Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Caloric Effects in Ferromagnetic Materials

MA 10.10: Vortrag

Montag, 20. März 2017, 17:45–18:00, HSZ 04

Magneto-optical imaging of magnetocaloric particle ensembles — •Anja Waske1, Alexander Funk1, Cecilia Bennati2,3, Francesco Laviano2, and Rudolf Schäfer11IFW Dresden — 2Politecnico of Torino — 3Istituto Materiali Elettronica e Magnetismo del Consiglio Nazionale delle Ricerche, Italy

A combination of 3D structural information obtained by X-ray computed tomography (XCT) with data of 2D methods like magneto-optical imaging or electron backscatter diffraction (EBSD) can expand the scope of these techniques by providing information in the third dimension, like e.g. the size and position of minority phases and defects hidden beneath the observed surface. For magnetocaloric materials, the nucleation and growth of the ferromagnetic phases was observed to strongly depend on such microstructural features [1]. We show that for La(Fe,Co,Si)13, alpha-Fe inclusions and cracks beneath the observed surface can have an impact on the magnetocaloric transition determined at the surface by e.g. magneto-optical imaging. Furthermore, the behavior of magnetocaloric particle ensembles can be tracked down to single particle behavior.

This work is supported by DFG through SPP 1599 Ferroic Cooling and BASF New Business.

1.Bennati, C., et al., JMMM 2016. 400, 339-343.

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