Physics – Condensed Matter – Materials Science
Scientific paper
2011-01-31
Meinert et al., J. Phys. D: Appl. Phys. 44, 215003 (2011)
Physics
Condensed Matter
Materials Science
10 pages, 4 figures
Scientific paper
10.1088/0022-3727/44/21/215003
The quaternary full Heusler compound Mn(2-x)Co(x)VAl with x = 1 is predicted to be a half-metallic antiferromagnet. Thin films of the quaternary compounds with x = 0...2 were prepared by DC and RF magnetron co-sputtering on heated MgO (001) substrates. The magnetic structure was examined by x-ray magnetic circular dichroism and the chemical disorder was characterized by x-ray diffraction. Ferrimagnetic coupling of V to Mn was observed for Mn2VAl (x = 0). For x = 0.5, we also found ferrimagnetic order with V and Co antiparallel to Mn. The observed reduced magnetic moments are interpreted with the help of band structure calculations in the coherent potential approximation. Mn2VAl is very sensitive to disorder involving Mn, because nearest-neighbor Mn atoms couple anti-ferromagnetically. Co2VAl has B2 order and has reduced magnetization. In the cases with x >= 0.9 conventional ferromagnetism was observed, closely related to the atomic disorder in these compounds.
Arenholz Elke
Meinert Markus
Reiss Günter
Schmalhorst Jan-Michael
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