Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Magnetic Heuslers, Half-Metals and Oxides (jointly with MA)
TT 11.11: Vortrag
Montag, 16. März 2015, 12:15–12:30, H 0112
Highest Curie temperature in Co-Fe based Heusler compounds — •Julia Erika Fischer1, Siham Ouardi1, Gerhard Fecher1, Guido Kreiner1, Peter Adler1, Claudia Felser1, Simone Fabbrici2, and Franca Albertini2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Institute of Materials for Electronics and Magnetism CNR, Parma, Italy
Half-metallic ferromagnetic Co-based Heusler compounds are one of the most promising class of materials for high performance spintronic devices due to the recently experimentally demonstrated strong spin polarization and their reported high Curie temperatures [1, 2].
We have prepared a series of polycrystalline Co-Fe based Heusler alloys and studied the structural and magnetic properties. From thermomagnetic analysis measurements we found Curie temperatures of more than 1200 K, which are the highest values in Heusler alloys so far. Therefore, a higher thermal stability of magnetization is expected even for moderate device temperatures. In particular, the Co-Fe disorder was investigated by Mößbauer spectroscopy to study the influence on the magnetic properties.
[1] B. Balke et al., Sci. Technol. Adv. Mater. 9, 014102 (2008).
[2] M. Jourdan et al., Nat. Commun., 5 (3974), 1 (2014).