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

被引：51

作者：

Meinert, Markus ^{[1
]}

Schmalhorst, Jan-Michael ^{[1
]}

Reiss, Guenter ^{[1
]}

Arenholz, Elke ^{[2
]}

机构：

[1] Univ Bielefeld, Dept Phys Thin Films & Phys Nanostruct, D-33501 Bielefeld, Germany

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2011年 / 44卷 / 21期

关键词：

HALF-METALLIC FERRIMAGNETISM; BAND-STRUCTURE CALCULATIONS; ALLOYS MN(2)VZ Z; MAGNETIC-PROPERTIES; NEUTRON-DIFFRACTION; MN2VAL; SEARCH; COBALT; ORDER; MN;

D O I：

10.1088/0022-3727/44/21/215003

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The quaternary full Heusler compound Mn2-xCoxVAl 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 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-neighbour Mn atoms couple antiferromagnetically. 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.

引用

页数：6

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