Article
Chemistry, Multidisciplinary
Laura Guasco, Yury Khaydukov, Gideok Kim, Thomas Keller, Alexei Vorobiev, Anton Devishvili, Peter Wochner, Georg Christiani, Gennady Logvenov, Bernhard Keimer
Summary: This study reports a new type of device with adjustable magnetic noncollinearity. By modulating the La1-xSrxMnO3 material, highly noncollinear magnetic structures with a periodicity twice as large as the unit cell were achieved. The magnetic structure can be effectively adjusted by low magnetic fields, suggesting oxide homojunctions as a promising platform for tunable complex magnetism and spintronic device design.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Pinku Roy, Di Zhang, Alessandro R. Mazza, Nicholas Cucciniello, Sundar Kunwar, Hao Zeng, Aiping Chen, Quanxi Jia
Summary: Topologically protected non-trivial spin textures give rise to novel phenomena, such as the topological Hall effect. This study investigates the Hall effect in SrRuO3/La0.42Ca0.58MnO3 bilayers and finds that the proximity effect of LCMO plays a critical role. The reduction in SRO thickness enhances THE-like features.
Article
Materials Science, Multidisciplinary
Guowei Zhou, Jiarui Dou, Huihui Ji, Zhi Yan, Penghua Kang, Zhilan Li, Yufan Shen, Siqi Wang, Xiaohong Xu
Summary: In this work, manganite superlattices consisting of a ferromagnetic La0.7Sr0.3MnO3 (LSMO) metal and a G-type antiferromagnetic SrMnO3 (SMO) insulator were investigated. Two intriguing phenomena were observed: the coexistence of exchange bias and vertical magnetization shift in thicker superlattices, and the variation of magnetic anisotropy from planar to perpendicular with increasing SMO layer thickness. These phenomena were confirmed by electric transport anisotropy measurements and microscopic magnetic domain switching images. Importantly, a new method for manipulating vertical magnetization shift and magnetic anisotropy was developed, enabling the control of magnetic properties and the discovery of emergent phenomena.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Evgenii Sterkhov, Nikolay M. Chtchelkatchev, Elena Mostovshchikova, Roman E. Ryltsev, Sergey A. Uporov, Gheorghe L. Pascut, Andrey Fetisov, Svetlana G. Titova
Summary: PrBaMn2O6 with ordered alternate stacking of PrMnO3/BaMnO3 layers exhibits two magnetic phase transitions close to room temperature, making it a promising magnetocaloric and magnetoresistive material. The experimentally detected structural transition is attributed to the splitting of eg-doublet states due to the tendency towards orbital ordering at the metal-insulator phase transition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Dinesh Chintha, Shivanand Kumar Veesam, Emanuele Boattini, Laura Filion, Sudeep N. Punnathanam
Summary: The article presents a method to model the two-body and three-body PMF between ligand coated nanoparticles through a linear combination of symmetry functions. The method is quite general and can be extended to model interactions between different types of macromolecules.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Aaron Michelson, Brian Minevich, Hamed Emamy, Xiaojing Huang, Yong S. Chu, Hanfei Yan, Oleg Gang
Summary: Advances in nanoscale self-assembly techniques have allowed for the creation of complex nanostructures. However, accurately imaging these structures in three dimensions at the single-component level with elemental sensitivity has been a challenge. In this study, we present a nondestructive three-dimensional imaging technique using nano-focused hard x-rays, DNA-programmable nanoparticle assembly, and nanoscale inorganic templating. With this technique, we were able to determine the positions of individual nanoparticles and identify the arrangements of assembly motifs in a three-dimensional lattice, as well as observe the resulting multimaterial framework with elemental sensitivity.
Article
Physics, Condensed Matter
Zhenzhen Wang, Qichang An, Meng Meng, Wenhua Xue, Jiachang Bi, Yanwei Cao, Yumei Wang, Xiaoran Liu, Fang Yang, Jiandong Guo
Summary: It has been found that artificially ordered (111)-oriented [(SrMnO3)(1)/(LaMnO3)(2)](n) superlattices with respect to the compositionally equivalent La2/3Sr1/3MnO3 films with a random distribution of A-site dopants have similar ferromagnetism and electrical transport properties. However, the superlattices have a tendency to preserve oxygen vacancies inside, making them more difficult to be compensated by the post-annealing process.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Physics, Condensed Matter
Y. Ounza, R. Moubah, M. Oubla, A. Elouafi, M. Moutatouia, M. Lamire, E. K. Hlil, H. Lassri
Summary: An investigation was conducted on the electrical behavior of the double-layered perovskite LaCa-BiMn2O7 at various temperatures and magnetic fields, revealing a metal-insulator transition and a strong magnetoresistance effect. The relationship between transport properties and magnetic behavior was analyzed using a mathematical model, predicting the magnetic entropy change.
SOLID STATE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
W. Mabrouki, A. Krichene, N. Chniba Boudjada, W. Boujelben
Summary: This paper presents a theoretical description of the magnetocaloric effect in Pr0.67Sr0.33MnO3 manganite. The mean-field theory is used to simulate the temperature dependence of the magnetic entropy change under several applied magnetic fields around the Curie temperature. The results obtained from the mean-field theory are compared with experimental data, and the excellent agreement between the two methods suggests the validity of the theory for modeling the magnetocaloric properties of the manganite. The study also indicates that the sample can be used as a magnetic refrigerant near room temperature.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Pierre A. Pantaleon, Tommaso Cea, Rory Brown, Niels R. Walet, Francisco Guinea
Summary: The study investigates the electronic band structures in different arrangements of graphene layers, finding narrow bands with different topology in all cases, and the strong modification of band structures by long range Coulomb interactions.
Article
Energy & Fuels
Sang-Woo Jeon, Heeil Yoo, Se Youn Moon, Tae-Hwan Kim
Summary: This study investigates the collective self-assembly of boron nitride nanotubes (BNNTs) using block copolymers as a template and examines the BNNT-induced phase behavior of the block copolymer. The encapsulation of BNNTs by in situ polymerization of surfactants and the resulting overall structures were confirmed by small-angle neutron scattering and atomic force microscopy. The self-assembly of two-dimensional hexagonal structures of BNNTs in the block copolymer matrix upon heating offers potential applications as effective piezoelectric materials for energy harvesting. Moreover, the addition of BNNTs allows for the controlled phase behavior of the block copolymer, leading to different structures depending on the BNNT concentration and temperature.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Xun Hu, Baiyi Chen, Changfeng Huang, Hongwei Qiu, Na Gao, Yaping Wu, Duanjun Cai, Kai Huang, Junyong Kang, Rong Zhang
Summary: We achieved remarkably enhanced responsivity in metal-semiconductor-metal photodetectors by embedding highly uniform rhodium nanoparticle arrays with large-scale periodicity through localized surface plasmon resonance. Theoretical simulations and experimental results confirmed the improved performance, with a reduced dark current, a shifted maximum responsivity wavelength, and a highly increased enhancement ratio at a specific wavelength. This study contributes significantly to the literature by presenting a novel approach to enhance the performance of AlGaN-based photodetectors in the UV region using a large-scale distributed rhodium nanoparticle array.
Article
Chemistry, Multidisciplinary
Qingda Liu, Qinghua Zhang, Wenxiong Shi, Hanshi Hu, Jing Zhuang, Xun Wang
Summary: The assembly of polyoxometalate clusters into layered structures, referred to as clusterphenes, has been reported. These 2D structures exhibit uniform hexagonal pores and in-plane electron delocalization properties. The resulting clusterphenes show improved stability and catalytic efficiency, thanks to the electron delocalization within the 2D layer.
Article
Optics
Humaira Zafar, Bruna Paredes, Juan Villegas, Mahmoud Rasras, Mauro Fernandes Pereira
Summary: An efficient, dual-polarization silicon waveguide array with low insertion losses and negligible crosstalks for both TE and TM polarizations has been reported using S-shaped adiabatically bent waveguides.
Article
Chemistry, Multidisciplinary
Helen Ibrahim, Victor Baledent, Marianne Imperor-Clerc, Brigitte Pansu
Summary: We report on the high pressure small angle X-ray scattering measurements on 3D face-centered cubic supracrystals built from spherical gold nanoparticles. The supracrystals showed high structural stability under hydrostatic pressure. The compression of the supracrystals involves collapse of the voids between the nanoparticles and compression of the soft matrix, which is less compressible than crystalline dodecane due to constrained chain packing within the soft matrix.
