Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Magnetic Materials III

MA 42.11: Vortrag

Donnerstag, 3. April 2014, 17:45–18:00, HSZ 04

Magnetic and magnetocaloric properties of the MnB system — •Maximilian Fries, Konstantin Skokov, and Oliver Gutfleisch — TU Darmstadt, Materialwissenschaften, 64287 Darmstadt

Magnetocalorics is a thriving research topic and materials that exhibit this effect become of high demand in case magnetic cooling can one day replace conventional refrigeration technologies. Especially materials with critical elements like rare earths, for example the reference material Gadolinium, are relevant in this field. To overcome this problem a lot of research is focused on finding materials which exhibit a magnetic transition (e.g. FM to PM) coupled to a structural transition at the desired transition temperature containing no critical elements. Such developments will reduce both raw material use and future technology cost. Here we report on the magnetic and structural properties of the compound MnB which undergoes a FM to PM transition at about 570K with minimal hysteresis, exhibiting an entropy change of 7 J/kgK in a field change of 0-2T. Furthermore we show results on the substitution in the compound MnxB in order to tune the Curie temperature and the magnetocaloric properties in this material system.