visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-11-04 13:30 
일시 Nov. 04 (Fri), 1:30 PM 
장소 E6-2. #1323(1st fl.) 
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)

번호 날짜 장소 제목
공지 2022-11-25 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) DMFT+ NRG: From models to real materials, from local to nonlocal correlations
288 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
287 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
286 2017-04-28 14:30  E6-2. 1st fl. #1323  Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
285 2016-10-18 15:00  E6-2. 1st fl. #1323  “Hybrid quantum systems with mechanical oscillators”
284 2016-04-12 16:00  E6-2. 1st fl. #1323  Confinement of Superconducting Vortices in Magnetic Force Microscopy
283 2016-04-05 16:00  E6-2. 1st fl. #1322  A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
282 2015-09-07 15:00  E6-2. 1st fl. #1318  Advanced Optical Materials and Devices at NRL
281 2016-09-21 16:00  E6-2. #2502(2nd fl.)  Entanglement probe of two-impurity Kondo physics
280 2016-09-29 16:00  E6-2. #2501(2nd fl.)  Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
279 2022-12-20 16:00  E6-2. #2501  Getting into Biology and Medicine as Physicist
278 2016-11-10 16:00  E6-2. #1323(1st fl.)  Low Dimensional Active Plasmonics and Electron Optics in Graphene
277 2016-11-04 15:00  E6-2. #1323(1st fl.)  Quantum information experiments using few electron spins in semiconductors
» 2016-11-04 13:30  E6-2. #1323(1st fl.)  Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications
275 2016-10-07 16:00  E6-2. #1323(1st fl.)  “Tilt engineering of 4d and 5d transition metal oxides?”
274 2016-10-07 13:30  E6-2. #1323(1st fl.)  “Symmetry and topology in transition metal dichalcogenide?”
273 2016-05-24 16:00  E6-2. #1323(1st fl.)  Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density
272 2016-05-11 16:00  E6-2. #1323(1st fl.)  The quest for novel high-temperature superconductors---Prospects and progress in iridates
271 2022-05-19 16:00  E6-2. #1323 & Zoom  Chasing Long Standing Neutrino Anomalies with MicroBooNE
270 2022-05-18 16:00  E6-2. #1323 & Zoom  Geometry, Algebra, and Quantum Field Theory
269 2022-05-12 16:00  E6-2. #1323 & Zoom  New frontiers of electroweak physics at the LHC