visual
visual

세미나

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

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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
405 2023-08-24 11:00    Advancing magnonic metamaterials: spin waves in nanomagnetic arrays
404 2024-05-28 10:00    Mixed-State Quantum Spin Liquids and Dynamical Anyon Condensations in Kitaev Lindbladians
403 2019-11-28 16:00    Generation of coherent EUV emissions using ultrashort laser pulses file
402 2022-05-20 11:00    (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals
401 2019-05-09 16:00    Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
400 2019-05-09 16:00    Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
399 2020-02-12 13:00    From inflation to new weak-scale file
398 2025-05-22 14:30  Prof. Keun Su Kim (The Univ. of Yonsei)  Sublattice-interference model for Fermi arcs in cuprates file
397 2018-10-24 10:30    Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers file
396 2018-06-14 10:00    Phonons and polariton-like particles in trapped ions for quantum computation and quantum simulation file
395 2018-12-16 16:00    Lectures on 2d Conformal Field Theory file
394 2023-11-22 16:00    [High Energy Theory Seminar] Renormalization and the Hierarchy Problem
393 2024-08-22 16:00    [CAPP seminar] Development of a 12-20 GHz CO Intensity Mapping Receiver for Capturing the Star-formation History in the Early Universe file
392 2022-12-20 16:00    Getting into Biology and Medicine as Physicist
391 2019-03-26 15:00    Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets file
390 2022-06-03 09:30    (Quantum-&Nano-Photonics Webinar) Seeing glass in a new light: reimagine chalcogenide photonics file
389 2018-10-11 16:00    Dirac electrons in a graphene quasicrystal file
388 2019-10-29 14:30    Quantum sensing file
387 2025-05-02 11:00  Prof. Joonho Jang  Anderson localization of electrons in a moire-of-moire lattice of helical twisted trilayer graphene file
386 2019-05-02 16:00    Anomalous optical properties of halide perovskites file