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)
586 2016-04-05 16:00    A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
585 2024-06-13 16:00    [CAPP seminars]Simulation, design and fabrication of Josephson Parametric Amplifiers for axion search file
584 2016-01-11 16:00    Mott Physics in the Strong Spin-Orbit Coupling Regime
583 2016-11-11 16:00    Dirac fermions in condensed matters
582 2019-06-28 14:00    1st Research-exchange meeting of computational material physics file
581 2025-06-05 11:00  Dr. Bruno Tomasello (University of Catania, Italy)  Crystal-Field Anisotropy and Low-Temperature Spin Seebeck in Terbium Iron Garnet file
580 2016-05-11 16:00    The quest for novel high-temperature superconductors---Prospects and progress in iridates
579 2018-02-12 15:00    The recent result of XMASS Experiment
578 2022-09-30 16:00    Spin-orbit torque-based spintronic devices file
577 2019-01-07 15:00    Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
576 2025-04-22 13:30  Dr. Chaebin Kim (Georgia Institute of Technology)  Emulation of quantum correlations by classical dynamics in quantum magnets file
575 2024-01-25 16:00    [CAPP seminars] Detecting Gravitational Waves by Elecromagnetic Cavity
574 2016-10-18 13:30    "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
573 2016-04-28 15:00    Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
572 2019-12-13 13:00    Computational Material Designs: Current Status and Future Directions file
571 2023-11-09 16:00    Assessing the Capability of Near-Term Photonic Devices Towards Quantum Supremacy
570 2018-09-04 14:30    Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses file
569 2016-04-08 16:00    Spectroscopic studies of iron-based superconductors : what have we learned?
568 2023-07-26 10:00    [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio
567 2016-10-07 16:00    “Tilt engineering of 4d and 5d transition metal oxides?”