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)
414 2018-12-07 14:30    Spin generation from heat and light in metals file
413 2018-12-07 16:00    Novel probes of interacting electrons in 2D systems file
412 2018-12-11 16:00    Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations file
411 2018-12-16 16:00    Lectures on 2d Conformal Field Theory file
410 2018-12-26 16:00    Informal Workshop on Topology and Correlation file
409 2018-12-26 16:00    Brane-like defect in 3D toric code file
408 2018-12-27 16:00    Quantum Innovation (QuIN) Laboratory file
407 2019-01-07 15:00    Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
406 2019-01-09 16:00    Molecular Mott state in the deficient spinel GaV4S8 file
405 2019-01-23 16:00    Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors file
404 2019-02-21 16:00    B-meson charged current anomalies - Theoretical status file
403 2019-02-25 16:00    Spring 2019: Physics Colloquium file
402 2019-03-21 16:00    Spring 2019: Physics Seminar Serises file
401 2019-03-26 15:00    Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets file
400 2019-03-29 14:30    Epitaxial Multifunctional Oxide Thin Films for Novel Electronics file
399 2019-03-29 16:00    Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM file
398 2019-04-04 16:00    Chiral spin-photon interaction at nanoscale file
397 2019-04-11 16:00    Massive screening for cathode active materials using deep neural network file
396 2019-04-19 11:00    First-principles studies of semiconductors for solar cell applications file
395 2019-04-19 14:30    A family of finite-temperature electronic phase transitions in graphene multilayers file