What is it about?
A rotating object is magnetized along the rotation axis. This phenomenon is called the Barnett effect, in which an inertial field aligns each spin and produces magnetization. For electrons, the signal from the magnetization is on the order of picotesla to nanotesla, which has been difficult to measure especially at low temperatures. This paper reports the development of equipment for detecting the small signal by rotating a sample in a rotor at high speed up to kHz and using a fluxgate magnetic sensor under temperature control.
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Why is it important?
Precise measurements of the inertial field allow us to investigate a fundamental parameter of magnetic materials: the ratio of magnetic moment to angular momentum.
Perspectives
I hope our experimental approach to the primordial issue of magnetism paves the way for material design and engineering in the field of electronics and spintronics.
Maki Umeda
Read the Original
This page is a summary of: Temperature-variable apparatus for measuring Barnett field, Review of Scientific Instruments, June 2023, American Institute of Physics,
DOI: 10.1063/5.0142318.
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