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Combinatorial Thin Film Synthesis of NiMnAl Magnetic Shape Memory Alloys Using MBE Technique

Published online by Cambridge University Press:  01 February 2011

R. Hassdorf ,
J. Feydt ,
S. Thienhaus ,
R. Borowski ,
M. Boese ,
T. Walther  and
M. Moske
R. Hassdorf
Affiliation:
Center of Advanced European Studies and Research (caesar), D-53175 Bonn, Germany
J. Feydt
Affiliation:
Center of Advanced European Studies and Research (caesar), D-53175 Bonn, Germany
S. Thienhaus
Affiliation:
Center of Advanced European Studies and Research (caesar), D-53175 Bonn, Germany
R. Borowski
Affiliation:
Center of Advanced European Studies and Research (caesar), D-53175 Bonn, Germany
M. Boese
Affiliation:
Universität Bonn, Institut für Anorganische Chemie, D-53117 Bonn, Germany
T. Walther
Affiliation:
Center of Advanced European Studies and Research (caesar), D-53175 Bonn, Germany
M. Moske
Affiliation:
Center of Advanced European Studies and Research (caesar), D-53175 Bonn, Germany
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Abstract

Composition spreads close to the Heusler alloy Ni2MnAl were grown onto 4-inch wafer substrates using molecular beam epitaxy. Compositional variations of up to 10 at.% relative to each constituent enable a direct comparison of the chemical-structural relationship with respect to martensitic transformation and to magnetic ordering as well as an efficient identification of the emerging phase stability regions. In this study, we set the primary focus on the structural aspects of the transformation behavior as observed by X-ray microdiffraction in combination with a specially designed heating stage. Notably, cross-sectional HRTEM imaging of the respective composition areas reveals a laminated two-phase martensitic structure inside the single grains, identified as a sequence of 2M and 14M variants. Stress relief upon transformation as observed by mechanical stress measurements reaches to 400 MPa depending on the composition. Magnetization measurements so far indicate field-induced ordering to occur at low temperatures, here, below 50 K which is assumed to be closely related to a high degree of structural disorder on the Mn-Al sublattice. Single-crystal thin films were realized by means of an epitaxial relationship to MgO (001).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D2.3
Copyright
Copyright © Materials Research Society 2004

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References

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