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Structure and Composition of Magnetocaloric Ni–Mn–In–Co Thin Films on the Nanoscale—A TEM Study
Author(s) -
Erkartal Burak,
Duppel Viola,
Niemann Robert,
Schultz Ludwig,
Fähler Sebastian,
Schürmann Ulrich,
Kienle Lorenz
Publication year - 2012
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201200072
Subject(s) - materials science , crystal twinning , nanoscopic scale , crystallography , nanostructure , stacking , electron microscope , transmission electron microscopy , microstructure , nanotechnology , composite material , optics , chemistry , nuclear magnetic resonance , physics
Abstract A complementary set of electron microscopy techniques is applied for the determination of structural and chemical segregation phenomena within a 300 nm thick metamagnetic Ni–Mn–In–Co thin film. The structure is predominantly composed of distinct modulated martensites of the 5M‐, 6M‐, 7M‐, and 8M‐type. Additionally these modulated structures exhibit twinning and stacking disordering. The nature of the disordering and the structural misfit at the twin interface were analyzed via high resolution micrographs. Next to an adhesion layer of Cr interdiffusion on the nanoscale was observed producing a penternary chemically and structurally homogeneous precipitate. The structure can be assigned to a twinned non‐modulated pseudocubic model.