AUTOMATIC TORQUE MAGNETOMETER FOR VACUUM-TO-HIGH-PRESSURE HYDROGEN ENVIRONMENTS

An automatic torque magnetometer has been developed for use in high-pressure hydeogen. It will contain pressures ranging from vacuum to 200 atm of hydrogen gas at sample temperatures greater than 400 °C. This magnetometer, which uses an optical lever postion sensor and a restoring force technique has an operating range of 2.0×103 dyn cm to l.6×10-4 dyn cm. An accompanying digital data collection system extends the sensitivity to 1×10-5 dyn cm as well as increasing the data handling capacity of the system. The magnetic properties of thin films in high-temperature and high-pressure hydrogen environments can be studied using this instruments.