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 |
---|---|---|---|---|
256 | May 29 (Tue.), 04:00 PM | #1323, E6-2 | Prof. Jae-Won Jang |
Investigation on metal nanostructure/semiconductor junction and its applications
![]() |
255 | Oct 23 (Fri.), 14:00 PM | E6-2 #1323 | Prof. Ivan Savenko (University of Science and Technology & IBS PCS) |
Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime
![]() |
254 | July 13, 2018 at 14:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Prof. Ian Lewis (The University of Kansas, Department of Physics & Astronomy) | Loop Induced Single Top Partner Production and Decay at the LHC |
253 | DEC. 11 (Tue), 04:00 PM | E6-2. 1st fl. #1323 | Prof. Hiroshi Shinaoka |
Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations
![]() |
252 | AUG. 31 (Thu.), 2 PM | #5318(E6-2. 5th fl.) | Prof. Hiroaki Ishizuka (The University of Tokyo) |
“Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals”
![]() |
251 | May 31 (Fri.), 11:00 AM | #1323, E6-2 | Prof. Guido Burkard |
Cavity QED with Spin Qubits
![]() |
250 | May 27,(Fri), 11:00 AM | Online seminar | Prof. Gray Rybka(University of Washington) |
Current Status and Future Plans of ADMX
![]() |
249 | 2015/07/23,1:30PM | E4, B401 | Prof. Gilles Lérondel (Univ. of Technology of Troyes) |
Enhanced ZnO based UV photonics and related applications
![]() |
248 | October 15, 2020 (Thursday | CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus | Prof. Gil-Ho Lee (POSTECH) |
Graphene-based Josephson junction microwave bolometer
![]() |
247 | June 3(Fri.) 11:00 | E6-2 #1323 | Prof. Gil Young Cho (Department of Physics, POSTECH) | (응집물리 세미나) Theoretical Investigation of Exotic Quantum States in Low-dimensional Materials |
246 | February 21 (Thu.), 16:00 PM | #5313, E6-2 | Prof. Diptimoy Ghosh |
B-meson charged current anomalies - Theoretical status
![]() |
245 | 2019/09/18 - 12/5 | Seminar Room #1323 | Prof. David Schuster and etc. |
Fall 2019: Physics Seminar Serises
![]() |
244 | 2016/03/07-06/13 | E6, 1501 | Prof. David Helfman(KAIST) 외 |
Physics Colloquium : 2016 Spring
![]() |
243 | 2015/03/04, 12PM | 1323호, E6-2 | Prof. Choi Hak-Soo(Harvard) |
Bioimaging and Biosensing Using Near-Infrared Fluorescence
![]() |
242 | May. 3 (Fri), 11:00 AM | E6-2. 2st fl. #2502 | Prof. Changhee Sohn |
Exotic Magnetism
![]() |
241 | 2014/12/22, 2PM | E6, Rm1319 | Prof. Changbong Hyeon (KIAS) |
Dynamics of molecular motors: Power stroke vs Brownian ratchet
![]() |
240 | May 30 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Chang-Hee Cho |
Tuning the excitonic properties of semiconductors with light-matter interactions
![]() |
239 | July 9 (Mon.), 14:00 PM | #1323, E6-2 | Prof. Cesar A. Hidalgo, MediaLab, MIT |
The principles of collective learning
![]() |
238 | Mar25(Thur), 04:00PM | Online Seminar (Zoom) | Prof. Atsushi Tokiyasu (Tohoku Univ.) |
Search for dark matter axion with Rydberg atoms
![]() |
237 | Aug. 4, 2016 (Thu.), 2:30 pm | KAIST Natural Science Building (E6-5), EDU 3.0 Room(1st fl.) | Prof. Argyris Nicolaidis | Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics) |