김상국
Kim, Sang-Koog
- Email : sangkoog@snu.ac.kr
- Mailstop : 33-218
- Phone : 880-5854
- Fax : 885-1457
- Homepage : https://www.sdsw.snu.ac.kr
Education
Ph. D : POSTECH, Department of Materials Science and Engineering
M.S : POSTECH, Department of Materials Science and Engineering
B.S : KAIST, Department of Materials Science and Engineering
Career
Nanomagnetism (VERSITA), Editorial Board
Spin (World Scientific), Editorial Board
Director of National Creative Research Initiative Center for Spin dynamics and Spinwave devices (ReC-SDSW)
Professor, Seoul National University
Research Professor, Korea Advanced Institute of Science and Technology
Post Doctoral Associate, Lawrence Berkeley National Lab.
Research Interests
1. Spin-wave dynamics and applications
2. Magnetic vortex dynamics and applications
3. Information storage and logic devices based on nanomagnetism
4. Energy harvesting based on nanomagnets
Selected Publications
1. Patents* Magnonic crystal spin wave devices capable of controlling spin wave frequency (PCT/KR2009/002850, KOR 10-0947582 )
* Method of controlling magnetization easy axis in ferromagnetic films using voltage, ultrahigh-density, low power, nonvolatile magnetic memory using the control method, and method of writing information on the magnetic memory (US 6829157 B2, KOR 0451660)
* 4-digit nonvolatile magnetic memory cell structure, operating method and its extensive technology for ultra-high
density multi-digits nonvolatile magnetic memory (KOR 10-0544-690-00-00)
* Method of generating strong spin waves and spin devices for ultra-high speed information processing using spin
waves (PCT/KR2006/003874, KOR 10-2006-0092742)2. Papers* Tunable negligible-loss energy transfer between dipolar-coupled magnetic disks by stimulated vortex gyration ,
Sci. Rep-UK(Nature Publishing Group), 1, 59 (2011)
* Edge-soliton-mediated vortex-core reversal dynamics , Phys. Rev. Lett., 106, 147201 (2011)
* Physical origin and generic control of magnonic band gaps of dipole-exchange spin waves in widthmodulatednanostrip waveguides , Phys. Rev. Lett., 102, 127202 (2009)
* Universal criterion and phase diagram for switching a magnetic vortex core in soft magnetic nanodots , Phys. Rev. Lett., 101, 267206 (2008)
* Dynamic Origin of Vortex Core Switching in Soft Magnetic Nanodots , Phys. Rev. Lett., 100, 027203 (2008).
* Strong Radiation of Spin Waves by Core Reversal of a Magnetic Vortex and their Wave Behaviors in Magnetic Nanowire Waveguides , Phys. Rev. Lett., 98, 087205 (2007) (Nature Research Highlight, Vol. 446, issue 7131, page 5)
* A giga-hertz-range spin-wave filter composed of width-modulated nanostrip magnonic-crystal waveguides, Appl. Phy. Lett., 95, 082507 (2009) (The cover of the 24 August 2009 issue)
* Reliable low-power control of ultrafast vortex-core switching with the selectivity in arrays of vortex states by inplane circular-rotational magnetic fields and spin-polarized currents , Appl. Phys. Lett., 92, 022509 (2008) (Cover paper).
* Spin-wave interference , Appl. Phys. Lett., 89, 062501 (2006) (Cover paper)
* Radiation of spin waves from magnetic vortex cores by their dynamic motion and annihilation processes, Appl. Phys. Lett., 87, 192502 (2005) (Cover paper) [100 publications in SCI journals]
Lab Overview
Our lab has been one of pioneers in computational micromagnetic modeling in the areas of nanomagnetism and spin dynamics for exploiting fundamental ultrafast dynamics in geometrically restricted nanomagnets. Our lab is now focusing on the developments of ultrahigh speed, ultra-high density memory and logic devices based on magnetic vortices and spin waves.