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1. Polarization pinning at antiphase boundaries in multiferroic YbFeO ₃

   https://doi.org/10.1088/1674-1056/ad8cbc  

   Ren, Guodong; Omprakash, Pravan; Li, Xin; Yun, Yu; Thind, Arashdeep S; Xu, Xiaoshan; Mishra, Rohan (November 2024, Chinese Physics B)

   Abstract The switching characteristics of ferroelectrics and multiferroics are influenced by the interaction of topological defects with domain walls. We report on the pinning of polarization due to antiphase boundaries in thin films of the multiferroic hexagonal YbFeO₃. We have directly resolved the atomic structure of a sharp antiphase boundary (APB) in YbFeO₃thin films using a combination of aberration-corrected scanning transmission electron microscopy (STEM) and total energy calculations based on density-functional theory (DFT). We find the presence of a layer of FeO₆octahedra at the APB that bridges the adjacent domains. STEM imaging shows a reversal in the direction of polarization on moving across the APB, which DFT calculations confirm is structural in nature as the polarization reversal reduces the distortion of the FeO₆octahedral layer at the APB. Such APBs in hexagonal perovskites are expected to serve as domain-wall pinning sites and hinder ferroelectric switching of the domains. 

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2. Pinning Efficiency of One-Dimensional Artificial Pinning Centers in YBa ₂ Cu ₃ O _7-x Thin Films

   https://doi.org/10.1109/TASC.2019.2895739  

   Wu, Judy; Gautam, Bibek; Sebastian, Mary Ann; Ogunjimi, Victor; Misra, Shikhar; Huang, Jijie; Baca, Javier; Prestigiacomo, Joseph; Haugan, Timothy; Wang, Haiyan; et al (August 2019, IEEE Transactions on Applied Superconductivity)
3. Probing the effect of interface on vortex pinning efficiency of one-dimensional BaZrO ₃ and BaHfO ₃ artificial pinning centers in YBa ₂ Cu ₃ O _7-x thin films

   https://doi.org/10.1063/1.5050616  

   Gautam, Bibek; Sebastian, Mary Ann; Chen, Shihong; Misra, Shikhar; Huang, Jijie; Javier Baca, F.; Emergo, Rose; Haugan, Timothy; Xing, Zhongwen; Wang, Haiyan; et al (November 2018, Applied Physics Letters)
4. Achieving High and Isotropic Pinning in Multilayer BaZrO ₃ /YBa ₂ Cu ₃ O _7-x Films

   https://doi.org/10.1109/TASC.2026.3651418  

   Aafiya; Ogunjimi, Victor; Sebastian, Mary Ann; Panth, Mohan; Tsai, Benson; Chowdhury, Abhijeet; Huang, Jialong; Haugan, Timothy; Wang, Haiyan; Wu, Judy (August 2026, IEEE Transactions on Applied Superconductivity)
5. The effect of APC/YBCO interface on the angular range of effective pinning by one-dimensional artificial pinning centers in YBa ₂ Cu ₃ O _7-x nanocomposite films

   https://doi.org/10.1088/1757-899X/756/1/012025  

   Ogunjimi, V; Gautam, B; Sebastian, M.A.; Haugan, T; Wu, J (March 2020, IOP Conference Series: Materials Science and Engineering)