Tongjin Chen

ORCID: 0000-0003-0445-2170
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About
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Research Areas
  • Ferroelectric and Piezoelectric Materials
  • Neural dynamics and brain function
  • Advanced Memory and Neural Computing
  • Thermal Expansion and Ionic Conductivity
  • Multiferroics and related materials
  • Acoustic Wave Resonator Technologies
  • Photoreceptor and optogenetics research
  • Perovskite Materials and Applications
  • Magnetic and transport properties of perovskites and related materials
  • 2D Materials and Applications
  • Aluminum Alloys Composites Properties
  • Magnetic properties of thin films
  • Spectroscopy and Quantum Chemical Studies
  • Mechanical and Optical Resonators
  • MXene and MAX Phase Materials
  • stochastic dynamics and bifurcation
  • Graphene research and applications
  • Physics of Superconductivity and Magnetism
  • Quantum and electron transport phenomena
  • Advanced Welding Techniques Analysis
  • Transition Metal Oxide Nanomaterials

Tsinghua University
2019-2024

This research aims to overcome the tradeoff between bandwidth, temperature stability of frequency, and loss in surface acoustic wave filters. A novel multilayered structure, SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /Cu-grating/ <inline-formula xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$15^{\circ }~{Y}$ </tex-math></inline-formula> - notation="LaTeX">${X}$ LiNbO...

10.1109/led.2022.3185003 article EN IEEE Electron Device Letters 2022-06-21

Abstract Ferromagnetic semiconductors discovered in 2D materials open an avenue for highly integrated and multifunctional spintronics. The Curie temperature ( T C ) of existing ferromagnetic is extremely low the modulation effect their magnetism limited compared with metallic counterparts. interfacial found to effectively manipulate 3D magnetism, providing a unique opportunity tailoring magnetism. Here, it demonstrated that semiconductor Cr 2 Ge Te 6 (CGT) can be enhanced by 130% (from ≈65 K...

10.1002/adfm.202108953 article EN Advanced Functional Materials 2021-11-12

The anomalous Nernst effect (ANE), the generation of a transverse electric voltage by longitudinal temperature gradient, has attracted increasing interest from researchers recently, due to its potential in thermoelectric power conversion and close relevance Berry curvature band structure. Avoiding stray field ferromagnets, ANE antiferromagnets (AFMs) advantage realizing highly efficient densely integrated thermopiles. Here, we report observation an antiperovskite noncollinear AFM,...

10.1103/physrevapplied.18.024007 article EN Physical Review Applied 2022-08-02

High interfacial transparency is vital to achieve efficient spin-charge conversion for ideal spintronic devices with low energy consumption. However, in traditional ferromagnetic/nonmagnetic heterojunctions, the Rashba spin-orbit coupling brings about spin memory loss (SML) and two-magnon scattering (TMS), quenching current crossing heterointerfaces. To address intrinsic deficiency of heterointerface, we design a ferromagnetic FeRh/antiferromagnetic FeRh homojunction conversion, verified by...

10.1126/sciadv.abq2742 article EN cc-by-nc Science Advances 2022-09-21

One of the important steps for realizing artificial intelligence is identifying elementary units that are beneficial neural network construction. A type memristive behavior in which phase-change nanoclusters nucleate adaptively two adjacent dielectric layers with distinct distribution patterns demonstrated. This system responds potentiation to increased stimulation strength and fire action potential after threshold stimulation. Reversible nucleation confirmed both situ ex examinations using...

10.1002/smll.202105070 article EN Small 2022-01-20

To simulate a topological neural network handling weak signals via stochastic resonance (SR), it is necessary to introduce an inherent nonlinearity into nanoscale devices. We use the self-assembly method successfully fabricate phase-change quantum-dot string (PCQDS) crossing Pd/Nb:AlNO/AlNO/Nb:AlNO/Pd multilayer. The of phase change couples with electron tunneling so that PCQDS responds long signal sequence in modulated output style, which pulse pattern evolves enveloped by two sets periodic...

10.1021/acs.nanolett.4c01786 article EN Nano Letters 2024-06-20

Abstract Research and development of memristor‐based neuromorphic networks has entered the stage large‐scale application. However, understanding adopted memristors is still vague, meaning a thorough study their local activity urgently necessary. Here, an electrode tip created to focus electrical field on active locality, where NbO quantum dot (QD) self‐assembles in middle Nb‐doped AlNO film. The QD size can fluctuate under appropriately controlled electron beam or field, suggesting...

10.1002/qute.202300021 article EN Advanced Quantum Technologies 2023-04-14

Anomalous Nernst effect (ANE), the generation of a transverse electric voltage by longitudinal temperature gradient, has attracted increasing interests researchers recently, due to its potential in thermoelectric power conversion and close relevance Berry curvature band structure. Avoiding stray field ferromagnets, ANE antiferromagnets (AFM) advantage realizing highly efficient densely integrated thermopiles. Here, we report observation an antiperovskite noncollinear AFM Mn3SnN...

10.48550/arxiv.2201.05457 preprint EN cc-by-nc-sa arXiv (Cornell University) 2022-01-01
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