Dannenberg, Antje; Siewert, Mario; Gruner, Markus; Wuttig, Manfred; Entel, Peter:
Structural ordering tendencies in the new ferromagnetic Ni-Co-Fe-Ga-Zn Heusler alloys
In: Physics Procedia, Vol. 10 (2010), pp. 144 - 148
2010article/chapter in journal
Physics (incl. Astronomy)
thp
Related: 1 publication(s)
Title:
Structural ordering tendencies in the new ferromagnetic Ni-Co-Fe-Ga-Zn Heusler alloys
Author:
Dannenberg, AntjeUDE
GND
101662011X
LSF ID
48398
Other
connected with university
;
Siewert, MarioUDE
LSF ID
51909
Other
connected with university
;
Gruner, MarkusUDE
GND
128899808
LSF ID
10281
ORCID
0000-0002-2306-1258ORCID iD
Other
connected with university
;
Wuttig, Manfred;Entel, PeterUDE
LSF ID
1127
Other
connected with university
Year of publication:
2010

Abstract:

In search for new ferromagnetic shape memory alloys (FSMA) we have calculated structural energy differences, magnetic exchange interaction constants and mixing energies of quaternary (X1X2)YZ Heusler alloys with X1,X2,Y=Ni,Co,Fe and Z=Ga, Zn using density functional theory. The comparison of the energy profiles of (NiCo)FeZ, (FeNi)CoZ, and (FeCo)NiZ with Z=Ga and Zn as a function of the tetragonal distortion c/a reveals that the energetically preferred ordering type is (NiCo)FeGa and (NiCo)FeZn which shows that Fe prefers to occupy the same cubic sublattice as Ga or Zn what implies that Fe favors Co and Ni as nearest neighbors, respectively. The Curie temperatures of (NiCo)FeGa and (NiCo)FeZn are high of the order of 600 K. (NiCo)FeGa, which has the same valence electron concentration (e/a=7.5) as Ni2MnGa and also possesses a high martensitic transformation temperature (>500 K), is of interest for future magnetic shape memory devices.