visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2021-05-14 14:30 
연사  
장소 Online seminar 

SRC Seminar

 

 

Electrically tunable spin valve effect in vertical

van-der-Waals

magnetic tunnel junctions

 

Dr. Suyong Jung

Interdisciplinary Materials Measurement Institute, KRISS

 

May. 14 (Fri.), 02:30 PM

Online seminar

https://kaist.zoom.us/j/87512814606
회의 ID: 875 1281 4606
암호: 816956

 

Abstract:

Magnetic tunnel junctions (MTJ) and ensuing spin-valve operations employing high and low magnetoresistance (MR) states have laid the foundations for many of commercial spintronic applications. Coping with the already established

field, it is highly desirable to extend the conventional MTJ spin-valve functionality with an easily accessible device

parameter. Here, we report experimental realizations of bias-voltage controlled MTJ spin-valve operations, in which

high and low tunneling MR states can be selected without reconfiguring ferromagnet polarizations. Our vertical MTJs are prepared through all van der Waals (vdW)-coupled 2D–2D assemblies with Fe3GeTe2 (FGT) as spin-supplying

and detecting ferromagnetic electrodes, and a semiconducting WSe2 as an electrically and physically stable tunnel

barrier. We observe clear spin-valve characteristics with MR-switching ratios as high as ~ 110%. Quite interestingly,

the high- and the low-MR states become reversed when a tunneling-bias voltage varies, and resulting negative MR

switchings become as low as ~ – 40%. Based on density functional theory and quantum transport simulations, we

verify that the bias-voltage induced spin-valve operations are directly attributed to the spin-polarized electronic

structures, in particular, the concomitant contributions from the spin-polarized itinerant electrons and the localized

spin states in the 2D metallic ferromagnet, FGT.

 

Contact: SunYoung Choi, (sun.0@kaist.ac.kr)

Center for Quantum Coherence in Condensed Matter, KAIST

번호 날짜 연사 제목
256 2021-03-25 16:00    Search for dark matter axion with Rydberg atoms file
255 2021-04-02 14:30    Quantum computing and entanglement generation using trapped ions and photons
254 2021-04-02 16:00    Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy
253 2021-04-09 10:00    Integrated Lithium Niobate Photonics file
252 2021-04-19 19:00    Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
» 2021-05-14 14:30    Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions file
250 2021-05-14 16:00    Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
249 2021-05-17 17:00    Spin current generation and detection in uniaxial antiferromagnets file
248 2021-05-27 16:00    찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
247 2021-06-08 10:00    Photonic crystal devices for sensing file
246 2021-06-11 14:30    Engineering sound waves and vibrations in multi-mode nanomechanical systems file
245 2021-06-11 16:00    Pseudogap in surface-doped black phosphorus file
244 2021-06-22 17:00    Spintronics meets Quantum Materials file
243 2021-07-29 14:00    Gravitationally Induced Dark Sector and Inflationary Dynamics file
242 2021-11-02 16:00    Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
241 2021-12-03 14:30    Topological Spin Textures: Skyrmions and Beyond file
240 2021-12-03 16:00    Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
239 2022-01-11 15:00    Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
238 2022-01-12 11:00    Spectroscopic study of trapped ions towards probing dark matter and new physics file
237 2022-01-17 14:00    Five Lectures on Observational Probes of Dark Energy file