Effects of growth temperature on the structural and magnetic properties of epitaxial Ni2MnIn thin films on InAs (001)

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Heusler alloy Ni₂MnIn thin films have been grown on InAs (001) by molecular beam epitaxy at growth temperatures ranging from 120 to 300 °C. For growth at 120 °C, transmission electron diffraction confirms the epitaxial growth of Ni₂MnIn in the B2 crystal structure on InAs (001) with an epitaxial relationship of Ni₂MnIn(001)<100>||InAs(001)<100>. Magnetic measurements show that the Ni₂MnIn film is ferromagnetic with a Curie temperature ∼170 K. However, for growth at 120 °C followed by a postgrowth anneal at 200 °C, a Curie temperature as high as 330 K was obtained. The increase in Curie temperature is attributed to the formation of partial L2₁ ordering in the Ni₂MnIn film, as determined by convergent beam electron diffraction.

Published in:
Journal of Applied Physics (Volume:97 , Issue: 7 )

Date of Publication: Apr 2005

Page(s):: 073901 - 073901-7
ISSN :: 0021-8979
Digital Object Identifier :: 10.1063/1.1868857
Product Type:: Journals & Magazines

Date of Current Version :: 18 June 2009
Issue Date :: Apr 2005

Author(s)

Xie, J.Q.
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
Lu, J. ; Dong, J.W. ; Dong, X.Y. ; Shih, T.C. ; McKernan, S. ; Palmstrøm, C.J.