Research Center for Dielectric and Advanced Matter Physics,

Pusan National Univ., Busan 46241, S. Korea

Tel. +82-51-510-3528(Off.) +82-10-8793-8023(Mob.)

E-mail: sangkyun@pusan.ac.kr

Google Scholar : https://scholar.google.com/citations?user=LbQFbIcAAAAJ&hl=ko&oi=ao

ORCID: https://orcid.org/0000-0003-4817-538X

 EDUCATION                                                                              

• Ph. D. in physics, Pusan National University, S. Korea, Mar. 2018 - Aug. 2024
• M.S. in Physics, Pusan National University, S. Korea, Mar. 2016 - Feb. 2018
• B.S. in Physics, Pusan National University, S. Korea, Mar. 2009 - Aug. 2016                                                                                                                                       

 RESEARCH EXPERIENCES                                                             

• Graduate Research Assistant, Department of Physics, Pusan National University (Advisor: Prof. Hyoungjeen Jeen),
  Mar. 2016 ~ Aug. 2024
• Postdoctoral Researcher, Department of Physics, Pusan National University
  Sep. 2024 ~ Aug. 2025025

• Postdoctoral Researcher, Research Center for Dielectric and Advanced Matter Physics, Pusan National University
  Sep. 2025 ~ current
• Research Theme: Magnetic Materials, Manganite, Polarized Neutron Reflectivity, In-situ Transport and X-ray Diffraction

SKILLS and EXPERTISE                                                                            

• Sample Synthesis (Thin Films) Pulsed Laser Deposition, DC/RF Magnetron Sputtering, Thermal Evaporation, (Bulk) Solid State Reaction
• Measurement Methods: Atomic Force Microscope, X-ray Diffractometer, Scanning Electron Microscope, SQUID, VSM, DC transport, Impedance Analyzer, Spectroscopic Ellipsometer, UV/Vis/NIR Spectrophotometer, X-ray Absorption Spectroscopy

 LIST OF PUBLICATIONS                                                                            

1. J. Lee, Y. S. Seo, K. C. Pitike, G. Kim, S. Ryu, H. Chung, S. R. Park, S. Yoon, Y. Kim, V. R. Cooper, H. Ohta, J. Cho and H. Jeen, Selective reduction in epitaxial SrFe_0.5Co_0.5O_2.5 and its reversibility. Nature Communications, 16, 7391 (2025)

2. S. Ryu, S. Y. Park, Y. Kim, S. Y. Nam, J. Park, L. Hao, J. Liu, J. H. Cho, and H. Jeen, Strain-driven charge localization in lightly hole-doped manganite epitaxial films. Appl. Surf. Sci.,  163145 (2025) [First Author]

3. J. Lee, S. Y. Cho, I. Kim, C. M. Rouleau, K. Kang, S. Ryu, Y. Heo, J. K. Keum, D. M. Pajerowski, Y. Kim, S. D. Bu, J. Lee, and H. Jeen, Multiferroism in strained strontium hexaferrite epitaxial thin films, Phys. Rev. Mater.  024401 (2024)

4. S. Ryu, J. Hwang, J. Cho, Y. Kim, A. Seo, J. Lee, and H. Jeen, Modification of Band Structure by Oxygen Filling in Epitaxial La_0.88Sr_0.12MnO_3?x thin films, ACS Appl. Electron. Mater. 6 370 (2023) [First Author]

5. Y. M. Kwak, K. L. Oh, Y. J. Ko, S. H. Park, S. Ryu, M. S. Kim, K. T. Lee, M. Lee, H. Jeen, J. H. Jung, Magnetoresistance of epitaxial SrRuO₃ thin films on a flexible CoFe₂O₄-buffered mica substrate, Curr. Appl. Phys.  71 (2022)

6. S. Ryu, D. Cho, J. K. Park, J. S. Lee, T. E. Hong, M. Byeon and H. Jeen, Ferromagnetism in defective yttria-stabilized zirconia, Curr. Appl. Phys.  66 (2022) [First Author]

7. J. Lee, S. Ryu, I. Kim, M. Byeon, M. H. Jeong, J. S. Lee, T. E. Hong, J. Cho, J. Lee, J. K. Park, H. Jeen, Large enhancement of magnetic moment in nitridated CeFe₁₂, J. Alloys Compd.  161245 (2021) [Co-first Author]

8. G. Kim, B. Feng, S. Ryu, H. J. Cho, H. Jeen, Y. Ikuhara, and H. Ohta, Anisotropic electrical conductivity of oxygen-deficient tungsten oxide films with epitaxially stabilized 1D atomic defect tunnels, ACS Appl. Mater. Interfaces.  6864 (2021)

9. S. Choi, J. Kang, S. Ryu, H. Jeen, J. Son and S. Lee, High infrared transparency up to 8-μm wavelength in correlated vanadium Wadsley conductors, APL Mater.  041111 (2020)

10. C. W. Ahn, J. H. Jo, J. C. Kim, H. Ullah, S. Ryu, Y. Hwang, J. S. Choi, J. Lee, S. Lee, H. Jeen, Y. H. Shin, H. Y. Jeong, I. W. Kim and T. H. Kim, Highly ordered lead-free double perovskite halides by design, J. Materiomics  651 (2020)

11. Y. Kim, S. Ryu and H. Jeen Strain-effected physical properties of ferromagnetic insulating La_0.88Sr_0.12MnO₃ thin films RSC adv.  2645 (2019) [Co-first Author]

12. H. Kong, E. Ahn, G. Kim, S. Ryu, S. Park, H. Jeen, T. Jeon, Y. Kim, J. Cho, Thickness dependence on the magnetism in Mo-capped epitaxial Fe films, J. Korean Phys. Soc.  622 (2018)

13. S. Ryu, J. Lee, E. Ahn, J. Kim, A. Herklotz, J. Bae, H. N. Lee, Y. Kim, J. Kim, T. Jeon, J. Cho, S. Park, and H. Jeen, Growth of electronically distinct manganite thin films by modulating cation stoichiometry, Appl. Phys. Lett.  261601 (2017) [First Author]

LIST OF PRESENTATION                                                                                 

1. S. Ryu, R. Need, B. Kirby, T. Jeon, Sungkyun Park, H. Jeen, “Controlling magnetic contrast in manganite superlattices”, (2025.04.25) 2025 Korean Physical Society Spring meeting

2. S. Ryu, H. Jeen, H. Cho, J, Park, S, Nam S.-Y. Park, Y, Kim, “Strain-Driven Magnetic Anisotropy in La_0.88Sr_0.12MnO₃ thin Films on (110) NdGaO₃”, (2023.10.26) 2023 Korean Physical Society Spring meeting

3. S. Ryu, D. Cho, J. Park, J. S. Lee, T. Hong, M. Byeon, H. Jeen, “A thin defective layer formation in yttria-stabilized zirconia and its ferromagnetism”, (2022.01.21) Electronic Materials and Applications 2022

4. S. Ryu, D. Cho, J. Park, J. S. Lee, T. Hong, M. Byeon, H. Jeen, “A thin defective layer formation in yttria-stabilized zirconia and its ferromagnetism” (2021.10.21) 2021 Korean Physical Society fall meeting

5. S. Ryu, H. Jeen, J. Cho, Y. Kim, R, Need, B. Kirby, “The role of strain on magnetism and orbital anisotropy in La_0.88Sr_0.12MnO₃ epitaxial thin film.” (2018.11.22) International Symposium on magnetism and magnetic materials 2018

6. S. Ryu, G. Kim, S. Park, H. Jeen, R. Need, B. Kirby, H. Kim, T. Jeon, Y. Kim, H. N. Lee, “Controlling magnetic contrast in manganite superlattices” (2018.07.24) The 4th Emallia Conference 2018 RIKEN Symposium, 2018

7. S. Ryu, H. Jeen, H. Kim, J. Cho “Possible Interfacial Magnetism in Nd_1-xSr_xMnO₃ Multilayers” (2018.04.27) 2018 Korean Physical Society Spring meeting

8. S. Ryu, J. Lee, E Ahn, J. Kim, S. Park, H. Jeen, A. Herklotz, H. N. Lee, J. Bae, Y. Kim, J. Kim, T. Jeon, J. Cho, “Growth of electronically distinct manganite thin films by modulating cation stoichiometry” (2017.09.07) The 3rd Emallia Conference 2017 RIKEN Symposium

9. S. Ryu, J. Lee, E Ahn, J. Kim, S. Park, H. Jeen, A. Herklotz, H. N. Lee, J. Bae, Y. Kim, J. Kim, T. Jeon, J. Cho, “Growth of electronically distinct manganite thin films by modulating cation stoichiometry” (2017.04.20) 2017 Korean Physical Society Spring meeting

AWARDS                                                                                 

1. Winner of the first prize for the best poster presentation of ICABU 2022, S. Korea, November 2022

2. BK21 plus scholarship from the Ministry of Education, S. Korea, Mar. 2016 ~ 2022

3. Outstanding Presentation Award from the Korea Physics Society, S. Korea, November 2021

4. 13^th Central European Training School on Neutron Techniques, Budapest, 10^th May 2019

5. Outstanding Presentation Award from the Korea Physics Society, S. Korea, April 2018

6. Outstanding Presentation Award from the Korea Physics Society, S. Korea, April 2017

TEACHING EXPERIENCE                                                                                 

• Lab Teaching Assistant, Department of Physics, Pusan National University, Mar. 2016 - 2020