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
322 2023-10-04 16:00  E6-2, #2502  [High-Energy Theory Seminar] Moving towards quantum technologies: the case of quantum batteries
321 2023-05-03 16:00  E6-2, #2502  Probing microscopic origins of axions by the chiral magnetic effect
320 2023-09-26 16:00  E6-2, #2502  [High Energy Theory Seminar]A new step in interacting dark sector cosmologies
319 2023-06-14 16:00  E6-2, #2502  [High-Energy Theory Seminar]Vertex algebras and extended operators in 4d N=2 SCFTs
318 2023-06-16 13:00  E6-2, #2502  Quantum critical states under extreme conditions
317 2023-11-01 16:00  E6-2, #2502  [High Energy Theory Seminar] Modular functions and 3D N=4 rank-zero superconformal field theories
316 2023-08-29 16:00  E6-2, #2502  [High Energy Theory Seminar] Towards string loop corrections in Calabi-Yau orientifold compactifications.
315 2015-08-03 10:30  E6-2, #1323 (Seminar Room)  Axion Search
314 2024-01-16 14:00  E6-2, #1323  Dimer Physics and Superconductivity in La3Ni2O7
313 2024-01-03 11:00  E6-2, #1323  Interplay of Strong Correlations, Topology, and Disorder in 2D Quantum Matters
312 2022-09-15 13:00  E6-2, #1323  AdS black holes: a review
311 2023-06-08 16:00  E6-2, #1323  Thermal decoupling in high-Tc cuprate superconductors
310 2023-07-18 11:00  E6-2, #1323  Non-Hermitian Casimir Effect of Magnons
309 2023-07-12 11:00  E6-2, #1323  Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
308 2023-12-19 16:00  E6-2, #1323  [High Energy Theory Seminar] Non-invertible symmetries, leptons, quarks, and why multiple generations
307 2023-07-19 16:00  E6-2, #1323  [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
306 2023-07-11 11:00  E6-2, #1323  Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
305 2015-11-28 10:00  E6-2, #1323  Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
304 2015-11-19 16:00  E6-2, #1323  Emergent Collective Phenomena and Functions at Reduced Dimensions
303 2015-11-24 16:00  E6-2, #1323  Topology-based understanding of spin dynamics in inhomogeneously magnetized systems