= Barnett effect
{c}
{tag=Magnetization}
{wiki}
The <Barnett effect> is the change of a body's <magnetization> caused by mechanical rotation. Turning the whole specimen can bias the internal <angular momentum> carrying its <magnetic moments>, even with zero applied <magnetic field>. It is the reciprocal physical question to the <Einstein-de Haas effect>: impose rotation and measure <magnetization>, rather than change <magnetization> and observe mechanical motion. The relation between the two becomes especially transparent when the same signed <gyromagnetic ratio> connects <magnetic moment> and internal <angular momentum>.
<Samuel Jackson Barnett> published https://journals.aps.org/pr/abstract/10.1103/PhysRev.6.239[Magnetization by Rotation] on 1 October 1915 in Physical Review. The <Barnett rotation magnetometry experiment> below provides an inspected modern example. The important distinction is between an equivalent term in a <Hamiltonian> and the actual external <magnetic field> measured by a <magnetometer>: the first biases the material; its resulting <magnetization> produces the second.
Back to article page
