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The 2015 experiment used an air-driven nonmagnetic rotor containing polycrystalline gadolinium, with magnetic shielding and an external fluxgate magnetometer. Air drive reduced motor backgrounds. Measurements at 297–305 K were above the Curie temperature, at rotation frequencies up to 1.5 kHz. Reversing airflow reversed rotation and the magnetic signal; an empty capsule showed no speed-dependent signal. The readout measured stray magnetic field; geometry converted it to magnetization. Sample temperature was checked immediately after stopping. Heating and the conversion model limit inference.^[ref]

An additional analysis check follows from rotation symmetry. For signed sensor output $S$, separateAn ideal linear Barnett effect appears in the odd component; a fixed offset appears in the even component. This is a proposed diagnostic, not a claim about the paper's processing. A background correlated with direction can also be odd: reversal alone is insufficient. Empty-rotor checks, zero-speed readings, calibration of sensor polarity, and controlled temperature changes test different errors. Equatorial stray-field sign must also be converted to magnetization sign: for an axial magnetic dipole moment, the magnetic dipole field at its equator points opposite to that magnetic moment. The apparatus diagram makes this otherwise easy-to-miss sign change visible.

Eiji Saitoh coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

A fluxgate magnetometer uses a periodically driven magnetic core and pickup coils to measure a magnetic field.

Hiroyuki Chudo coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Jun’ichi Ieda coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Kazuya Harii coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Mamoru Matsuo coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Masao Ono coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Ryo Takahashi coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Sadamichi Maekawa coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]

Satoru Okayasu coauthored a Barnett effect experiment on gadolinium above its Curie temperature. A fluxgate magnetometer measured magnetization during rapid mechanical rotation, testing rotation-induced magnetic response in the regime of paramagnetism.^[ref]