visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2021-05-14 14:30 
일시 May. 14 (Fri.), 02:30 PM 
장소 Online seminar 
연사 Dr. Suyong Jung(KRISS) 

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 장소 제목
542 2018-09-07 15:00  학술문화관 (E9), 2층 양승택 오디토리움  Recent developments in density functional theory: From new functionals to the nature of the chemical bond file
541 2016-05-17 11:00  창의학습관(E11), 406호  The CERN Resonant WISP Search: Development, Results and Lesson-Learned
540 2022-05-13 16:00  자연과학동(E6-2) 1st fl. #1323  High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
539 2021-11-02 16:00  자연과학동(E6-2) #1323  Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
538 2017-12-13 13:30  자연과학동 대형강의실 (1501호)  KAIST-KIAS Joint Workshop in Theoretical Sciences 개최 file
537 2021-05-27 16:00  온라인  찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
536 2018-08-01 11:00  양분순 빌딩 (E16-1) 207호  Future of AI: Is the brain a computer? file
535 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
534 2020-09-14 17:30  Zoom webinar  KAIST Global Forum for Spin and Beyond (Third Forum) file
533 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
532 2020-09-22 09:30  Zoom webinar  Physics and applications of soliton microcombs(Quantum- & Nano-Photonics) file
531 2021-06-08 10:00  Zoom webinar  Photonic crystal devices for sensing file
530 2020-08-17 20:00  Zoom webinar  Using magnetic tunnel junctions to compute like the brain file
529 2021-04-19 19:00  Zoom webinar  Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
528 2020-08-25 20:00  Zoom webinar  KAIST Global Forum for Spin and Beyond (Second Forum) file
527 2020-09-28 17:30  Zoom webinar  KAIST Global Forum for Spin and Beyond(Fourth Forum) file
526 2021-12-03 16:00  Zoom webinar  Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
525 2021-05-17 17:00  Zoom webinar  Spin current generation and detection in uniaxial antiferromagnets file
524 2021-12-03 14:30  Zoom webinar  Topological Spin Textures: Skyrmions and Beyond file
523 2021-04-09 10:00  Zoom webinar  Integrated Lithium Niobate Photonics file