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 |
---|---|---|---|---|
147 | Mar. 16 (Fri.), 04:0 PM | E6-2. 1st fl. #1323 | Dr. YoungDuck Kim |
Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics
![]() |
146 | Mar. 24 (Fri.), 2:30 PM | #1323 (1st fl. E6-2). | Dr. MahnSoo Choi | Topological Dynamics |
145 | Mar. 24 (Fri.), 4:00 PM | #1323 (1st fl. E6-2) | Dr. SangWook Lee | Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties |
144 | Mar. 25(Fri.) 11:00 | E6-1 #1323 | Prof. Ara Go (Department of Physics, Chonnam National University) |
(응집물리 세미나) Hund's metallicity in ruthenate systems
![]() |
143 | MAR. 26 (TUE), 0300 PM | E6-2. 2st fl. #2501 | Prof. Jung Hoon Han |
Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets
![]() |
142 | Mar. 29 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Seung Hyub Baek |
Epitaxial Multifunctional Oxide Thin Films for Novel Electronics
![]() |
141 | Mar. 29 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Taeyoung Choi |
Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM
![]() |
140 | Mar. 2nd (Thu), 4:00 p.m | #1323(E6-2. 1st fl.) | Dr. Jonathan Denlinger, Lawrence Berkeley National Lab | “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems” |
139 | Mar25(Thur), 04:00PM | Online Seminar (Zoom) | Prof. Atsushi Tokiyasu (Tohoku Univ.) |
Search for dark matter axion with Rydberg atoms
![]() |
138 | March 18(Fri.) 11:00 | Online seminar | Dr. Dirk Wulferding (IBS-Center for Correlated Electron Systems, Seoul National University, Seoul) |
(응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids
![]() |
137 | May 20(Fri.) 11:00 | E6-1 #1323 | Prof. Kwanpyo Kim (Department of Physics, Yonsei University) | (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals |
136 | May 1 (Wed), 4:00 PM | #1323, E6-2 | Dr. Sungkyun Choi |
Raman and x-ray scattering study on correlated electron systems: two case examples
![]() |
135 | May 11 (Wed.), 4 PM | E6-2. #1323(1st fl.) | Dr. Bumjoon Kim, Max Planck Institute for Solid State Research | The quest for novel high-temperature superconductors---Prospects and progress in iridates |
134 | May 13 (Fri.) 4 PM | E6. #1501(1st fl.) | Dr. Hosub Jin, Dept. of Physics, UNIST | Graphene analogue in (111)- BaBiO3 bilayer heterostructures for topological electronics |
133 | May 13 (Fri.), 1:30 PM | E6. #1501(1st fl.) | Dr. Young-Woo Son, Dept. of Physics, KIAS | Aperiodic crystals in low dimensions |
132 | May 16, 2016 (Mon) 4PM | #1323(E6-2, 1st Fl.) | Dr. Daniel Bowring , Fermi National Accelerator Laboratory | Tuning microwave cavities with biased nonlinear dielectrics for axion searches |
131 | May 19 (Thu) 4PM | #1323(E6-2, 1st fl.) | Dr. Heedeuk Shin, POSTECH | Nonlinear/quantum optical effect in silicon nano-photonics |
130 | May 19, 2016 (Thur.) 3PM | May 19, 2016 (Thur.) 3PM, | Dr. Michael Betz, CERN | The CERN Resonant WISP Search: Development, Results and Lesson-Learned |
129 | May 2 (Thu.), 4:00 PM | #1323, E6-2 | Prof. Joon Ik Jang |
Anomalous optical properties of halide perovskites
![]() |
128 | May 21 (Tue.), 4:00 PM | #5318, E6-2 | 임준원 박사 |
Classification of flat bands according to the band-crossing singularity of Bloch wave functions
![]() |