Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions
2021.05.10 14:10
장소 | Online seminar |
---|---|
일시 | May. 14 (Fri.), 02:30 PM |
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
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
196 | August. 1st (Thu), 14:00 | E6 Room(#1323) | Hyeok Yoon |
Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy
![]() |
195 | August 27 (Tue.), 4:00PM | Rm. 1323, E6 | Hiroshi Eisaki |
Critical current properties of Fe-based superconductors
![]() |
194 | January 17 (Fri), 4:00 PM | #1323, E6-2 | Hiroki Ikegami |
Symmetry Breaking and Topology in Superfluid 3He
![]() |
193 | September 26 (Thu.), 16:00 PM | #1323, E6-2 | Han Seb Moon |
Entanglement Swapping with Autonomous Polarization-Entangled Photon-Pairs from Warm Atomic Ensemble
![]() |
192 | December 27(Fri.), 15:00 | E6-2,#5318 | Han Gyeol Suh |
The superconducting order parameter puzzle of Sr2RuO4
![]() |
191 | Dec 27 (Fri), 3:00 PM | #5318, E6-2 | Han Gyeol Suh |
The superconducting order parameter puzzle of Sr2RuO4
![]() |
190 | May. 12(Thu), 4pm | E6-2. #1323 & Zoom | Dr.Philip Chang (University of California San Diego, Department of Physics) | New frontiers of electroweak physics at the LHC |
189 | May. 19(Thu), 4pm | E6-2. #1323 & Zoom | Dr.Jay Hyun Jo (Yale University, Department of Physics) | Chasing Long Standing Neutrino Anomalies with MicroBooNE |
188 | May. 18(Wed), 4pm | E6-2. #1323 & Zoom | Dr.Heeyeon Kim (Rutgers University, Department of Physics and Astronomy) | Geometry, Algebra, and Quantum Field Theory |
187 | Nov. 18th (Fri) 10:30 a.m. | #5318(5th fl.) | Dr. 최 순 원, Havard University | Non-equilibrium many-body spin dynamics in diamond |
186 | Oct. 27th(Thu) 4PM | #1323(E6-2) | Dr. 이 강 희, KAIST, Mechnical Engineering | Terahertz Metal Optics |
185 | June 28 (Fri.), 13:30 PM | #1323, E6-2 | Dr. Yusuke Kozuka |
Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures
![]() |
184 | Apr. 08 (Fri.), 13:30 PM | E6-2. 1st fl. #1501 | Dr. Yunkyu Bang, Chonnam National Univ. | Theoretical Overview of Iron-based superconductors and its future |
183 | Sep. 26 (Tue.), 11AM | #1323 (E6-2. 1st fl.) | Dr. Yukiaki Ishida / ISSP, University of Tokyo | Time-resolved ARPES study of Dirac and topological materials |
182 | Nov. 1 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWook Kim |
Squeezing the best out of 2D materials
![]() |
181 | Apr. 19 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWoo Nam |
A family of finite-temperature electronic phase transitions in graphene multilayers
![]() |
180 | 2015/11/06, 4:30 PM | E6-2, #5318 | Dr. Youngkuk Kim (University of Pennsylvania) | Topological Dirac line nodes in centrosymmetric semimetals |
179 | Mar. 16 (Fri.), 04:0 PM | E6-2. 1st fl. #1323 | Dr. YoungDuck Kim |
Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics
![]() |
178 | May 13 (Fri.), 1:30 PM | E6. #1501(1st fl.) | Dr. Young-Woo Son, Dept. of Physics, KIAS | Aperiodic crystals in low dimensions |
177 | April 11 (Wed), 4:00pm | #1323 (E6-2, 1st fl.) | Dr. Young-Sik Ra |
Non-Gaussian states of multimode light generated via hybrid quantum information processing
![]() |