4-7 June 2019
Arabella Brauneck Hotel
Europe/Berlin timezone
Abstract submission and registration open until Wednesday, 29th May.

Mechanism of the Magnetocaloric Effect in the Mn5-xFexSi3 Series

4 Jun 2019, 15:15
30m
Arabella Brauneck Hotel

Arabella Brauneck Hotel

Münchner Str. 25 83661 Lenggries
Talk Spin caloritronics Spin caloritronics

Speaker

Thomas Brückel (Forschungszentrum Jülich GmbH)

Description

Due to potential energy savings for room temperature applications, the magnetocaloric effect (MCE) has attracted increasing interest in the past years. We have performed extensive studies of structure, magnetism, magnetocaloric effect and spin dynamics in the Mn5-xFexSi3 series of compounds [1-5]. While the magnetocaloric effect is moderate for these compounds, they are composed of abundant and non-toxic elements and can be grown as large single crystals. This allows us to perform inelastic neutron scattering studies of the spin and lattice dynamics thus giving insight into the microscopic mechanism of the MCE. For the compound MnFe4Si3 a strong response of the critical fluctuations has been detected and identified as an important feature connected to the MCE effect [4]. The compound Mn5Si3 exhibits an inverse magnetocaloric effect. Inelastic neutron scattering reveals that contrary to the intuitively expected behavior, the application of a magnetic field can induce additional spin fluctuations giving rise to an increase of the magnetic entropy. This mechanism provides a microscopic explanation of the inverse magnetocaloric effect [5].

[1] M. Gottschlich et al; Journal of Materials Chemistry 22 (2012), 15275
[2] O. Gourdon et al; Journal of Solid State Chemistry 216 (2014), 56
[3] P. Hering et al; Chemistry of Materials 27 (2015), 7128
[4] N. Biniskos et al; Physical Review B 96 (2017), 104407
[5] N. Biniskos et al; Physical Review Letters 120 (2018), 257205

Primary authors

Nikolaos Biniskos (Juelich Centre for Neutron Science JCNS, Forschungszentrum Juelich GmbH, Outstation at ILL, Grenoble, France/CEA-Grenoble, INAC MEM, 38054 Grenoble, France) Karin Schmalzl (Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at ILL, Grenoble, France) Dr Stephane Raymond (2Universite ́ Grenoble Alpes, CEA, INAC, MEM, 38000 Grenoble, France) Jörg Voigt (Forschungszentrum Jülich) Karen Friese (Jülich Centre for Neutron Science, Research Centre Jülich) Jörg Perßon (Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, 52425 Jülich, Germany) Thomas Brückel (Forschungszentrum Jülich GmbH)

Presentation Materials

There are no materials yet.