Personal Details

This page is maintained by .

Dr. Ji Rong

Senior Scientist II /Dy HOD, ACI

Staff

Advanced Characterisation and Instrumentation (ACI) Department

6319 4746

Ji_Rong@imre.a-star.edu.sg

2 Fusionopolis Way, Innovis, #08-03, Singapore 138634

https://www.linkedin.com/in/rong-ji-1639a634/


Research Details


 1.  Material characterisation metrology development

 2.  Surface / Interface characterisation and analysis

 3.  Failure Analysis


 1.  Material Characterization and Failure Analysis

 2.  Hands-on and advanced analysis using SIMS, XPS, AES, FTIR, Raman, AFM, SEMEDX,
      Contact Angle, TGA, etc.

 3.  CVD thin film deposition and semiconductor device development

 

 2005-2018 : Project Leader of “Material characterization and Failure Analysis”.

 2008-2011 : Project Leader of “Exploration of novel hard disk lubricant for heat assisted magnetic recording”.

 2003-2005 : Project Leader of “Organic Contamination/Outgas Induced Surface Change/Corrosion
                     of Hard Disk Media & Head”.

 

 Jun 2018-present : Deputy Head of Department / Senior Scientist,
                                Advanced Characterisation and Instrumentation, IMRE

 Jan 2000- May 2018 : Division Manager/ Senior Scientist/ Scientist,
                                     Materials Science Laboratory Division, DSI

 

 PhD, National University of Singapore, Singapore, 2006
 M.E., Nanyang Technological University, Singapore, 1996
 M.E., Northeastern University, Shenyang, China, 1992
 B.S. in Physics, Dalian University of Technology, China, 1987

 

 2014 DSI Best Paper Award

 2007/08 DSI Idea of The Year Award

 

 IEEE member
 PMP Certification


 Material Analysis Metrology Development

 1.     K. C. Xu, H. P. Yan, C. F. Tan, Y. Li, Y. Y. Lu, G. W. Ho, R. Ji, M. H. Hong, “Hedgehog Inspired CuO Nanowires/Cu2O Composites for Broadband Visible-Light-Driven Recyclable Surface Enhanced Raman Scattering,” Advanced Optical Materials, 6 (7) 1701167-1701175 (2018).


 2.     K. C. Xu, Z. Y. Wang, C. F Tan, N. Kang, L. W. Chen, L. Ren, E. S. Thian, Ghim W. Ho, R. Ji, M. H. Hong, “Uniaxially Stretched Flexible Surface Plasmon Resonance Film for Versatile Surface Enhanced Raman Scattering Diagnostics,” ACS Applied Materials Interfaces, 9 (31), 26341–26349 (2017).


 3.     K. C. Xu, C. Zhang, T. H. Lu, P. Wang, R. Zhou, R. Ji, M. H. Hong, “Hybrid Metal-insulator-metal Structures on Si Nanowires Array for Surface Enhanced Raman Scattering,” Opto-Electronic Engineering, 44 (2), 185-191 (2017).


 4.     M. X. Wu, R. Chen, J.Z. Ling, Z.C. Chen, X.D. Chen, R. Ji, and M.H. Hong, “Creation of a longitudinally polarized photonic nanojet via an engineered microsphere”, Optics Letters, 42 (7), 1444-1447 (2017).


 5.     K. Xu, C. Zhang, R. Zhou, R. Ji, and M. Hong, “Hybrid micro/nano-structure formation by angular laser texturing of Si surface for surface enhanced Raman scattering,” Optics Express 24(10), 10352-10358 (2016).


 6.     M. X. Wu, R. Chen, J. Soh, Y. Shen, L. Jiao, J. F. Wu, X. D. Chen, R. Ji and M. H. Hong, “Super-focusing of center-covered engineered microsphere”, Scientific Reports,  6:31637, DOI: 10.1038, srep31637, (2016).

 

 Material Characterization and Analysis

 7.     S Liu, Y Yang, R Ji, XT Zeng, WJ Clegg, “AlN/CrN multilayer structures with increased thermal stability”, Scripta Materialia 130, 242-246 (2017)


 8.     S Liu, Y Yang, FL Ng, R Ji, XT Zeng, “Oxidation behaviour of CrAlYN coatings at elevated temperatures”, Surface and Coatings Technology 320, 357-361 (2017).


 9.     R. Ji, Z.X. Xing, Y. S. Ma, J.F. Ying, R. Y. Zheng, H. Q. Xie, X. B. Wang, Angeline Y. X. Tan, C. M. Cho, and J. W. Xu, “Laser irradiation effect on the damage of lubricant films”, Journal of Vacuum Science & Technology B 34, 03H136 (2016).


 10.  J. F. Ying, R. Ji, S. T. Lim, M. N Tran, C. C. Wang and F. Ernult, “Investigating the complex mechanism of B migration in a magnetic-tunnel-junction trilayer structure—a combined study using XPS and TOF-SIMS” J. Phys. D: Appl. Phys. 49, 065004 (2016).


 11.  G. Ye, H. Wang, and R. Ji, "Band alignment of HfO2/AlN heterojunction investigated by X-ray photoelectron spectroscopy," Applied Physics Letters, 108, 162103 (2016).


 12.  H.W. Ho, P.S. Branicio, W. D. Song; K. Bai, Teck L. Tan, R. Ji, Y. Yang, P. Yang; Y. H. Du; M. B. Sullivan, “Unravelling the Anomalous Electrical and Optical Phase-Change Characteristics in FeTe”, Acta Materialia, 112, 67-76 (2016).


 13.  X.B. Wang, Angeline Y. X. Tan, C. M. Cho, Q. Ye, C. B. He, R. Ji, H. Q. Xie, Jack W. H. Tsai and J. W. Xu, “Synthesis and properties of cyclotriphosphazene and perfluoropolyether-based lubricant with polar functional groups”, Lubrication Science, DOI: 10.1002/ls.1347 (2016).


 14.  Z H Cen, B X Xu, J F Hu, R Ji, Y T Toh, K D Ye and Y F Hu, “Temperature effect on titanium nitride nanometer thin film in air”, Journal of Physics D: Applied Physics,  50 (7), 057105 (2016).


 15.  R. Ji, B. X. Xu, Z. H. Cen, J. F. Ying, and Y. T. Toh, “Thermal effects on transducer material for heat assisted magnetic recording Application”, Journal of Applied Physics, 117, 17A918 (2015).


 16.  G. Ye, H. Wang, and R. Ji, “Investigation of band alignment between AlN and atomic-layer-deposited ZrO2 by X-ray photoelectron spectroscopy”, Applied Physics Express 8, 081002 (2015).


 17.  G. Ye, H. Wang, and R. Ji, “Band alignment between 4H-SiC and atomic-layer-deposited ZrO2 determined by X-ray photoelectron”, Applied Physics Express 8, 091302 (2015).


 18.  Z. H. Cen, B. X. Xu, R. Ji, Y. T. Toh, and Y. F. Yu,  “Dark-field scattering spectroscopy to study transducer stability for heat-assisted magnetic recording”, Journal of Applied Physics,117, 17D132 (2015).


 19.  G. Ye, H. Wang, Serene L. G. Ng, R. Ji, S. Arulkumaran, G. I. Ng, Y. Li, Z. H. Liu and K. S. Ang, “Effect of surface pretreatment on interfacial chemical bonding states of atomic layer deposited ZrO2 on AlGaN”, Journal of Vacuum Science & Technology A 33, 05E117 (2015).


 20.  W. D. Song, J. F. Ying, W. He, V. Y.-Q. Zhuo, R. Ji, H. Q. Xie, S. K. Ng, Serene L. G. Ng, and Y. Jiang, “Nano suboxide layer generated in Ta2O5 by Ar+ ion irradiation”, Applied Physics Letters, 106, 031602, (2015).


 21.  X. B. Wang, Angeline Y. X. Tan, C, M. Cho, Q. Ye, C. B. He, R. Ji, H. Q. Xie, Jack W. H. Tsai, J. W. Xu, “Highly thermally stable cyclotriphosphazenebased perfluoropolyether lubricant oil”, Tribology International, 90, 257–262 (2015).


 22.  R. Ji, Y. S. Ma, M. Shakerzadeh, H. L. Seet and J. F. Hu, “Laser irradiation effect on carbon overcoat for HAMR application”, Surface and Interface Analysis,  DOI: 10.1002/sia.5551 (2014).


 23.  J. F. Ying, R. Ji, C. C. Wang, S. T. Lim, H. Q. Xie, and E. F. Gerard, “Observation of TaBxOy  Along the Ta Diffusion Path Through a Boron and Oxygen Containing Tri-layer Structure”, Journal of Materials Engineering and Performance, 23, 2795-2800 (2014).


 24.  Y. S. Ma, Y. J. Man, M. Shakerzadeh, H. L. Seet, R. Ji, R. Y. Zheng, H. J. Chung, X. Y. Chen, J. F. Hu, T. Yamamoto, R. Hempstead, “Laser-Heating-Induced Damage to Ultrathin Carbon Overcoat in Heat-Assisted Magnetic Recording”, Tribology Letters, 53 (1), 303-310 (2014).


 25.  J. F. Hu, J. Z. Shi, T. J. Zhou, K. M. Cher, B. X. Xu, R. Ji, Bo Liu “HAMR Medium Structure Design and Its Process for Excellent Thermal Performance”, IEEE transactions on magnetics, 50 (3), 3201106 (2014).


 26.  H.W. Ho, W.D. Song,  K. Bai,  P.S. Branicio,  Teck L. Tan, R. Ji,  L.T. Law, C.M. Ng,  L. Wang, “Correlation between optical absorption redshift and carrier density in phase change materials”, Journal of Applied Physics, 114 (12), 123504 (2013).


 27.  X. Y. Chen, Y. S. Ma, B. Liu, H.Q. Xie, R. Ji, “Experimental study of lubricant depletion in heat assisted magnetic recording: different lubricants on HAMR media”, Journal of Microsystem Technologies, 19 (9-10), 1581-1586 (2013).


 28.  M. Shakerzadeh, Y. Ma, M. Tadayon, R. Ji, H.S. Tan, B.K. Tay,  “Thickness Dependency of the Structure and Laser Irradiation stability of Filtered Cathodic Vacuum Arc Grown Carbon Films for Heat Assisted Magnetic Recording Overcoat”, Surface and Coatings Technology, 236, 207–211 (2013).


 29.  M. Shakerzadeh, S. N. Piramanayagam, R. Ji, B. Varghese, H. K. Tan, M. Bosman,  "The effect of high deposition energy of carbon overcoats on perpendicular magnetic recording media", Applied Physics Letters, 103 (16), 161604 (2013).


 30.  Y.P Wang, G. C. Han, H. Lu, J. J. Qiu, Q. J. Yap, R. Ji, and K. L. Teo, “Tunnel Magnetoresistance Effect and Interface Studies in Magnetic Tunnel Junctions using Epitaxial Fe2CrSi Heusler Alloy Electrode”, Journal of Applied Physics, 114 (1), 013910 (2013).


 31.  R. Ji, B. X. Xu, R. Y. Zheng, H.Q. Xie, and Jack W. H. Tsai, “The Investigation of High Temperature Lubricants for HAMR Application”, IEEE transactions on Magnetics, 49 (6), 2772-2775 (2013)


 32.  R. Ji, Y. S. Ma, and Jack W. H. Tsai, “Studies of Degradation and Decomposition Mechanisms of High Temperature Lubricants Undergoing Laser Irradiation”, IEEE transactions on Magnetics, 48 (11), 4475-4478 (2012).


 33.  X. T. Fu, W. D. Song, H. W. Ho, R. Ji, L. Wang et al. “Anomalous phase change characteristics in Fe-Te materials”, Applied Physics Letters, 100, 201906 (2012).


 34.  B. X. Xu, Z. J. Liu, R. Ji, Y. T. Toh, J. F. Hu et al., “Thermal issues and their effects on heat-assisted magnetic recording System”, Journal of Applied Physics, 111, 07B701 (2012).


 35.  J. M. Zhao, M. S. Zhang, M. C. Yang, R. Ji, “Ellipsometric measurement accuracy of ultrathin lubricant thickness on magnetic head slider”, Microsyst Technol, 18, 1283-1288 (2012).


 36.  D. Ding, K. Bai, W. D. Song, L. P. Shi, R. Zhao, R. Ji, M. Sullivan, and P. Wu, “Origin of ferromagnetism and the design principle in phase-change magnetic materials”, Physical Review B, 84, 214416 (2011).


 37.  B.X. Xu, H.X. Yuan, S. B. M. Daud, R. Ji, J. Zhang, Q. Zhang, S. N. Piramanyagam, T. C. Chong, “Study of Recorded Mark Change with Laser Power in Heat Assisted Magnetic Recording” Japanese Journal of Applied Physics, 03; 48 (3, Part 2) (2009). 


 38.  R. Ji, T. Liew and T.C. Chong, “TOF-SIMS analysis for thermal effect study of hard disk lubricant”, Applied Surface Science, 55, 1490–1493 (2008). 


 39.  B. X. Xu, H. X. Yuan, J. Zhang, J. P. Yang, R. Ji and T. C. Chong, “Thermal effect on slider flight height in heat assisted magnetic recording”, Journal of Applied Physics, 103, 07F525 (2008).


 40.  B. X. Xu, H. X. Yuan, J. Zhang, R. Ji, Q,D Zhang, X.S. Miao and T. C. Chong, “Characterization of media cross track thermal profile in heat assisted magnetic recording”, Journal of Magnetism and Magnetic Materials, 320, 731-735 (2008).


 41.  J.R. Shi, R. Ji and S.N. Piramanayagam, "Corrosion Performance of Thin Hydrogenated Amorphous Carbon Film Prepared by Magnetron Sputtering", Diamond and Related Materials, 16 (9), 1716-1721 (2007).


 42.  R. Ji, T. Liew and T.C. Chong, “Effect of acrylic acid vapor on lubricated recording hard-disk media surfaces”, Applied Surface Science, 252 (19), 6683-6685 (2006).


 43.  R. Ji, T. Liew and T.C. Chong, “Effect of acrylic acid vapor on head/disk interface”, Journal of Applied Physics, 99, 08N110 (2006).


 44.  J. Zhang, R. Ji, J.W. Xu, J.K.P. Ng, B.X. Xu, S.B. Hu, H.X. Yuan, S.N. Piramanayagam, “Lubrication for Heat-Assisted Magnetic Recording Media”, 42 (10), 2546 – 2548 (2006). 


 45.  B. X. Xu, S. B. Hu, H. X. Yuan, J. Zhang, Y. J. Chen, R. Ji, X. S. Miao, J. S. Chen and T. C. Chong, “Thermal effects of heated magnetic disk on the slider in heat-assisted magnetic recording”,  J. Appl. Phys. 99, 08N102 (2006).


 46.  S. B. Hu, B. X. Xu, H. X. Yuan, Y. J.  Chen, J.  Zhang and R. Ji, “Investigation of temperature rise in GMR sensor and disk induced by laser irradiation”, Journal of Magnetism and Magnetic Materials, 303 (2), e62-e65 (2006).


 47.  B.X. Xu, H.X. Yuan, S.B. Hu, R. Ji, Y.J. Chen, J. Zhang, X.S. Miao, J.S. Chen and T.C. Chong, “Thermal effect on recording quality in heat-assisted recording”, Journal of Magnetism and Magnetic Materials, 303 (2), e34-e38 (2006).


 48.  R. Ji, T. Liew, C.H. Seek and T.C. Chong “Corrosive effect of acrylic acid on magnetic head and media of an operating hard disk drive”, Tribology International, 38 (6-7), 692-698 (2005).


 49.  R. Ji, T. Liew, T.C. Chong, “Quantitative analysis of micro-corrosion on magnetic recording disk using TOF SIMS”; IEEE Transactions on Magnetics, 40 (4),  3192 – 3194 (2004).


 50.  R. Ji, T. Liew and T. C. Chong, “A study of contact-start-stop wear tracks by TOF SIMS”, Tribology International, 36 (12), 883-888 (2003)


 51.  T. Liew, R. Ji, C. H. Seek and T. C. Chong, “Corrosion of magnetic recording heads and media”, Tribology International, 36 (4-6), 447-454 (2003).


 52.  Y. J. Xu, J. Zhang, J. R. Shi, R. Ji and J. P. Wang, “The effect of carbon structure on in-situ protection for granular thin film media”, Tribology International, 36 (4-6), 325-328 (2003).


 53.  D. J. Wu, M. H. Hong, R. Ji, K. D. Ye, S. M. Huang, T. C. Chong, T. C. Ma, Koji Sugioka, and Katsumi Midorikawa, “Laser-induced diffusion for glass metallization”, Proc. SPIE, 5063, 30 (2003).


 54.  Y. J. Xu, J. Zhang, J. R. Shi, R. Ji, and J. P. Wang, "Investigation on corrosion resistance of CoCrPt--C granular thin film media", J. Appl. Phys. 91, 8337-8341 (2002).


 55.  J. Zhang, Y.F. Xu, J.P. Wang, C.K. Pock, R. Ji, T.C. Chong, “Nanoscale protection for CoCrPt thin film magnetic recording media”, IEEE transactions on Magnetics, 37 (4), 1849-1851 (2001).


 56.  T. Liew, R. Ji and G.L. Chen, High Spatial Resolution Chemical Imaging of Tribosurfaces in Magnetic Recording, In Fundamentals of Tribology and Bridging the Gap between the Macro- and Micro/Nanoscales, 869-876 ( 2001).



 New Material Development

 57.  R. Ji,  T.K.L. Dao,   B.X. Xu, J.W. Xu, B.L. Goh, E. Tan, H.Q.  Xie, T. Liew, “Lubricant Pickup under Laser Irradiation”, IEEE Transactions on Magnetics, 47 (7), 1988- 1991(2011).


 58.  R. Ji, J. W. Xu, T. Liew, J. Zhang, H. Q. Xie, B. X. Xu, T. K. L. Dao, “TOF-SIMS analysis of media lubricant under laser irradiation for HAMR application”, Surface and Interface Analysis, 43 (1-2),  406–409 (2011).


 59.  R. JiJ. Zhang   B.X. Xu, T.K.L. Dao, J. W. Xu, T. Liew, “A Study of the Corrosion-Resistant Property of Media Lubricant”,  IEEE Transactions on Magnetics, 45 (11), 5065-5068 (2009).


 60.  J. Zhang, JW. Xu, JKP. Ng, R. Ji, HX. Yuan, BX. Xu, QD. Zhang, GM. He, FY. T, Liew, "New Improvement of Thermal Stability of the Lubricant Film for the Heat Assisted Magnetic Recording Media." J. Magn. Soc. Jpn, 32, 124-129 (2008).



 
Semiconductor Research
 

 61.  S. F. Yoon, R. Ji, J. Ahn, “Preparation of boron and phosphorus-doped SiC:H films using electron cyclotron resonance chemical vapor deposition: some effects of microwave power”, Journal of Materials Research, 14, 29-38 (1999).


 62.  S. F. Yoon, R. Ji, J. Ahn, “Application of electron cyclotron resonance chemical vapour deposition in the preparation of hydrogenated boron doped SiC films”, Philosophical Magazine B, 77 (1), 197-206 (1998).


 63.  R. Ji, S. F. Yoon, J. Ahn and W. I. Milne, “Some effects of phosphorus doping in SiC:H films prepared using ECR-CVD”, Materials Science & Engineering B-Solid State Materials for Advanced Technology, 48 (3), 215-220 (1997).


 64.  S. F. Yoon, R. Ji, “Application of electron cyclotron resonance chemical vapour deposition in the preparation of hydrogenated SiC films: a comparison of phosphorus and boron doping”, Journal of Alloys & Compounds, 261 (1-2), 281-288 (1997).


 65.  S. F. Yoon, R. Ji, J. Ahn, “Preparation of n-type SiC:H using ECR-CVD: Some effects of microcrystalline silicon formation induced by phosphorus doping and microwave power”, Materials Chemistry & Physics, 49 (3), 234-242 (1997).


 66.  S. F. Yoon, R. Ji, J. Ahn and W. I. Milne, “Microwave power dependence of the optical and structural properties of boron and phosphorus-doped SiC:H films prepared using ECR-CVD”, Optical Materials, 8 (4), 287-293 (1997).


 67.  S. F. Yoon, R. Ji, J. Ahn and W. I. Milne, “A Raman and photoconductivity analysis of boron-doped SiC:H films deposited using the electron cyclotron resonance method”, Journal of Materials Science, 32 (5), 1163-1167 (1997).


 68.  S. F. Yoon, R. Ji, J. Ahn and W. I. Milne, “Microwave power effects on the properties of phosphorus-doped SiC:H films prepared using ECR-CVD”, Diamond and Related Materials, Vol.6, No.1, pp 48-54, 1997.


 69.  S. F. Yoon, R. Ji, J. Ahn, “Doping and microwave power effects in the preparation of n-type SiC:H films using ECR-CVD”, Vacuum, 48 (5), 455-462 (1997).


 70.  S. F. Yoon, R. Ji, J. Ahn and W. I. Milne, “Some effects of boron and phosphorus doping on the properties of SiC:H films prepared using electron cyclotron resonance-chemical vapor deposition”, Journal of Vacuum Science & Technology A:Vacuum, Surfaces, and Films,  15 (1), 21-28 (1997).


 71.  S. F. Yoon, R. Ji, J. Ahn, “Some effects of boron doping in a-SiC:H films prepared by the ECR-CVD method, Journal of Non-Crystalline Solids”, 211 (1-2), 173-179 (1997).


 72.  S. F. Yoon, R. Ji, J. Ahn, “Doping and microwave power effects on the properties of a-SiC:H films prepared using ECR-CVD”, Materials Science & Engineering B-Solid State Materials for Advanced Technology, 2, 273-279 (1996).


 73.  S. F. Yoon, R. Ji, J. Ahn, “Influence of boron doping on the properties of amorphous and microcrystalline SiC films prepared using ECR-CVD”, Journal of Electronic Materials, 25 (12), 1845-1850 (1996).


 74.  S. F. Yoon, R. Ji, J. Ahn and W. I. Milne, “The effects of process pressure and microwave power on the properties of boron-doped SiC:H films prepared  using the ECR-CVD technique”, Diamond and Related Materials, 5 (11), 1371-1377 (1996).


 75.  S. F. Yoon, R. Ji, J. Ahn and W. I. Milne, “The effect of microwave power on the deposition of boron-doped a-SiC:H films using the electron cyclotron resonance method”, Thin Solid Films, 288 (1-2),  155-159 (1996).



 
Metal Physics

 76.  C.B. Zhang, Q. Kang, Z.H. Lai, R. Ji, “Micro-structural modification, lattice defects and mechanical properties of hydrogenated /dehydrogenated alpha-Ti”, Acta Materialia, 44 (3), 1077-1084 (1996).


 1.     J. Xu, R. Ji, X. Wang, C. M Cho, A.Y.X. Tan, C. He, H. Xie, J.W.H. Tsai, “Lubricant containing cyclotriphosphazene for magnetic disk, and method of producing a magnetic medium having such lubricant”. (Granted) PCT/SG2013/000337; WO 2014/025317 A1, US9506003B2, 2016.

 

 2.     J. Xu, R. Ji, X. Wang, C. M Cho, A.Y.X. Tan, C. He, H. Xie, J.W.H. Tsai, “Lubricant containing cyclotriphosphzene with a hydrophilic substituent”, Singapore Patent Application No.: 201205893-9, 2012

 

 3.     J.Xu, X. Wang, C. He, J. Zhang, R. Ji, B. Xu, “Fluorinated polyhedral oligomeric silsesquioxanes” US provisional patent application; Application No.: 61/416,618; 2010


 4.     J. Xu, J. Zhang, X. Wang, J.K.P. Ng, R. Ji, B. Xu, S. Hu, “Phosphazene compound, lubricant and magnetic recording medium having such compound, method preparation, and method of lubrication” (Granted) PCT/SG2006/000198; WO2008/008041 A1; JP 2009-542805; US 20090291325A1, 2009

 

 5.     J. Zhang, T. K. Tay, R. Ji, T. Liew, “Method and Apparatus for forming a uniform lubricant film on magnetic hard disk”, Singapore patent application No. 200606695-5; 2006


Last updated on : 23 Apr 2019 03:11 PM