MGML

Materials Growth & Measurement Laboratory

Ross H. Colman: Floating zone growth of low twinning stress magnetic shape memory crystals with low chemical segregation

Seminar on Magnetism
Date: Wednesday, 20 February 2019 14:10 - 15:10


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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.

 

Program

 

Floating zone growth of low twinning stress magnetic shape memory crystals with low chemical segregation

lecture given by:

Ross H. Colman

DCMP, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 2

The seminar takes place in the lecture room F2 
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 20.2. 2019 from 14:10 

Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

Magnetic shape memory alloys (MSMAs) have been considered for a range of technologically important applications such as actuating, sensing, pumping or energy harvesting. The majority of the proposed or realized applications require oriented single crystals and a range of single crystal growth techniques have been reported in the past, with directional solidification or Bridgman-Stockbarge being the most widely used. Due to the incongruently melting nature of Ni-Mn-Ga, the most widely studied MSMA, these techniques invariably lead to macroscopic chemical segregation along the crystal. Floating zone techniques can be used to grow crystals with sections of negligible macroscopic segregation, but additional complications with Ni-Mn-Ga growth make standard floating zone methods problematic. I will present our adaptations that have lead to the reproducible growth of single crystals with extremely low twinning stress. Also showing how the properties of our materials compare to industrially produced MSMAs.

 

Address
Ke Karlovu 2026/5, 120 00 Praha-Nové Město, Czech Republic

 

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All Dates


  • Wednesday, 20 February 2019 14:10 - 15:10