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
230 2021-04-02 14:30    Quantum computing and entanglement generation using trapped ions and photons
» 2021-05-14 14:30    Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions file
228 2015-11-28 10:00    Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
227 2022-05-11 16:00    Gravity as a phenomenon in quantum dynamics
226 2022-05-25 16:00    Uncovering New Lampposts for Dark Matter: Continuum or Conformal
225 2019-05-01 16:00    Raman and x-ray scattering study on correlated electron systems: two case examples file
224 2018-04-13 10:00    Quantum meets Mechanics: from Quantum Information to Fundamental Research file
223 2022-09-30 14:30    Putting a spin on the Josephson effect file
222 2022-07-14 15:00    Pure two-dimensional quantum electron liquid and its phase transition
221 2017-11-03 16:00    Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions file
220 2016-11-29 16:00    Symmetry Protected Kondo Metals and Their Phase Transitions
219 2022-10-26 10:00    Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
218 2016-10-07 13:30    “Symmetry and topology in transition metal dichalcogenide?”
217 2022-11-24 16:00    Probing fundamental physics by mapping the mm and sub-mm sky
216 2023-09-18 16:00    [CAPP Seminar] Searching for axions in quantum vacuum birefringence file
215 2019-04-26 16:00    Robust Quantum Metrology using Strongly Interacting Spin Ensembles and Quantum Convolutional Neural Network file
214 2021-12-03 14:30    Topological Spin Textures: Skyrmions and Beyond file
213 2019-11-05 16:00    Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
212 2019-11-20 16:00    Correlation between superconducting transition temperature and critical current density in irradiated iron-based superconductors file
211 2020-02-13 16:30    Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file