Associate Professor of Physics and Engineering Physics
Publications:
G. S. Chang, J. Forrest, E. Z. Kurmaev, A. N. Morozovska, M. D. Glinchuk, J. A. McLeod, A. Moewes, T. P. Surkova and Nguyen Hoa Hong, Oxygen vacancy induced ferromagnetism in undoped SnO2 thin films, Phys. Rev. B (Submitted).
A. Hunt, D. Dikin, E. Z. Kurmaev, T. D. Boyko, P. Bazylewski, G. S. Chang and A. Moewes, Epoxide Speciation and Functional Group Distribution in Graphene Oxide Paper-like Materials, ACS Nano (Submitted).
See Kei Lee, Ryo Yamada, Shoji Tanaka, Gap Soo Chang, Yoshihiro Asai, Hidetoshi Fukuyama and Hirokazu Tada, Universal Temperature Crossover Behavior of Electrical Conductance in Single Oligothiophene Molecular Wire, ACE Nano (Submitted).
H. Bieber, S. Colis, A. Dinia, G. Schmerber, V. Pierron-Bohnes, D. W. Boukhvalov, E. Z. Kurmaev, L. D. Finkelstein, P. Bazylewski, A. Moewes and G. S. Chang, Effect of Ag co-doping on the magnetic properties and local bonging structure of ZnO:Co thin films, Mater. Chem. Phys. (Submitted).
Sanjeev Gautam, Keun Hwa Chae, P. Thakur, Abhinav Pratap Singh, J.-Y. Kim, G. S. Chang, M. Subramanian, R. Jayavel and K. Asokan, Soft x-ray magnetic circular dichroism, x-ray absorption and emission spectroscopic study of Zn1-xCoxO thin films, J. Phys. Chem. C (Submitted).
J. Jin, X. Y. Zhang, Y. X. Zhang and G. S. Chang, Annealing effect on the electronic structure and magnetic properties of Mn-doped ZnO films, Semicond. Sci. Technolo. 27, 035012 (2012).
Paul F. Bazylewski, Kyung Hwan Kim, Jay L. Forrest, Hirokazu Tada, Dong Hoon Choi and Gap Soo Chang, Side-Chain effects on electronics structure and molecular stacking arrangment of PCBM spin-coated films, Chem. Phys. Lett. 508, 90-94 (2011).
R. J. Green, G. S. Chang, X. Y. Zhang, A. Dinia, E. Z. Kurmaev and A. Moewes, Identifying local dopant structures and their impact on the magnetic properties of spintronic materials, Phys. Rev. B 83, 115207 (2011).
Regan G. Wilks, Gap Soo Chang, Kyung Hwan Kim, Dong Hoon Choi and Alexander Moewes, Molecular orientation and optical luminescence properties of soluble star shaped oligothiophene molecules for organic electronics applications, J. Electron Spectrosc. 184, 355-359 (2011).
J. Jin, G. S. Chang, Y. X. Zhou, X. Y. Zhang, D. W. Boukhvalov, E. Z. Kurmaev and A. Moewes, X-ray absorption and emission spectroscopic investigation of Mn doped ZnO films, Appl. Surf. Sci. 257, 10748-10751 (2011).
A. Bouaine, R. J. Green, S. Colis, P. Bazylewski, G. S. Chang, A. Moewes, E. Z. Kurmaev and A. Dinia, Appearance of Ferromagnetism in Co-doped CeO2 Diluted Magnetic Semiconductors Prepared by Solid-State Reaction, J. Phys. Chem. C 115, 1556-1560 (2011).
A. N. Titov, Yu. M. Yarmoshenko, G. S. Chang, M. V. Yablonskikh, E. Z. Kurmeav, R. Wilks. A. Moewes, V. A. Tsurin, V. V. Fedorenko, O. N. Surorova, S. Yu. Ketkov, P. Bazylewski and M. Neumann, Electronic Structure and physical properties of ferrocene intercalated into TiSe2, Chem. Phys. Lett. 497, 187-190 (2010).
J. Jin, G. S. Chang, D. W. Boukhvalov, X. Y. Zhang, L. D. Finkelstein, W. Xu, Y. X. Zhou, E. Z. Kurmaev and A. Moewes, Electronic structure of Mn dopants and ferromagnetism of (Zn,Mn)O thin films, Thin Solid Films 518, 2825-2829 (2010).
G. S. Chang, E. Z. Kurmaev, D. W. Boukhvalov, L. D. Finkelstein, A. Moewes, H. Bieber, S. Colis and A. Dinia, Co and Al co-doping for ferromagnetism
in ZnO:Co diluted magnetic semiconductors, J. Phys.: Condens. Matter 21, 056002 (2009).
J. H. Seo, R.G. Wilks, A. Moewes, C. N. Whang, K. H. Chae, S. J. Cho, K.-H. Yoo and G. S. Chang, Unipolar-to-ambipolar conversion of rubrene thin-film transistors by organosilane self-assembled monolayer, J. Phys. Chem. B 112, 16266-16270 (2008).
P. Thakur, K. H. Chae, C. N. Whang, G. S. Chang D. K. Shukla, S. Mollah and R. Kumar, X-ray Absorption and Emission Spectroscopic Studies of BiMn2-xTixO5 (0
D. S. Park, W. C. Jang, S. W. Cho, J. H. Seo, I. S. Jeong, T. W. Kim, G. S. Chang A. Moewes, K. H. Chae, K. Jeong, K.-H. Yoo and C. N. Whang, Influence of 2-mercapto-5-nitrobenzimidazole treatment on the electronic characteristics of bottom-contact organic field-effect transistors, Org. Electron. 9, 1010 (2008).
G. S. Chang, E. Z. Kurmaev, D.W. Boukhvalov, A. Moewes, L.D. Finkelstein, M. Wei and J. L. MacManus-Driscoll, Defect-induced Ferromagnetism in Mn-doped Cu2O, J. Phys.: Condens. Matter 20, 215216 (2008).
G. S. Chang, E. Z. Kurmaev, D.W. Boukhvalov, L.D. Finkelstein, S. Colis, T. Pedersen, A. Moewes and A. Dinia, Effect of Co and O defects on the ferromagnetism in Co-doped ZnO: Experimental and theory, Phys. Rev. B 75, 195215 (2007).
J. H. Seo, T. M. Pedersen, G. S. Chang, A. Moewes, S. W. Cho, K. -H. Yoo, S. J. Cho and C. N. Whang, Probing interfacial characteristics of rubrene/pentacene and pentacene/rubrene bilayers with soft x-ray spectroscopy, J. Phys. Chem. B 111, 9513 (2007).
G. S. Chang, E. Z. Kurmaev, S. W. Jung, G.-C. Yi, M. V. Yablonskikh, T. Pederson, A. Moewes and L. D. Finkelstein, Local electronic structure of Mn dopants in ZnO probed by resonant inelastic x-ray scattering, J. Phys.: Condens. Matter 19, 276210 (2007).
G. S. Chang, E. Z. Kurmaev, L. D. Finkelstein, H. K. Choi, W. O. Lee, Y. D. Park, T. M. Pedersen and A. Moewes, Post-annealing effect on the electronic structure of Mn atoms in Ga1-xMnxAs probed by resonant inelastic x-ray scattering, J. Phys.: Condens. Matter 19, 076215 (2007).
J. H. Seo, C. Y. Kim, S. J. Kang, K.-H. Yoo, C. N. Whang, A. Moewes and G. S. Chang, Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy, J. Chem. Phys. 126, 064706 (2007).
G. S. Chang, E. Z. Kurmaev, L. D. Finkelstein, N. A. Babushkina, A. Moewes and T. A. Callcott, Probing changes in the Mn 3d band of Sm0.525Sr0.475MnO3 induced by oxygen isotope substitution, Phys. Rev. B 74, 125105 (2006).
J. H. Seo, C. N. Whang, and K.-H. Yoo, G. S. Chang, T. Pedersen, A. Moewes, K. H. Chae and S. J. Cho, Buffer layer effect on the structural and electrical properties of rubrene-based organic thin-film transistors, Appl. Phys. Lett. 89, 163205 (2006).
G. S. Chang, E. Z. Kurmaev, D. W. Boukhvalov, L. D. Finkelstein, D. H. Kim, T.-W. Noh, A. Moewes and T. A. Callcott, Probing charge carriers in Co-doped anatase TiO2 thin films with soft x-ray fluorescence, J. Phys.: Condens. Matter 18, 4243 (2006).
G. S. Chang, A. Moewes, S. H. Kim, J. Lee, K. Jeong, C. N. Whang, D. H. Kim and S.-C. Shin, Uniaxial in-plane magnetic anisotropy of a CoPt thin film induced by ion irradiation, Appl. Phys. Lett. 88, 092504 (2006).
S. J. Kang, Y. Yi, C. Y. Kim, K. –H. Yoo, A. Moewes, M. H. Cho, J. D. Denlinger, C. N. Whang and G. S. Chang, Chemical reaction at the interface between pentacene and HfO2, Phys. Rev. B 72, 205328 (2005).
S. J. Kang, Y. Yi, C. Y. Kim, C. N. Whang, T. A. Callcott, K. Krochak, A. Moewes and G. S. Chang Analysis of octadecyltrichlorosilane treatment of organic thin-filmtransistors using soft x-ray fluorescence spectroscopy, Appl. Phys. Lett. 86, 232103 (2005).
S. H. Kim, J. –H. Yune, S. W. Shin, H. B. Kim, G. S. Chang, C. N. Whang, K. H. Chae and K. Jeong, The control of in-plane magnetic anisotropy by ion irradiation, Phys. Status Solidi (b) 241, 1654 (2004).
G. P. Zhang, G. S. Chang, T. A. Callcott, D. L. Ederer, W. N. Kang, E. M. Choi, H. J. Kim and S. I. Lee, Unoccupied and occupied electronic states of single crystal MgB2: Angle-resolved soft x-ray spectroscopy study, Phys. Rev. B 67, 174519 (2003).
G. S. Chang, T. A. Callcott, G. T. Woods, S. H. Kim, K. Jeong, C. N. Whang and A. Moewes, Angular rotation of magnetic hysteresis of ion-irradiated ferromagnetic thin films, Appl. Phys. Lett. 81, 3016 (2002).
G. T. Woods, G. P. Zhang, T. A. Callcott, L. Lin, G. S. Chang, B. Sales, D. Mandrus and J. He, Site-selected O 2p densities of states in NaV2O5 determined from angular-dependent x-ray absorption and emission spectra, Phys. Rev. B. 65, 165108 (2002).
G. P. Zhang, G. T. Woods, Eric L. Shirley, T. A. Callcott, L. Lin, G. S. Chang, Brian Sales and D. Mandrus, Orbital-resolved soft x-ray spectroscopy in NaV2O5, Phys. Rev. B. 65, 165107 (2002).
E. Z. Kurmaev, K. Endo, T. Ida, T. Otsuka, S. Y. Kim, G. S. Chang, A. Moewes, N. Y. Kim, C. N. Whang and D. L. Ederer, The Electronic Structure of TPD films grown by different methods, Org. Electron. 3, 15 (2002).
J. H. Son, T. G. Kim, G. S. Chang, C. N. Whang, J. H. Song and K. H. Chae, Ion beam induced atomic transport in bilayer systems, Curr. Appl. Phys. 2, 117 (2002).
G. S. Chang, Y. P. Lee, J. Y. Rhee, J. Lee, K. Jeong, C. N. Whang and Y. P. Lee, Realization of a large magnetic moment in the ferromagnetic bulk phase, Phys. Rev. Lett. 87, 67208 (2001).
G. S. Chang, J. H. Son, K. H. Chae, C. N. Whang, E. Z. Kurmaev, S. N. Shamin, V. R. Galakhov, A. Moewes and D. L. Ederer, Soft x-ray fluorescence and photoluminescence of Si nanocrystals embedded in SiO2, Appl. Phys. A 72, 303 (2001)
G. S. Chang, S. H. Kim, K. H. Chae, E. Z. Kurmaev, V. Galakhov, A. Moewes, Y P. Lee, K. Jeong and C. N. Whang, The electronic structure of ion beam mixed ferromagnetic multilayered films, J. Electron Spectrosc. 114-116, 807 (2001)
G. S. Chang, C. N. Whang, J. Y. Rhee and Y. P. Lee, Electronic and Structural Properties of Equiatomic Co-Pt Alloy Films at Low Temperature, J. Appl. Phys. 87, 1775 (2000).
E. Z. Kurmaev, R. P. Winarski, J. –C. Pivin, D. L. Ederer, S. N. Shamin, A. Moewes, K. Endo, T. Ida, G. S. Chang and C. N. Whang, Chemical reactions in polymers induced by ion beam mixing: fluorescence x-ray measurements, J. Electron Spectrosc. 110-111, 87 (2000).
G. S. Chang, T. Y. Kim, K. H. Chae, J. Lee, K. Jeong, C. N. Whang, E. Z. Kurmaev, A. Moewes and Y. P. Lee, Electronic Properties of Ion Beam Mixed Co/Pt Multilayered Films, J. Kor. Phys. Soc. 37, 438 (2000).
S. J. Kang, J. Lee, Y. D. Chung, K. Y. Lim, Y. S. Lee, S. Y. Kwon, G. S. Chang and C. N. Whang, Simultaneous measurement of two components of magnetization with MOKE, J. Kor. Phys. Soc. 37, 414 (2000).
G. S. Chang, C. N. Whang, E. Z. Kurmaev, D. A. Zatsepin, R. P. Winarski, D. L. Ederer, A. Moewes and Y. P. Lee, Probing a buried buffer layer between metal and polymer with soft X-ray fluorescence, 1999 Scientific Highlight of Polymer/Biomaterials/Soft Matter Section of ALS, ALS Activity Report p.18-19 (2000).
G. S. Chang, K. H. Chae, C. N. Whang, E. Z. Kurmaev, D. A. Zatsepin, R. P. Winarski, D. L. Ederer, A. Moewes and Y. P. Lee, Mechanism for interfacial adhesion strength of ion beam mixed Cu/polyimide with a thin buffer layer, Appl. Phys. Lett. 74, 522 (1999).
K. H. Chae, J. H. Son, G. S. Chang, H. B. Kim, S. Im, C. N. Whang, J. H. Song, K. J. Kim and H. K. Kim, Visible photoluminescence in ion beam mixed SiO2/Si/SiO2 layers, Nanostruct. Mater. 11, 1239-1243 (1999).
E. Z. Kurmaev, D. A. Zatsepin, R. P. Winarski, S. Stadler, D. L. Ederer, A. Moewes, V. V. Fedorenko, S. N. Shamin, V. R. Galakov, G. S. Chang and C. N. Whang, X-ray Emission Study of Ion Beam Mixed Metal/Polymer Interfaces, J. Vac. Sci. Technol. A 17, 593 (1999).
G. S. Chang, T. G. Kim, K. H. Chae, C. N. Whang, J. I. Jeong and Y. P. Lee, Cohesive Energy Effect on the Atomic Transport in the Ion Beam Mixed Co/Pt Bilayered Film, Thin Solid Films 341, 234 (1999).
G. S. Chang, K. H. Chae, C. N. Whang and Y. P. Lee, Properties of Ion Beam Mixed Co/Pt Multilayered Films, J. Mag. Soc. Jpn. 23, 646 (1999).
E. Z. Kurmaev, R. P. Winarski, D. L. Ederer, J.-C. Pivin, S. N. Shamin, A. Moewes, T. A. Collcott, G. S. Chang and C. N. Whang, Soft X-ray fluorescence measurements of irradiated polyimide and polycarbonsilane films, J. Electron Spectrosc. 101, 565 (1999).
G. S. Chang, J. H. Son, C. N. Whang, E. Menthe, K.–T. Rie and Y. P. Lee, Electronic Structures and Nitride Formation of Ion Implanted AISI 304L Austenitic Stainless Steel, Surf. Coat. Technol. 112, 291 (1999).
R. P. Winarski, D. L. Ederer, E. Z. Kurmaev, S. N. Shamin, K. Endo, T. Ida, A. Moewes, G. S. Chang, S. Y. Kim and C. N. Whang, Soft X-ray fluorescence measurements of polyimide films, Thin Solid Films 357(2), 91 (1999).
G. S. Chang, S. H. Kim, J. H. Son, T. Y. Kim, K. H. Chae, J. Lee, K. Jeong, C. N. Whang, E. Z. Kurmaev, A. Moewes and Y. P. Lee, Electronic Structures of Ferromagnetic Ion Beam Mixed Co/Pt Films, J. Kor. Vac. Soc. 8(S1), 82 (1999)
R. Winarski, D. L. Ederer, J.-C. Pivin, E. Z. Kurmaev, S. N. Shamin, A. Moewes, G. S. Chang, C. N. Whang, K. Endo and T. Ida, Soft X-ray Fluorescence Measurements of Irradiated Polymer Films, Nucl. Instrum. Methods B 145, 401 (1998).
G. S. Chang, S. M. Jung, Y. S. Lee, I. S. Choi, C. N. Whang, J. J. Woo and Y. P. Lee, Adhesion enhancement of ion beam mixed Cu/Al/polyimide, J. Appl. Phys. 81, 135 (1997).
G. S. Chang, S. M. Jung, J. H. Song, H. B. Kim, J. J. Woo, D. H. Byun and C. N. Whang, Cohesive energy effects on the atomic transport induced by ion beam mixing, Nucl. Instrum. Methods B 121, 244 (1997).
G. S. Chang, T. G. Kim, K. H. Chae, C. N. Whang, D. S. Zatsepin, E. Z. Kurmaev, H. S. Choe and Y. P. Lee, Enhanced Adhesion Strength of Cu/polyimide and Cu/Al/polyimide by Ion Beam Mixing, J. Kor. Vac. Soc. 6(S1), 122 (1997).
Y. P. Lee, K.W. Kim, G. M. Lee, Y. V. Kudryavtsev, G. S. Chang and C. N. Whang, Properties of Magneto-optical Co-Pt and Magnetoresistive Co-Cu Alloy Films, Mater. Res. Soc. Symp. Proc. 475, 437 (1997).
G. M. Lee, K. W .Kim, Y. P. Lee, H. W. Joo, D. Jeon, G. S. Chang and C. N. Whang, Magnetic Force Microscopy and Atomic Force Microscopy Study of Co Alloy Films, J. Kor. Phys. Soc. 31, S74 (1997).
K. W. Kim, Y. V. Kudryavtsev, G. S. Chang, C. N. Whang and Y. P. Lee, Spin Polarized Photoemission and Magnetic Circular Dichroism Study of FeAl Thin Films, J. Kor. Vac. Soc. 6(S1), 53 (1997).
S. M. Jung, G. S. Chang, J. H. Song, K. H. Chae, K. Jeong, J. J. Woo and C. N. Whang, A Model for the Atomic Transport Induced bt the Radiation Enhanced Diffusion, J. Kor. Phys. Soc. 28, 481 (1995).
S. M. Jung, G. S. Chang, J. K. Kim, S. O. Kim, J. J. Woo and C. N. Whang, Reduction of the Ti Silicide Formation Temperature by Ar+ Ion Bombardment, J. Kor. Phys. Soc. 27, 572 (1994).
Paul Bazylewski
Ph. D. Graduate Student
Publications:
Paul F. Bazylewski, Kyung Hwan Kim, Jay L. Forrest, Hirokazu Tada, Dong Hoon Choi, Gap Soo Chang, Side-Chain effects on electronics structure and molecular stacking arrangment of PCBM spin-coated films. Chem. Phys. Lett. 503 (2) 2011. Zhang,
A. Bouaine, R. J. Green, S. Colis, P. Bazylewski, G. S. Chang, A. Moewes, E. Z. Kurmaev, A. Dinia, Appearance of Ferromagnetism in Co-doped CeO2 Diluted Magnetic Semiconductors Prepared by Solid-State Reaction. J. Phys. Chem. C. 225 (5) 2011.
A. N. Titov, Yu. M. Yarmoshenko, G. S. Chang, M. V. Yablonskikh, E. Z. Kurmeav, R. Wilks. A. Moewes, V. A. Tsurin, V. V. Fedorenko, O. N. Surorova, S. Yu. Ketkov, P. Bazylewski and M. Neumann, Electronic Structure and physical properties of ferrocene intercalated into TiSe2. Chem. Phys. Lett. 497 (5) 2010.
Jay Forrest
M. Sc. Graduate Student
Publications:
Paul F. Bazylewski, Kyung Hwan Kim, Jay L. Forrest, Hirokazu Tada, Dong Hoon Choi, Gap Soo Chang, Side-Chain effects on electronics structure and molecular stacking arrangment of PCBM spin-coated films. Chem. Phys. Lett. 503 (2) 2011. Zhang,