Epitaxial lift-off of La$_{2/3}$Sr$_{1/3}$MnO$_3$ membranes enabled by BaO sacrificial layers and restoration of the Curie temperature
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910015515787264 |
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| author | Takeda, Takahito Matsubara, Daigo Wakabayashi, Yuki K. Yamagami, Kohei Seki, Munetoshi Tabata, Hitoshi Anh, Le Duc Kobayashi, Masaki Tanaka, Masaaki Ohya, Shinobu |
| author_facet | Takeda, Takahito Matsubara, Daigo Wakabayashi, Yuki K. Yamagami, Kohei Seki, Munetoshi Tabata, Hitoshi Anh, Le Duc Kobayashi, Masaki Tanaka, Masaaki Ohya, Shinobu |
| contents | Ultrathin complex-oxide membranes provide a powerful platform for strain engineering, interfacial control, and heterogeneous integration; however, their formation remains constrained by the availability and performance of suitable water-soluble sacrificial layers. This letter demonstrates that barium oxide (BaO) serves as a highly efficient and rapidly dissolving water-soluble sacrificial layer, enabling the epitaxial lift-off and transfer of ultrathin La$_{2/3}$Sr$_{1/3}$MnO$_3$ (LSMO) membranes onto SiO$_x$/Si substrates. LSMO membranes with a thickness of approximately 8 nm are released using a BaO sacrificial layer grown by molecular beam epitaxy, while high crystallinity is preserved and Ba interdiffusion is limited to a narrow interfacial region of approximately 0.5 nm. Post-transfer oxygen annealing at 600 ${}^\circ$C increases the Curie temperature ($T_C$) from 342 K to 346 K by eliminating Mn$^{2+}$ states associated with oxygen vacancies generated through oxygen extraction into the BaO layer. These results show that BaO provides a fast, scalable, and compositionally simple route for complex-oxide membrane release, while brief oxygen annealing is essential to restore the optimal Mn valence state and achieve the intrinsic high $T_C$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_07831 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Epitaxial lift-off of La$_{2/3}$Sr$_{1/3}$MnO$_3$ membranes enabled by BaO sacrificial layers and restoration of the Curie temperature Takeda, Takahito Matsubara, Daigo Wakabayashi, Yuki K. Yamagami, Kohei Seki, Munetoshi Tabata, Hitoshi Anh, Le Duc Kobayashi, Masaki Tanaka, Masaaki Ohya, Shinobu Materials Science Ultrathin complex-oxide membranes provide a powerful platform for strain engineering, interfacial control, and heterogeneous integration; however, their formation remains constrained by the availability and performance of suitable water-soluble sacrificial layers. This letter demonstrates that barium oxide (BaO) serves as a highly efficient and rapidly dissolving water-soluble sacrificial layer, enabling the epitaxial lift-off and transfer of ultrathin La$_{2/3}$Sr$_{1/3}$MnO$_3$ (LSMO) membranes onto SiO$_x$/Si substrates. LSMO membranes with a thickness of approximately 8 nm are released using a BaO sacrificial layer grown by molecular beam epitaxy, while high crystallinity is preserved and Ba interdiffusion is limited to a narrow interfacial region of approximately 0.5 nm. Post-transfer oxygen annealing at 600 ${}^\circ$C increases the Curie temperature ($T_C$) from 342 K to 346 K by eliminating Mn$^{2+}$ states associated with oxygen vacancies generated through oxygen extraction into the BaO layer. These results show that BaO provides a fast, scalable, and compositionally simple route for complex-oxide membrane release, while brief oxygen annealing is essential to restore the optimal Mn valence state and achieve the intrinsic high $T_C$. |
| title | Epitaxial lift-off of La$_{2/3}$Sr$_{1/3}$MnO$_3$ membranes enabled by BaO sacrificial layers and restoration of the Curie temperature |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.07831 |