Rotating sample magnetometer for cryogenic temperatures and high magnetic fields

TL;DR

This paper presents a compact rotating sample magnetometer designed for cryogenic temperatures and high magnetic fields, achieving high resolution and broad operational range in challenging conditions.

Contribution

The paper introduces a novel RSM design optimized for cryogenic and high-field environments, with significant improvements in resolution and operational range.

Findings

Achieves resolution exceeding typical vibrating sample magnetometers by tenfold.

Operates effectively across unprecedented temperature and magnetic field ranges.

Design overcomes space and low-temperature constraints for high-field measurements.

Abstract

We report on the design and implementation of a rotating sample magnetometer (RSM) operating in the variable temperature insert of a cryostat equipped with a high-field magnet. The limited space and the cryogenic temperatures impose the most critical design parameters: the small bore size of the magnet requires a very compact pick-up coil system and the low temperatures demand a very careful design of the bearings. Despite these difficulties the RSM achieves excellent resolution at high magnetic field sweep rates, exceeding that of a typical vibrating sample magnetometer by about a factor of ten. In addition the gas-flow cryostat and the high-field superconducting magnet provide a temperature and magnetic field range unprecedented for this type of magnetometer.