Low Elastic Spin Torque Sensor based on Angular Momentum Conservation Law

An ultra-sensitive torsional sensor that can respond to changes in the quantum spin states on a sample was developed. The beam was made of metallic glass to support the sensor stage and achieve high sensitivity. An experiment was conducted by applying a magnetic field to a magnetic sample on the device stage. Torsional movement was observed for the device with NiFe sample on the stage by changing the magnetic field at 0.6 mT, generating a rotational torque and a torsional displacement of 19.6 μm. The validity of the torque was examined by comparing it with theoretical values to eliminate any magnetic moment on the stage.