Barnett effect

The Barnett effect is the magnetization of an uncharged body when spun on its axis.

The magnetization occurs parallel to the axis of spin.

Barnett was motivated by a prediction by Owen Richardson in 1908, later named the Einstein–de Haas effect, that magnetizing a ferromagnet can induce a mechanical rotation.

He instead looked for the opposite effect, that is, that spinning a ferromagnet could change its magnetization.

He established the effect with a long series of experiments between 1908 and 1915.