interfacial charge
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2022 ◽  
Vol 13 ◽  
pp. 100116
Author(s):  
Rajesh Sahu ◽  
Tarun Patodia ◽  
Dinesh Yadav ◽  
S.K. Jain ◽  
Balram Tripathi

Author(s):  
Xiaoyu Zhang ◽  
Ya-jun Tao ◽  
Pei-jie Jiao ◽  
Jian Wang ◽  
Ji Zhang ◽  
...  

Abstract Ferromagnetic insulators have received widespread attention for applications in novel low power consumption spintronic devices. Further optimizing the robust ferromagnetic insulating and developing multifunctional ferromagnetic insulator by integrating other magnetic property can not only ease or pave the way for actual application, but also provide an additional freedom degree for device designing. In this work, by introducing antiferromagnetic CoO into ferromagnetic insulator LaMnO3, we have constructed (1-x)LaMnO3:xCoO composite thin films. The films simultaneously show robust ferromagnetic insulator characteristics and large exchange bias. For x = 0.5 sample, the resistivity is 120 Ω·cm at 250 K while the magnetization is 100 emu/cm3 and the exchange bias field is -2200 Oe at 10 K. Especially, the blocking temperature is up to 140 K. Synchrotron radiation x-ray absorption spectroscopy reveals the coexistence of Mn3+, Mn2+, Co2+ and Co3+, arising from interfacial charge transfer and space charge/defect trapping, should be responsible for the enhanced and integrated multifunctional magnetic properties.


Author(s):  
I. C. Lin ◽  
M. H. Lee ◽  
P. C. Wu ◽  
S. C. Lin ◽  
J. W. Chen ◽  
...  

Abstract Thin oxide films are of vast opportunities for modern electronics and can facilitate emergent phenomena by factors absent in the bulk counterparts, such as the ubiquitous epitaxial strain and interfacial charge doping. Here, we demonstrate the twisting of intended bulk-metallic phases in 10-unit-cell LaNiO3, PrNiO3, and NdNiO3 films on (001)-oriented SrTiO3 into distinct charge-lattice entangled states by epitaxial strains. Using atomically-resolved electron microscopy and spectroscopy, the interfacial electron doping into SrTiO3 in the conventional context of band alignments are discounted. Instead, spontaneously doped holes that are localized and at the order of 1013 cm-2 are atomically unraveled across all three heterointerfaces and associated with strain mitigations by the accompanied atomic intermixing with various ionic radii. The epitaxial strains also lead to condensations of monoclinic-C2/c lattice instabilities, which are hidden to the bulk phase diagram. The group-theoretical analysis of characteristic transition pathways unveils the strain resurrection of the hidden C2/c symmetry. While this strain-induced monoclinic phase in LaNiO3 remains metallic at room temperature, those in PrNiO3 and NdNiO3 turn out to be insulating. Such strain-induced monoclinic lattice instabilities and parasitic localized holes go beyond the classical elastic deformations of films upon epitaxial strains and hint on plausible hidden orders in versatile oxide heterostructures with unexpected properties, of which the exploration is only at the infancy and full of potentials.


2022 ◽  
pp. 541-549
Author(s):  
Aaron J. Kaufman ◽  
Raina A. Krivina ◽  
Meikun Shen ◽  
Shannon W. Boettcher

Author(s):  
Zhi Xie ◽  
Qiaoling Li ◽  
Xingkai Peng ◽  
Xuewei Wang ◽  
Lingli Guo ◽  
...  

High efficiency and durability are two key targets for developing electrochemical catalysts for oxygen reduction reaction (ORR). Here, B/N co-doping porous carbon shell encapsulated Fe2N nanoparticles (NPs) was synthesized as...


2022 ◽  
Author(s):  
Pritam Kumar Panda ◽  
Deobrat Singh ◽  
Mateus Henrique Köhler ◽  
Douglas Duarte de Vargas ◽  
Zhong Lin Wang ◽  
...  

Contact Electrification (Triboelectrification) has been a long-standing phenomenon for 2600 years. The scientific understanding of contact electrification (triboelectrification) remains un-unified as the term itself implies complex phenomena involving mechanical contact/sliding...


Author(s):  
Cailiang Yue ◽  
Chang-Qing Zhu ◽  
Wenting Zheng ◽  
Jinli Qiu ◽  
Zhiling Du ◽  
...  

High-efficient mineralization of refractory organic pollutants is an admittedly difficult problem for most photocatalytic processes. Herein, a hierarchical type-II heterojunction of Bi2MoO6/Bi/BiOBr-x (BMO/Bi/BOB-x) was successfully fabricated via one-pot solvothermal method....


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