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)
454 2018-05-17 13:30    Quantum Spin Liquid in Kitaev Materials file
453 2018-05-29 16:00    Investigation on metal nanostructure/semiconductor junction and its applications file
452 2018-05-31 16:00    Dynamic control of optical properties with gated-graphene metamaterials file
451 2018-06-01 11:00    Topological phases in low-dimensional quantum materials file
450 2018-06-14 10:00    Phonons and polariton-like particles in trapped ions for quantum computation and quantum simulation file
449 2018-06-18 10:00    Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms file
448 2018-06-22 10:00    Success in Research Career file
447 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
446 2018-07-02 15:00    High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
445 2018-07-09 14:00    The principles of collective learning file
444 2018-07-12 17:00    The MilliQan Experiment: Search for Milli-Charged Particles at the LHC
443 2018-07-13 14:00    Loop Induced Single Top Partner Production and Decay at the LHC
442 2018-07-26 14:00    Inflation in String Theory and Backreaction file
441 2018-07-27 13:30    Magnetic reversal of artificial spin ice file
440 2018-07-27 15:00    Muon g-2 in the 2HDM and MSSM: comprehensive numerical analysis and absolute maxima file
439 2018-08-01 11:00    Future of AI: Is the brain a computer? file
438 2018-09-04 14:30    Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses file
437 2018-09-05 16:00    Shining a light on fractional excitations file
436 2018-09-07 15:00    Recent developments in density functional theory: From new functionals to the nature of the chemical bond file
435 2018-09-20 16:00    Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file