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1. Correlation between epitaxial strain and magnetic properties in La _0.7 Sr _0.3 CoO ₃ /La _0.7 Sr _0.3 MnO ₃ bilayers

   https://doi.org/10.1063/1.5054003  

   Byers, J. Paige; Li, Binzhi; Chopdekar, Rajesh V.; Ditto, Jeffrey; Johnson, David C.; Takamura, Yayoi; Browning, Nigel D. (February 2019, Journal of Applied Physics)
2. Interface-driven magnetic anisotropy in relaxed La _0.7 Sr _0.3 CrO ₃ /La _0.7 Sr _0.3 MnO ₃ heterostructures on MgO

   https://doi.org/10.1063/5.0033236  

   Koohfar, Sanaz; Ozbek, Yasemin; Bland, Hayden; Zhang, Zhan; Kumah, Divine P. (February 2021, Journal of Applied Physics)
3. Strain- and thickness-dependent magnetic properties of epitaxial La _0.67 Sr _0.33 CoO ₃ /La _0.67 Sr _0.33 MnO ₃ bilayers

   https://doi.org/10.1063/5.0122009  

   Feng, Mingzhen; Ahlm, Nolan J.; Kane, Alexander M.; Chiu, I-Ting; Sasaki, Dayne Y.; Shafer, Padraic; N'Diaye, Alpha T.; Mehta, Apurva; Takamura, Yayoi (November 2022, Journal of Applied Physics)

   Magnetic properties and interfacial phenomena of epitaxial perovskite oxides depend sensitively on parameters such as film thickness and strain state. In this work, epitaxial La 0.67 Sr 0.33 CoO 3 (LSCO)/La 0.67 Sr 0.33 MnO 3 (LSMO) bilayers were grown on NdGaO 3 (NGO) and LaAlO 3 (LAO) substrates with a fixed LSMO thickness of 6 nm, and LSCO thickness (t LSCO ) varying from 2 to 10 nm. Soft x-ray magnetic spectroscopy revealed that magnetically active Co 2+ ions that strongly coupled to the LSMO layer were observed below a critical t LSCO for bilayers grown on both substrates. On LAO substrates, this critical thickness was 2 nm, above which the formation of Co 2+ ions was quickly suppressed leaving only a soft LSCO layer with mixed valence Co 3+ /Co 4+ ions. The magnetic properties of both LSCO and LSMO layers displayed strong t LSCO dependence. This critical t LSCO increased to 4 nm on NGO substrates, and the magnetic properties of only the LSCO layer displayed t LSCO dependence. A non-magnetic layer characterized by Co 3+ ions and with a thickness below 2 nm exists at the LSCO/substrate interface for both substrates. The results contribute to the understanding of interfacial exchange spring behavior needed for applications in next generation spintronic and magnetic memory devices. 

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4. Nickelate Superconductivity without Rare‐Earth Magnetism: (La,Sr)NiO ₂

   https://doi.org/10.1002/adma.202104083  

   Osada, Motoki; Wang, Bai_Yang; Goodge, Berit_H; Harvey, Shannon_P; Lee, Kyuho; Li, Danfeng; Kourkoutis, Lena_F; Hwang, Harold_Y (September 2021, Advanced Materials)

   Abstract The occurrence of unconventional superconductivity in cuprates has long motivated the search for manifestations in other layered transition metal oxides. Recently, superconductivity is found in infinite‐layer nickelate (Nd,Sr)NiO₂and (Pr,Sr)NiO₂thin films, formed by topotactic reduction from the perovskite precursor phase. A topic of much current interest is whether rare‐earth moments are essential for superconductivity in this system. In this study, it is found that with significant materials optimization, substantial portions of the La_1−xSr_xNiO₂phase diagram can enter the regime of coherent low‐temperature transport (x = 0.14 ‐ 0.20), with subsequent superconducting transitions and a maximum onset of ≈9 K atx = 0.20. Additionally, the unexpected indication of a superconducting ground state in undoped LaNiO₂is observed, which likely reflects the self‐doped nature of the electronic structure. Combining the results of (La/Pr/Nd)_1−xSr_xNiO₂reveals a generalized superconducting dome, characterized by systematic shifts in the unit cell volume and in the relative electron‐hole populations across the lanthanides. 

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5. Controlling Magnetization Vector Depth Profiles of La _0.7 Sr _0.3 CoO ₃ /La _0.7 Sr _0.3 MnO ₃ Exchange Spring Bilayers via Interface Reconstruction

   https://doi.org/10.1021/acsami.0c09417  

   Kane, Alexander M.; Chiu, I-Ting; Ahlm, Nolan J.; Chopdekar, Rajesh V.; N’Diaye, Alpha T.; Arenholz, Elke; Mehta, Apurva; Lauter, Valeria; Takamura, Yayoi (October 2020, ACS Applied Materials & Interfaces)

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