Effects of nanoindents on the martensitic transformation of Ni-Mn-Ga shape-memory Heusler films: A study by high-resolution imaging as a function of temperature

Ghahfarokhi, Milad Takhsha; Casoli, F.; Minnert, C.; Bruns, S.; Bruder, Enrico; Cabassi, R.; Durst, Karsten; Gutfleisch, Oliver; Albertini, F.

doi:10.1016/j.actamat.2022.118603

Cited by 5 publications

(2 citation statements)

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“…The blurred regions in Figure d are expected to be due to the material undergoing the martensitic transition at room temperature. Comprehensive structural and microstructural characterizations can be found in references. ,− …”

Section: Results and Discussionmentioning

confidence: 99%

“…Coherently, the high-resolution backscattered electron (BSE) image in Figure d shows the dominant presence of Y-type twining configurations and the small regions of X-type twining configurations, some of which are labeled in the figure. X-type and Y-type are characterized by different orientations of the twins (i.e., at 45° and 90° degrees to the MgO(001) substrate, respectively) in the martensitic phase. − As a consequence, they are also characterized by different magnetic anisotropy contributions, all in-plane for the Y-type and both in-plane and out-of-plane for the X-type. The blurred regions in Figure d are expected to be due to the material undergoing the martensitic transition at room temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

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Magnetic Shape-Memory Heuslers Turn to Bio: Cytocompatibility of Ni–Mn–Ga Films and Biomedical Perspective

Takhsha,

Furlani,

Panseri

et al. 2023

ACS Appl. Bio Mater.

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Magnetic shape-memory (MSM) Heuslers have attracted great attention in recent years for both caloric and magnetomechanical applications. Thanks to their multifunctional properties, they are also promising for a vast variety of biomedical applications. However, this topic has been rarely investigated so far. In this communication, we present the first report on the absence of cytotoxicity of MSM Heuslers in Ni−Mn−Ga epitaxial thin films and the perspective toward bioapplications. Qualitative and quantitative biological characterizations reveal that Ni−Mn− Ga films can promote the adhesion and proliferation of human fibroblasts without eliciting any cytotoxic effect. Additionally, our findings show that the morphology, composition, microstructure, phase transformation, and magnetic characteristics of the films are well preserved after the biological treatments, making the material a promising candidate for further investigations.

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