장소 | E6-2. #1323(1st fl.) |
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일시 | Nov. 04 (Fri), 1:30 PM |
연사 | Dr. Jonghyun Song, Department of Physics, Chungnam National University |
Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications
Nov. 04 (Fri), 1:30 PM
E6-2. #1323(1st fl.)
Dr. Jonghyun Song, Department of Physics, Chungnam National University
Abstract:
great attentions. Here we report the fabrication of spintronics devices based upon the interface ferromagnetism of LaAlO3/SrTiO3 (LAO/STO) heterostructures. The choice of the LAO/STO structure was inspired by its high-mobility two-dimensional electron gas and a number of experimental investigations revealing the spin ordering at this oxide interface. However, the possibility and mechanisms of this interfacial magnetism are still debated and the spin degree of freedom has not yet been employed adequately. The spin injection in the device in this study is enabled by an appropriately thin epitaxial Ti interlayer. Tunnelling magnetoresistance (TMR) is observed and shows such a strong in-plane anisotropy that the sign changes with the direction of applied magnetic field. This may be due to the strong Rashba-type spin-orbit coupling and the tetragonal domain configuration in the LAO/STO heterointerface. These new findings provide evidence of the interface ferromagnetism of the LAO/STO system, open up possible applications of the spin degree of freedom in the oxide heterointerfaces, and give insight into the interfacial ferromagnetic properties of complex oxide-heterostructures. Our polarity-tunable MTJs pave the way for oxide-based spintronics, in which the spin transport plays a crucial role. Furthermore, we also anticipate that these results may stimulate pursuit of two-dimensional ferromagnetism at oxide interfaces.
1. Thach D.N. Ngo, Jung-Won Chang, Kyujoon Lee, Seungju Han, Joon Sung Lee, Young Heon Kim, Myung-Hwa Jung, Yong-Joo Doh, Mahn-Soo Choi, Jonghyun Song, and Jinhee Kim, ‘Polarity-tunable magnetic tunnel junctions based on ferromagnetism at oxide heterointerfaces’, Nature Communications, 6, 8035(2015).
Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)
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번호 | 일시 | 장소 | 연사 | 제목 |
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공지 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. | Fall 2019: Physics Colloquium |
219 | DEC. 16~18 (Sun~Tue) | E6-2. 1st fl. #1323 | Prof. Keisuke Totsuka |
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217 | DEC. 27 (Thu), 04:00 PM | E6-2. 1st fl. #1323 | Prof. Na Young Kim |
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214 | Apr. 19 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Seok Kyun Son |
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213 | Apr. 19 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWoo Nam |
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212 | Sep. 10 (Tue.), 03:00 PM | E6-2. 1st fl. #1323 | Dr. Mikhail Kiselev |
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211 | Sep. 27 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Jindong Song |
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207 | Apr. 5 (Tue.), 4PM | E6-2. 1st fl. #1322 | Dr. Ara Go, Columbia University | A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space |
206 | 2015/09/07, 3PM | E6-2. 1st fl. #1318 | Dr. Jasbinder Sanghera (U.S. Naval Research Laboratory (NRL)) | Advanced Optical Materials and Devices at NRL |
205 | 4pm, Sep. 21 (Wed. | E6-2. #2502(2nd fl.) | Dr. Henrik Johannesson , University of Gothenburg (Sweden) and Beijing Computational Science Research Center (China) | Entanglement probe of two-impurity Kondo physics |
204 | Sep. 29 (Thu), 4:00 PM | E6-2. #2501(2nd fl.) | Dr. Minu Kim, Institute for Basic Science, Seoul National University | Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip? |
203 | 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 |
202 | May 24 (Tue) 4 PM | E6-2. #1323(1st fl.) | Dr. Euyheon Hwang, SKKU Advanced Institute of Nanotechnology, Sung Kyung Kwan University | Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density |
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200 | Oct. 07 (Fri), 4:00 PM | E6-2. #1323(1st fl.) | Dr. Choong Hyun Kim,IBS-CCES, Seoul National University | “Tilt engineering of 4d and 5d transition metal oxides?” |