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 |
|---|---|---|---|---|
| 202 | Jun 28, 14:00 | E6-2, #1322 | Dr. Bongjae Kim, Dr. Sooran Kim, Dr. Jeongwoon Hwang |
1st Research-exchange meeting of computational material physics
 |
| 201 | July 31(Wed.)/ 16:00 | E6-2, #1323 | Dr. Ivan Borzenets |
Features of ballistic superconducting graphene
|
| 200 | July 25(Thur.),4:00PM | E6-2, #1323 | Prof.Bohm-Jung Yang |
Band topology of twisted bilayer graphene
|
| 199 | Jun 24 (Mon) 11:00 | E6-2, #1323 | Dr. Henning Schomerus |
Topological photonic anomalies
|
| 198 | 2016/09/29-12/13 | E6-2, #1323 | Sangyoon Han 외 |
2016 Fall, Physics Seminar Serises
|
| 197 | 2016/1/26, 2PM | E6-2, #1323 | Dr. Sergei V. Kalinin (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory) | Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data |
| 196 | 2016/1/11, 4PM | E6-2, #1323 | Dr. B.J.Kim (Max Planck Institute for Solid State Research) | Mott Physics in the Strong Spin-Orbit Coupling Regime |
| 195 | 2015/12/11, 3:45PM | E6-2, #1323 | Dr. Ji Hun Sim (POSTECH) | Dynamical mean field theory studies on heavy fermion system |
| 194 | 2015/12/11, 1:30PM | E6-2, #1323 | Dr. KwangYong Choi (Chung-Ang University) | Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9 |
| 193 | 2015/12/09, 2PM | E6-2, #1323 | Arjun G. Yodh (University of Pennsylvania) | SWELLABLE COLLOIDAL PARTICLES ARE SWELL |
| 192 | 2015/12/03, 4PM | E6-2, #1323 | Dr. Sang-Yun Lee (3rd institute of Physics, University of Stuttgart, Germany) | Hybrid solid state spin qubits in wide bandgap semiconductors |
| 191 | 2015/12/02, 4PM | E6-2, #1323 | Dr. Dae-Jeong Kim (Dept. of Physics and Astronomy, University of California, Irvine) | Samarium Hexaboride: Is it a Topological insulator? |
| 190 | 2015/12/01, 4PM | E6-2, #1323 | Dr. Yeong Kwan Kim(Lawrence Berkeley National Laboratory, USA) | Introducing extra dimensions to spectroscopic studies of advanced quantum materials |
| 189 | 2015/11/28, 10AM | E6-2, #1323 | Dr. Suyong Jung (Korea Research Institute of Standards and Science) | Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier |
| 188 | 2015/11/23, 1:30PM | E6-2, #1323 | Dr. Michael Park (Stanford University) | What's Beyond the Standard Model? Lessons from Run I and what might come in Run II |
| 187 | 2015/11/19, 4PM | E6-2, #1323 | Dr. Daesu Lee (University of Wisconsin-Madison) | Emergent Collective Phenomena and Functions at Reduced Dimensions |
| 186 | 2015/11/24, 4PM | E6-2, #1323 | Dr. Kab-Jin Kim (Institute for Chemical Research, Kyoto University, Japan) | Topology-based understanding of spin dynamics in inhomogeneously magnetized systems |
| 185 | 2015/11/10, 4PM | E6-2, #1323 | Dr. Woosuk Bang (Physics division, Los Alamos National Laboratory) | Rapid heating of matter using high power lasers |
| 184 | 2015/08/03,10:30AM | E6-2, #1323 (Seminar Room) | Dr. Jonghee Yoo (Fermi National Accelerator Laboratory, USA ) | Axion Search |
| 183 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
|