Mechanisms of stress generation and relaxation during pulsed laser deposition of epitaxial FePd magnetic shape memory alloy films on MgO
| Autor: | Stefan G. Mayr, Jörg Buschbeck, Sebastian Fähler, C. Mickel, Tobias Edler |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
010302 applied physics
Physics business.industry General Physics and Astronomy Peening 02 engineering and technology Chemical vapor deposition I 021001 nanoscience & nanotechnology 01 natural sciences Pulsed laser deposition Stress (mechanics) Optics Magnetic shape-memory alloy 0103 physical sciences Stress relaxation Composite material Thin film 0210 nano-technology business Crystal twinning |
| Popis: | Mechanical stress generation during epitaxial growth of FePd thin films on MgO from pulsed laser deposition is a key parameter for the suitability in shape memory applications. By employing in situ substrate curvature measurements, we determine the stress states as a function of film thickness and composition. Depending on composition, different stress states are observed during initial film growth, which can be attributed to different misfits. Compressive stress generation by atomic peening is observed in the later stages of growth. Comparison with ex situ x-ray based strain measurements allows integral and local stress to be distinguished and yields heterogeneities of the stress state between coherent and incoherent regions. In combination with cross-sectional TEM measurements the relevant stress relaxation mechanism is identified to be stress-induced martensite formation with (111) twinning. peerReviewed |
| Databáze: | OpenAIRE |
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