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
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
445 2016-03-11 13:30    Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
444 2018-11-01 16:00    Direct holography from a single snapshot file
443 2022-08-18 10:00    Disorder-driven phase transition in the second-order non-Hermitian skin effect
442 2023-04-27 11:00    Inverse Shapiro steps and coherent quantum phase slip in superconducting nanowires
441 2015-07-16 16:00    Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
440 2018-10-26 16:00    Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
439 2017-03-24 14:30    Topological Dynamics
438 2015-10-15 10:00    Development of Large-Bore, High Field Magnets at the NHMFL
437 2023-06-22 16:00    [CAPP Seminar] The muon g-2 puzzle file
436 2016-05-19 15:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
435 2016-07-08 11:00    Isostatic magnetism
434 2015-11-23 13:30    What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
433 2017-02-01 14:00    Quantum electron optics using flying electrons
432 2019-09-10 15:00    Two-Stage Kondo Effect file
431 2017-11-03 14:30    Quantum Resistor-Capacitor Circuit with Majorana Edge States file
430 2019-07-30 16:00    Dirac fermions and flat bands in correlated kagome metals file
429 2023-07-11 11:00    Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
428 2017-04-28 16:00    Carbon nanotubes coupled to superconducting impedance matching circuits
427 2016-09-29 16:00    Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
426 2019-06-12 15:00    The relation between free and interacting fermionic SPT phases file