2026-07-27 カリフォルニア大学サンディエゴ校（UCSD）
＜関連情報＞
- https://today.ucsd.edu/story/thin-films-dance-with-substrates
- https://www.science.org/doi/10.1126/science.adt9347
酸化物薄膜によって基板に刻まれた動的な非対称歪み Dynamic asymmetric strain imprinted into substrates by an oxide thin film
Elliot Kisiel, Alexandre Pofelski, Pavel Salev, Erbin Qiu, […] , and Alex Frano
Science Published:18 Jun 2026
DOI:https://doi.org/10.1126/science.adt9347
Abstract
In film-substrate systems, the substrate role is often considered to be limited to providing static mechanical constraints. Dynamic film-substrate interactions when a structural change in the film modifies the substrate are generally disregarded. Using combined x-ray and electron microscopies, we observed that an electrically induced filament in a vanadium dioxide film created strong asymmetric strain in an underlying sapphire substrate. This asymmetric substrate strain fed back into the film and defined the filament expansion direction, revealing the importance of film-substrate dynamic interactions in determining film functionality. Furthermore, the strain imprint propagated at least tens of micrometers deep into the substrate, exceeding the film thickness by more than 200-fold, potentially enabling substrate functionalization as an active mechanical coupling media in three-dimensional integrated microelectronic architectures.
