Nanocomposite magnets are of importance because they are expected to provide a very high maximum‐energy product. Here is presented a route to α‐Fe/Sm2(Fe,Si)17Cx nanocomposite magnets with fine grain size below 10 nm. Annealing amorphous Sm8Fe85‐Si2C5 alloy under high pressure gives nanocomposite magnets (see Figure) with significantly increased coercivity and remnant magnetization.
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