Physical Property Measurement System

Physical Property Measurement System (PPMS) with VSM option

The Physical Property Measurement System (PPMS) by Quantum Design allows the measurement of several functional properties with high resolution. The PPMS can be used to investigate electrical properties, heat capacities and magnet properties, among other things. A three-walled dewar allows the cooling of the measurement chamber down to about 5 K by using liquid nitrogen and liquid helium as refrigerants. Combined with special heating elements, a temperature range from 5 K to 1000 K is feasible for different kinds of measurements.
For high resolution magnetometry the PPMS at the Chair for MEMS Materials is equipped with a Vibrating Sample Magnetometer (VSM) option. This can be used to measure magnetic hysteresis loops and perform temperature-dependent magnetization measurements with a static applied magnetic field. The latter is useful for example for the determination of magnetic transition temperatures like the Curie temperature. A superconductive electromagnet is installed in the PPMS to create magnetic fields with a magnetic flux density of up to 7 T. The heat and cooling rates for temperature-sweep measurements lie between 0.01 K/min and 6 K/min.