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Abstract
We investigated the structure-property relationship of Co2MnSi Heusler thin films upon the irradiation with He+ ions. The variation of the crystal structure with increasing ion fluence has been probed using nuclear magnetic resonance (NMR) and transmission electron microscopy (TEM), and associated with the corresponding changes of the magnetic behavior. A decrease of both the structural order and the moment in saturation is observed. Specifically, we detect a direct transition from a highly L21-ordered to a fully A2-disordered structure type and quantify the evolution of the A2 structural contribution as a function of ion fluence. Complementary TEM analysis reveals a spatially-resolved distribution of the L21 and A2 phases showing that the A2 disorder starts at the upper part of the films. The structural degradation in turn leads to a decreasing magnetic moment in saturation in response to the increasing fluence.
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Details
1 IFW-Dresden, Institute for Solid State Research, Dresden, Germany (GRID:grid.14841.38) (ISNI:0000 0000 9972 3583)
2 Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany (GRID:grid.40602.30) (ISNI:0000 0001 2158 0612)
3 National Institute of Materials Science, Tsukuba, Japan (GRID:grid.21941.3f) (ISNI:0000 0001 0789 6880)
4 IFW-Dresden, Institute for Solid State Research, Dresden, Germany (GRID:grid.14841.38) (ISNI:0000 0000 9972 3583); Institute of Solid State and Materials Physics, TU Dresden, Dresden, Germany (GRID:grid.4488.0) (ISNI:0000 0001 2111 7257)