More Like this

1. Controlling the anomalous Hall effect by electric-field-induced piezo-strain in Fe 40 Pt 60 /(001)-Pb(Mg 1/3 Nb 2/3 ) 0.67 Ti 0.33 O 3 multiferroic heterostructures

   https://doi.org/10.1063/1.5008591  

   Yang, Yuanjun ; Yao, Yingxue ; Chen, Lei ; Huang, Haoliang ; Zhang, Benjian ; Lin, Hui ; Luo, Zhenlin ; Gao, Chen ; Lu, Y. L. ; Li, Xiaoguang ; et al ( January 2018 , Applied Physics Letters)
2. 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. 

   more » « less
3. 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)
4. Crafting Spin-State Switchable Strain Profiles within Rb x Co[Fe(CN) 6 ] y @K j Ni[Cr(CN) 6 ] k Heterostructures

   https://doi.org/10.1021/acs.chemmater.0c03608  

   Cain, John M. ; Felts, Ashley C. ; Meisel, Mark W. ; Talham, Daniel R. ( January 2021 , Chemistry of Materials)

   null (Ed.)
5. Growth mode and strain effect on relaxor ferroelectric domains in epitaxial 0.67Pb(Mg 1/3 Nb 2/3 )O 3 –0.33PbTiO 3 /SrRuO 3 heterostructures

   https://doi.org/10.1039/D0RA10107A  

   Belhadi, Jamal ; Gabor, Urška ; Uršič, Hana ; Daneu, Nina ; Kim, Jieun ; Tian, Zishen ; Koster, Gertjan ; Martin, Lane W. ; Spreitzer, Matjaž ( January 2021 , RSC Advances)

   null (Ed.)

   Controlling the growth of complex relaxor ferroelectric thin films and understanding the relationship between biaxial strain–structural domain characteristics are desirable for designing materials with a high electromechanical response. For this purpose, epitaxial thin films free of extended defects and secondary phases are urgently needed. Here, we used optimized growth parameters and target compositions to obtain epitaxial (40–45 nm) 0.67Pb(Mg 1/3 Nb 2/3 )O 3 –0.33PbTiO 3 /(20 nm) SrRuO 3 (PMN–33PT/SRO) heterostructures using pulsed-laser deposition (PLD) on singly terminated SrTiO 3 (STO) and ReScO 3 (RSO) substrates with Re = Dy, Tb, Gd, Sm, and Nd. In situ reflection high-energy electron diffraction (RHEED) and high-resolution X-ray diffraction (HR-XRD) analysis confirmed high-quality and single-phase thin films with smooth 2D surfaces. High-resolution scanning transmission electron microscopy (HR-STEM) revealed sharp interfaces and homogeneous strain further confirming the epitaxial cube-on-cube growth mode of the PMN–33PT/SRO heterostructures. The combined XRD reciprocal space maps (RSMs) and piezoresponse force microscopy (PFM) analysis revealed that the domain structure of the PMN–33PT heterostructures is sensitive to the applied compressive strain. From the RSM patterns, an evolution from a butterfly-shaped diffraction pattern for mildly strained PMN–33PT layers, which is evidence of stabilization of relaxor domains, to disc-shaped diffraction patterns for high compressive strains with a highly distorted tetragonal structure, is observed. The PFM amplitude and phase of the PMN–33PT thin films confirmed the relaxor-like for a strain state below ∼1.13%, while for higher compressive strain (∼1.9%) the irregularly shaped and poled ferroelectric domains were observed. Interestingly, the PFM phase hysteresis loops of the PMN–33PT heterostructures grown on the SSO substrates (strain state of ∼0.8%) exhibited an enhanced coercive field which is about two times larger than that of the thin films grown on GSO and NSO substrates. The obtained results show that epitaxial strain engineering could serve as an effective approach for tailoring and enhancing the functional properties in relaxor ferroelectrics. 

   more » « less