Mahdiyeh Ghorbani Zavareh – PhD student at HLD Dresden, Germany
I’m doing my PhD at Dresden High Magnetic Field Laboratory (HLD). After completing my master at the Isfahan University of Technology in Iran I decided to continue studying physics and delve deeper into research.
I’m currently measuring the magnetocaloric effect (MCE) in pulsed magnetic fields up to 70 Tesla in a variety of magnetic materials. The MCE is an intrinsic characteristic of magnetic solids and can be described as the thermal response (heating or cooling) of a magnetic substance when a magnetic field is applied or removed. Materials with large MCE can be used as a refrigerant in new generation of cooling devices.
The modern society relies on cooling technology for food safety, comfort, and medical application. For instance, around 15% of the German electricity demand is consumed for cooling processes (conditioning, refrigeration, freezing, chilling, etc.). Moreover, cooling devices based on the vapor-compression technology use greenhouse gases with low energy efficiency that contributes to global warming or substitute gases that are highly flammable. New MCE-based refrigerator technology could, therefore, be a very useful alternative.
Magnetocaloric cooling technology could be able to enter the market in the near future when engineers and scientists manage to build machines working at high operation frequency and performance with costs comparable to conventional devices. Since the pulsed-field facilities have typical pulses of 10 to 100 ms which match the targeted operation frequency of magnetic refrigerators (10–100 Hz), my research helps to investigate the dynamics of the MCE in a suitable frequency range and find suitable materials for future refrigeration.