Contact

University of Minnesota
School of Physics and Astronomy
116 Church St. SE
Minneapolis, MN 55455

Phone: (612) 626-9371 (lab)
           (612) 624-8840 (office)

E-mail: jpark@physics.umn.edu

EDUCATION

• Ph.D. in Experimental Condensed Matter Physics, University of Minnesota, Expected graduation: 05/2005. (GPA 4.00/4.00), Research topic: Spatially Resolved Spin Dynamics in Submicron Size Ferromagnetic Systems

• Master of Science in Physics, State University of New York at Buffalo (May 2001, GPA 3.805/4.00) Research topic: 1. Hole Transport in Poly(9-vinylcarbazole):CdS Nanoparticle Composites, 2. Photorefractivity in Inorganic:organic hybrid nanocomposites

• B.S. in Physics, Chung-Ang University, Seoul, Korea (February 1998, GPA 3.81/4.50 (cum laude))

COMPUTER SKILLS

Computer Platforms: Windows NT, 9X, 2000, XP, Unix, and especially Linux (administrator level)

Programming Languages: BASIC, C/ C++, GNU C++, and LabVIEW for device control, automation, data acquisition, and data analysis

Software Applications:

• Microsoft Office Programs including Word, Excel, PowerPoint, and Access

• Scientific Programs: Mathematica, Mathlab, Origin, SPSS statistical analysis program, and GIS (geographic Information System)

• Design Programs: AutoCAD, ICED mask design, 2D design (Adobe Photoshop and Illustrator), 3D design (Bryce and 3D Studio Max), and Web design (Dreamweaver and Microsoft Frontpage)

Simulation Programs:

• Micromagnetic Simulations: Oommf (Objective Oriented Micromagnetic Framework) and LLG simulator

• Microwave Device Simulation: Advanced Design System

RESEARCH EXPERIENCE

University of Minnesota, Minneapolis, MN

Research Assistant (07/01 - Present, Physics): current experiments focusing on spin dynamics in micron and nanometer size patterned ferromagnetic thin films with picosecond time resolution and submicron spatial resolution using a near-infrared or blue pulsed laser system and the magneto-optical Kerr effect.

• Micro- and Nano-Fabrications: electron beam lithography, photolithography, lift-off, wet/dry and mechanical etching, reactive ion etching, ion milling, and deposition using electron beam evaporator, DC and RF sputtering system, thermal evaporator, PECVD, and LPCVD at the University of Minnesota Nano-Fabrication Center.

• Semiconductor processing: fabrication of ohmic, Shottky, and transparent gate contacts on GaAs and Si substrate. Other general semiconductor processing including depth-controlled wet chemical etching..

• Characterization: study of magnetic properties using SQUID, magneto-optical Kerr effect (MOKE), and magnetic force microscopy (MFM), characterization of sample structures and crystalinities using scanning electron microscopy (SEM), atomic force microscopy (AFM), and wide-angle X-Ray diffraction, and general electrical measurements such as I-V measurements.

• Optics: near-infrared femtosecond pulsed laser system with second-harmonic generation and spatial filtering. Optical setup based experiments including time-resolved experiments (pump-probe technique), spatially-resolved scanning using high N.A. objective lens and oil-immersion lens, and polarization analysis for the Magneto-Optic Kerr Effect.

• Cryogenics: multiple types of LHe flow cryostats including Oxford Spectromag (down to 2 K) for low-temperature time-resolved Kerr effect measurement on GaMnAs.

• Microwave device: various types of microwave transmission line design for magnetic field pulse generation using Advanced Design System (ADS), fabrication, and testing with a network analyzer. Extensive experience with microwave device components.

• Programming for data acquisition and analysis: extensive use of LabView, Origin, Mathematica, and C/C++.

• Machining: extensive use of machine shop and AutoCAD for design

State University of New York at Buffalo

Research Assistant (06/00 - 05/01, Chemistry): focused on synthesizing a novel class of inorganic nanocrystal: polymer composites and characterizing physical properties such as photorefractivity, photoconductivity, and hole transport.

RESEARCH-BASED GRADUATE PROJECTS

Graduate Level Advanced Laboratory, State University of New York at Buffalo

• STM (Scanning Tunneling Microscope): Investigations of the electron-density superstructures on perturbed graphite surfaces.

• X-Ray diffraction experiment: determination of characteristic wavelength of the copper x-ray spectrum and of lattice parameters of KBr and Si crystals.

• Spectroscopy: determination of the energy gap of bulk GaAs and the conduction and valence confinement sub-band structure of GaAs/Al0.3Ga0.7As multiple quantum well structures using the optical reflectance spectral analysis.

Microelectronic Fabrication Laboratory, State University of New York at Buffalo

• Fabrication of a solar cell and a p-n diode using mask design, photolithography, oxide growth, diffusion, evaporation, sputtering, and patterning

• Measurements: Spectral response, I-V and C-V measurement, and sheet resistance

TEACHING EXPERIENCE

• State University of New York at Buffalo (01/00 - 07/01): Teaching Assistant for laboratory sections of physics courses

• Chung-Ang University, Seoul, Korea (03/96 - 01/98): Head of Department Study Group for Undergraduates: organized junior- and senior-level undergraduate students and taught variety of physics courses

• Jeong-Do Private Institute, Seoul, Korea (01/00 - 07/01): Physics and Mathematics Teacher for high school students

HONORS AND AWARDS

• Department Honor Scholarship (Chung-Ang University, Seoul, Korea) for excellent academic achievement: 1995, 1996, and 1997 academic years

• Graduated with Department Honor (Chung-Ang University, Seoul, Korea) on February 1998

• Doctoral Dissertation Fellowship for outstanding final-year Ph.D. candidates (University of Minnesota): 2004 - 2005 academic year

PUBLICATIONS

• Spin waves in an inhomogeneously magnetized stripe, C. Bayer, J. P. Park, H. Wang, M. Yan, C. E. Campbell, and P. A. Crowell, Phys. Rev. B 69, 134401 (2004)

• Imaging of spin dynamics in closure domain and vortex structures, J. P. Park, P. Eames, D. M. Engebretson, J. Berezovsky, and P. A. Crowell, Phys. Rev. B 67, 040203 (2003)

• Spatially Resolved Dynamics of Localized Spin-Wave Modes in Ferromagnetic Wires, J. P. Park, P. Eames, D. M. Engebretson, J. Berezovsky, and P. A. Crowell, Phys. Rev. Lett., 89, 277201 (2002)

• Inorganic:organic hybrid nanocomposites for photorefractivity at communication wavelengths, Winiarz JG, Liangmin Zhang, Jooho Park, Prasad PN, Journal of Physical Chemistry B, vol.106, no.5, pp.967 (2002)

• Time-Domain Ferromagnetic Resonance in Epitaxial Thin Films, D. M. Engebretson, J. Berezovsky, J. P. Park, L. C. Chen, C. J. PalmstrØm, and P. A. Crowell, J. Appl. Phys. 91, 8040 (2002)

ORAL PRESENTATIONS

• March 2004 American Physical Society (APS 2004 Spring), Montreal, Canada

• November 2003 Invited talk in American Vacuum Society (AVS) 50th International Symposium, Baltimore, MD, U.S.A.

• July 2003 International Conference on Magnetism (ICM 2003), Rome, Italy

• May 2003 IPRIME (Industrial Partnership for Research in Interfacial and Materials Engineering) 2003 Annual Meeting, University of Minnesota, Minneapolis, MN, U.S.A.

• April 2003 Invited talk in Physics Department Monthly Seminar, Chung-Ang University, Seoul, Korea

• March 2003 American Physical Society (APS 2003 Spring), Austin, TX, U.S.A.

• November 2002 Magnetism and Magnetic Materials (MMM 2002), Tampa, FL, U.S.A.