Ferrimagnetism and disorder of epitaxial Mn2-xCoxVAl Heusler compound thin films

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The quaternary full Heusler compound Mn{sub 2-x}Co{sub 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 (0 0 1) 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 Mn{sub 2}VAl (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 ... continued below

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215003

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Meinert, Markus; Schmalhorst, Jan-Michael; Reiss, Gunter & Arenholz, Elke January 29, 2011.

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The quaternary full Heusler compound Mn{sub 2-x}Co{sub 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 (0 0 1) 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 Mn{sub 2}VAl (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. Mn{sub 2}VAl is very sensitive to disorder involving Mn, because nearest-neighbour Mn atoms couple antiferromagnetically. Co{sub 2}VAl has B2 order and has reduced magnetization. In the cases with x {ge} 0.9 conventional ferromagnetism was observed, closely related to the atomic disorder in these compounds.

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215003

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  • Journal Name: Journal of Physics D: Applied Physics; Journal Volume: 44; Journal Issue: 21

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  • Report No.: LBNL-4724E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1088/0022-3727/44/21/215003 | External Link
  • Office of Scientific & Technical Information Report Number: 1026801
  • Archival Resource Key: ark:/67531/metadc837001

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  • January 29, 2011

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  • May 19, 2016, 3:16 p.m.

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  • July 28, 2016, 1:07 p.m.

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Meinert, Markus; Schmalhorst, Jan-Michael; Reiss, Gunter & Arenholz, Elke. Ferrimagnetism and disorder of epitaxial Mn2-xCoxVAl Heusler compound thin films, article, January 29, 2011; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc837001/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.