CORE FACULTY

Education
• PhD in Nanoengineering for Integrated Systems, 2014, Indian Institute of Science, Bengaluru, India
• MTech in Nano Science and Technology, 2006, Jadavpur University, Kolkata, India
• BTech in Instrumentation Engineering, 2002, Haldia Institute of Technology, Haldia, India

Experience
• Visiting Professor (Feb. 2018 – Now) at Indian Institute of Science, Bengaluru, India
• Assistant Professor (Apr. 2014 – Nov. 2017) at Tohoku University, Sendai, Japan
• Postdoctoral Fellow (Nov. 2013 – Mar. 2014) at Tohoku University, Sendai, Japan
• Lecturer (Jun. 2006 – Jul. 2007) at Haldia Institute of Technology, Haldia, India
• Asst. Engineer (Jul. 2003 – Jul. 2004) National Integrated Systems, Kolkata, India

Research Interests
• Functional oxide thin film
• Microwave-assisted chemical bath deposition
• High-frequency properties of materials
• Microwave and millimetre-wave devices
• On-chip inductors and transformers
• Gas- and bio-sensing elements

Research Area
5G EMI/EMC, High Frequency Magnetics, IoT Sensor Nodes, Power SoC/SiP, Thin Oxide Film Technology

Publications
• R.D. Ralandinliu Kahmei, Sarath Arackal, S. A. Shivashankar, Navakanta Bhat, and Ranajit Sai, “The impact of solvent tanδ on the magnetic characteristics of nanostructured NiZn-ferrite film deposited by microwave-assisted solvothermal technique”, AIP Advances, 11, 2, pp. 025003, (2021).

• S. Yabukami, K. Nozawa, L. Tonthat, K. Okita, and Ranajit Sai, “Impact of complex permeability measurements up to millimetre-wave frequency range”, IEEE Transaction of Magnetics, 57, 2, pp. 9149663, (2020).

• R. D. R. Kahmei, Ranajit Sai, S. Arackal, S. A. Shivashankar, and N. Bhat, “Nanostructured Zn-substituted Nickel Ferrite thin film: CMOS compatible deposition and excellent soft magnetic properties”, IEEE Magnetics Letters, 10, pp. 2941427, (2019).

• Ranajit Sai, M. Sato, Y. Miyazawa, A. Takahashi, and M. Yamaguchi, “Electromagnetic noise suppression composite sheets made of hexagonal particles”, IEEE Transaction of Magnetics, 54, 11, pp. 2849020, (2018).

• Ranajit Sai, M. Yamaguchi, S. A. Shivashankar, and N. Bhat, “Magnetic nanoferrites for RF CMOS: Enabling 5G and beyond”, ECS Interfaces (Invited article), 26, 4, pp. 71, (2017).

• Ranajit Sai, S. D. Kulkarni, M. Yamaguchi, N. Bhat, and S. A. Shivashankar, “An integrated X-band inductor with nano-ferrite-film core”, IEEE Magnetics Letters, 8, pp. 7826968, (2017).

• Ranajit Sai, Y. Endo, Y. Shimada, M. Yamaguchi, and S. A. Shivashankar, “Oriented nanometric aggregates of partially inverted zinc ferrite: One-step processing and tunable high-frequency magnetic properties”, Journal of Applied Physics, 117, 17, pp. 17E511, (2015).

• P. L. Venugopalan, Ranajit Sai, Y. Chandorkar, B. Basu, S. A. Shivashankar, and A. Ghosh, “Conformal cytocompatible ferrite coatings facilitate the realization of a nano-voyager in human blood”, Nano Letters, 14, 4, pp. 1968, (2014).

• Ranajit Sai, K. J. Vinoy, N. Bhat, and S. A. Shivashankar, “CMOS-compatible and scalable deposition of nanocrystalline zinc ferrite thin film to improve inductance density of integrated RF inductor”, IEEE Transactions on Magnetics, 49, 7, pp. 4323, (2013).

• Ranajit Sai, S. D. Kulkarni, K. J. Vinoy, N. Bhat, and S. A. Shivashankar, “ZnFe2O4: Rapid and sub-100 °C preparation and anneal tuned magnetic properties”, Journal of Materials Chemistry, 22, 5, pp. 2149, (2012)

Patents
• Ranajit Sai, K. J. Vinoy, N. Bhat, and S. A. Shivashankar, “High frequency integrated device with an enhanced inductance and a process thereof”, Patentee: Indian Institute of Science (IISc), Bengaluru, India; US Patent No. 9741656 (2017); Indian Patent No. 369720 (2013).

• Ranajit Sai, S. A. Shivashankar, and Manish Hooda, “A microwave-assisted device, system, and method for deposition of thin films and coatings”, International Patent Appl. No. PCT/IN/2020/050923 (2020), Publication No. WO/2021/084561 (2021).

• Neha Sakhuja, Ravindra Jha, Ranajit Sai, and N. Bhat, “A chemiresistive gas sensor and a method of fabrication thereof”, Applications filed for Indian (No. 202041034329) and US patents (2020).

• Ranajit Sai, S. A. Shivashankar, Sarath Arackal, Manish Hooda, and Navakanta Bhat “Nanocrystalline spinel-type compounds with local non-cubic spinel structures and process thereof”, Indian Patent Application (Provisional) No. 202141044607 (2021).

Conference and Seminars
• Ranajit Sai, S. Arackal, RDR Kahmei, N. Bhat, M. Yamaguchi, S. A. Shivashankar, “Crystallographic inversion mediated superparamagnetic relaxation in Zn-ferrite nanocrystals”, 64th Annual conference on Magnetism and Magnetic Materials (MMM-2019), (Paper ID: HH-08), Las Vegas, USA, 8th Nov. 2019.

• Ranajit Sai, and M. Yamaguchi, “High-Q on-chip C-band inductor with a nanocrystalline MnZn-ferrite film core”, 12th Joint MMM/Intermag, (Paper ID: FD-06), Washington, DC, USA, 17th Jan. 2019.

• M. Yamaguchi, Y. Miyazawa, J. Ma, M. Sato, A. Takahashi, S. Tanaka, Ranajit Sai, and M. Nagata, “Magnetic Powder Composite Noise Suppressor to Improve Receiver Sensitivity”, International Symposium and Exhibition on Electromagnetic Compatibility (EMC Europe 2018), Amsterdam, Nederland, 27th Aug. 2018.

• Ranajit Sai, M. Sato, Y. Miyazawa, A. Takahashi, and M. Yamaguchi, “Hexaferrite Composite Sheet to be Embedded in IC Chip for SHF-Range Noise Suppression”, The 5th International Conf. of Asian Union of Magnetics Societies (Invited, IcAUMS 2018), (Paper ID: G7-1241), Jeju, Korea, 3rd June 2018.

• M. Yamaguchi, T. Yanai, H. Nakayama, Ranajit Sai, H. Fujiwara, Y. Kitai, and U. Sangawa, “Skin Effect Suppressed Ni-Fe/Cu Electroplated Multilayer Wiring for High Data-Rate and Low Delay-Time I/O Interface Board”, IEEE International conference on Magnetics (Intermag 2018), (Paper ID: CE-06), Singapore, 25th Apr. 2018.

• Ranajit Sai, M. Yamaguchi, N. Bhat, and S. A. Shivashankar, “On-chip electromagnetic noise suppression up to 30 GHz by composite spinel ferrite thick film”, 62nd Annual conference on Magnetism and Magnetic Materials (MMM-2017), (Paper ID: CI-12), Pittsburgh, USA, 8th Nov. 2017.

• Ranajit Sai, M. Sato, S. A. Shivashankar, and M. Yamaguchi, “RF IC chip level noise suppressor against power electronic noise injection for near-future telecommunication systems”, Moscow International Symp. on Magnetism (Invited, MISM-2017), (Paper ID: 2TL-H-4), Moscow, Russia, 2nd July 2017.

• Ranajit Sai, M. Yamaguchi, N. Bhat, and S. A. Shivashankar, “On-chip ferrite-core inductor with highest inductance density for the X-band”, 61st Annual conference on Magnetism and Magnetic Materials (MMM-2016), (Paper ID: GF-08), New Orleans, USA, 4th Nov. 2016.

• Ranajit Sai, Y. Endo, Y. Shimada, M. Yamaguchi, and S. A. Shivashankar, “Oriented nanometric aggregates of partially inverted zinc ferrite: One-step processing and tunable high-frequency magnetic properties”, 59th Annual Conference on Magnetism and Magnetic Materials (MMM-2014), (Paper ID: FG-12), Honolulu, Hawaii, USA, 4th Nov. 2014.

• Ranajit Sai, K. J. Vinoy, N. Bhat, and S. A. Shivashankar, “CMOS-compatible and scalable deposition of nanocrystalline zinc ferrite thin film to improve inductance density of integrated RF inductor”, 12th Joint MMM/Intermag Conference, (Paper ID: GG-01), Chicago, Illinois, USA, 18th Jan. 2013.