Dr. Rajkumar Modak - Publications

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Intellectual property / Patent

1) Patent No. JP7669069B2, "Thermoelectric Body, Thermoelectric Generation Element, Multilayer Thermoelectric Body, Multilayer Thermoelectric Generation Element, Thermoelectric Generator, and Heat Flow Sensor (熱電体、熱電発電素子、多層熱電体、多層熱電発電素子、熱電発電機、及び熱流センサ)", Inventors: Kenichi Uchida, Rajkumar Modak, Yuya Sakuraba, Weinan Zhou, Hossein Sepehri-Amin (International application with same content PCT/JP2022/036432)

2) Patent Application 2025-082293, "Heat flux sensing material, and heat flux sensor using the same (熱流センシング材料、及びこれを用いた熱流センサ)", Inventors: Kenichi Uchida, Rajkumar Modak, Yuya Sakuraba, Weinan Zhou, Hossein Sepehri-Amin

Journal Publications

36) Hiroto Adachi, Fuyuki Ando, Takamasa Hirai, Rajkumar Modak, Matthew Grayson, and Ken-ichi Uchida, Fundamentals and Advances in Transverse Thermoelectrics, Applied Physics Express 18, 090101 (2025). arXiv:2506.12319

35) Sang J. Park, Rajkumar Modak, Ravi Gautam, Abdulkareem Alasli, Takamasa Hirai, Fuyuki Ando, Hosei Nagano, Hossein Sepehri-Amin, and Ken-ichi Uchida, Designing flexible hard magnetic materials for zero-magnetic-field operation of the anomalous Nernst effect, Acta Materialia (2025). (Accepted) arXiv:2412.08853

34) Yebin Lee, Fuyuki Ando, Takamasa Hirai, Rajkumar Modak, Hossen Sepehri-Amin, and Ken-ichi Uchida, Zero-field Hybridization of Anomalous Nernst and Off-diagonal Seebeck Effects in Artificially Tilted Multilayers, Annalen der Physik 537, e00127, (2025).

33) Takamasa Hirai, Toshiaki Morita, Subrata Biswas, Jun Uzuhashi, Takashi Yagi, Yuichiro Yamashita, Varun Kumar Kushwaha, Fuya Makino, Rajkumar Modak, Yuya Sakuraba, Tadakatsu Ohkubo, Rulei Guo, Bin Xu, Junichiro Shiomi, Daichi Chiba, and Ken-ichi Uchida, Nonequilibrium Magnonic thermal transport engineering, Advanced Functional Materials (2025). (Accepted) arXiv:2403.04166

32) A. R. Dilipan, Hossein Sepehri-Amin, Rajkumar Modak, Varun Kumar Kushwaha, Yuya Sakuraba, Ken-ichi Uchida, Kazuhiro Hono, Yukiko Takahashi, Combinatorial Sputtering Synthesis of Tbcu7-Type Sm-Fe Based Compounds: A Study on Phase, Composition, and Extrinsic Magnetic Properties, Journal of Alloys and Compounds 1010, 177723 (2025). SSRN Preprint:4937739

31) Rajkumar Modak, Takamasa Hirai, Yuya Sakuraba, Seiji Mitani, Koichi Oyanagi, Takumi Yamazaki, Takeshi Seki, and Ken-ichi Uchida, High-throughput optimization of magnetoresistance materials based on lock-in thermography, Advanced Physics Research 3, 2400021 (2024).

30) Rajkumar Modak, Takamasa Hirai, Seiji Mitani, and Ken-ichi Uchida, Observation of the Anisotropic Magneto-Thomson Effect, Physical Review Letters 131, 206701 (2023).

29) Rajkumar Modak,Weinan Zhou,Yuya Sakuraba, and Ken-ichi Uchida, Comparison of the in-plane coercive field and anomalous Nernst effect between a co-sputtered Sm-Co amorphous film and Sm/Co multilayer amorphous films with various layer thicknesses, Applied Physics Express 16, 053003 (2023).

28) Hiroto Masuda, Yuta Yamane, Takeshi Seki, Klaus Raab, Takaaki Dohi, Rajkumar Modak, Ken-ichi Uchida, Junichi Ieda, Mathias Kläui, and Koki Takanashi, Magnetization switching process by dual spin-orbit torque in interlayer exchange-coupled systems, Applied Physics Letters 122, 162402 (2023).

27) R. Modak, Y. Sakuraba, T. Hirai, T. Yagi, H. Sepehri-Amin, W. Zhou, H. Masuda, T. Seki, K. Takanashi, T. Ohkubo, and K. Uchida, Sm-Co-based amorphous alloy films for zero-field operation of transverse thermoelectric generation, Science and Technology of Advanced Materials 23,767 (2022). arXiv:2203.10737

26) Naoki Chiba, Satoshi ISHII, Rajkumar Modak, and Ken-ichi Uchida, Single-material-based anomalous Nernst thermopile driven by solar heating and radiative cooling, Applied Physics Express 15, 093001 (2022) Featured as IoP "Spotlights". Selected for 46th JSPS Paper Award (Excellent Paper Award).

25) Ren Nagasawa, Koichi Oyanagi, Takamasa Hirai, Rajkumar Modak, Satoru Kobayashi, Ken-ichi Uchida, Anomalous Ettingshausen effect in iron-carbon alloys, Applied Physics Letters 121, 062401 (2022). arXiv:2206.07322

24) Takumi Yamazaki, Takeshi Seki, Rajkumar Modak, Keita Nakagawara, Takamasa Hirai, Keita Ito,Ken-ichi Uchida,and Koki Takanashi, Thickness dependence of anomalous Hall and Nernst effects in Ni-Fe thin films, Physical Review B 105, 214416 (2022).

23) Hiroto Masuda ,Takeshi Seki ,Yuta Yamane ,Rajkumar Modak ,Ken-ichi Uchida ,Jun’ichi Ieda ,Yong-Chang Lau ,Shunsuke Fukami ,and Koki Takanashi, Large Antisymmetric Interlayer Exchange Coupling Enabling Perpendicular Magnetization Switching by an In-Plane Magnetic Field, Physical Review Applied 17, 054036 (2022).

22) H. Mizuno, R. Modak, T. Hirai, A. Takahagi, Y. Sakuraba,R. Iguchi, and K. Uchida, Deposition temperature dependence of thermo-spin and magneto-thermoelectric conversion in Co2MnGa films on Y3Fe5O12 and Gd3Ga5O12, Applied Physics Letters 120, 202401 (2022). arXiv:2203.10566

21) Rajkumar Modak, Masayuki Murata, Dazhi Hou, Asuka Miura, Ryo Iguchi, Bin Xu, Rulei Guo, Junichiro Shiomi, Yuya Sakuraba, Ken-ichi Uchida,"Phase-transition-induced giant Thomson effect for thermoelectric cooling", Applied Physics Reviews 9, 011414 (2022). Featured. Also featured as a "AIP Scilights" : Thomson effect transforms FeRh-based alloys into thermoelectric materials. (arXiv:2111.02707).

20) Hiroto Masuda, Rajkumar Modak, Takeshi Seki, Ken-ichi Uchida, Yong-Chang Lau, Junsaku Nitta, and Koki Takanashi,"Spin Hall effect in a non-equilibrium Cu76Ir24 alloy measured at various temperatures", AIP Advances 11, 095221 (2021).

19) Rajkumar Modak, A. Srinivasan, V. V. srinivasu, “Understanding low field microwave absorption in Ni-Mn based Heusler alloy films”, Materials Research Bulletin 143, 111453 (2021)

18) T. Hirai, R. Modak, A. Miura, T. Seki , K. Takanashi, and K. Uchida, “Temperature dependence of anisotropic magneto-Seebeck effect in NiPt alloys”, Applied Physics Express 14, 073001 (2021)

17) Jian Wang, Asuka Miura, Rajkumar Modak, Yukiko K. Takahashi, and Ken-ichi Uchida, "Magneto-optical design of anomalous Nernst thermopile", Scientific Reports 11, 11228 (2021).

16) Rajkumar Modak, Kazuki Goto, Shigenori Ueda, Yoshio Miura, Ken-ichi Uchida, Yuya Sakuraba, "Combinatorial tuning of electronic structure and thermoelectric properties in Co2MnAl1-xSix Weyl semimetals", APL Materials 9, 031105 (2021) (arXiv:2102.06412)

15) Hiroto Masuda†, Rajkumar Modak†, Takeshi Seki, Ken-ichi Uchida, Yong Chang Lau, Yuya Sakuraba, Ryo Iguchi, Koki Takanashi, "Large spin-Hall effect in non-equilibrium binary copper alloys beyond the solubility limit", Communications Materials 1, 75 (2020). † equal contribution

14) Rajkumar Modak, Ryo Iguchi, Hossein Sepehri-Amin, Asuka Miura, and and Ken-ichi Uchida, "Simultaneous direct measurements of conventional and inverse magnetocaloric effects in Ni-Mn-based Heusler alloys using lock-in thermography technique", AIP Advances 10, 065005 (2020).

13) Rajkumar Modak and Ken-ichi Uchida, "Enhancement of temperature change induced by anomalous Ettingshausen effect in thin Ni films on suspended membrane substrates", Applied Physics Letters 116, 032403 (2020).

12) A. Gayen, Rajkumar Modak, A. Srinivasan, V.V. Srinivasau, A. Perumal, "Thickness dependent magneto-static and magneto-dynamic properties of CoFeB thin films", Journal of Vacuum Science and Technology A 37, 031513 (2019).

11) Rajkumar Modak and A Srinivasan, "Enhanced room temperature magneto-caloric effect upon Fe/Co substitution in Ni-Mn-In films", Journal of Applied Physics 125, 085302 (2019).

10) Rajkumar Modak, M. Manivel Raja and A Srinivasan, "Enhanced magneto-caloric effect upon fourth element (Cu, Fe, Co) substitution in Ni-Mn-Sn thin films", Applied Physics A 125, 57 (2019).

9) Rajkumar Modak and A Srinivasan, "Enhanced Magneto-static and Magneto-dynamic Properties in Fe/Co Substituted Ni-Mn-In Alloy Films", IEEE Transactions on Magnetics 54, 6100405 (2018).

8) A. Srinivasan, R. Modak, C. Swapna and V. V. Srinivasu, "New aspects of microwave absorption in ferromagnetic Ni-Mn-Sn thin films", Acta Physica Polonica A 134, 178 (2018).

7) Rajkumar Modak, V. V. Srinivasu and A. Srinivasan, "Effect of Cu/Fe/Co substitution on static and dynamic magnetic properties of Ni-Mn-Sn alloy thin films", Journal of Magnetism and Magnetic Materials 464, 50 (2018).

6) Rajkumar Modak, M. Manivel Raja, V.V. Srinivasu and A. Srinivasan, "Structural, magneto-static and magneto-dynamic properties of Fe substituted Ni-Mn-In films", Thin Solid Films 653, 384 (2018).

5) Rajkumar Modak, M. Manivel Raja and A. Srinivasan,"Enhanced magneto-caloric effect upon Co substitution in Ni-Mn-Sn thin films", Journal of Magnetism and Magnetic Materials 448, 146 (2018).

4) Rajkumar Modak, B. Samantaray, P. Mandal and A. Srinivasan, " Thickness dependent structural, magnetic and magneto-dynamic properties of Mn rich Ni-Mn-Sn films ", Journal of Alloys and Compounds 692, 529 (2017).

3) Bhargab Deka, Rajkumar Modak, Pralay Paul and Ananthakrishnan Srinivasan, "Effect of atomic disorder on magnetization and half-metallic character of Cr2CoGa alloy", Journal of Magnetism and Magnetic Materials 418, 107 (2016).

2) Rajkumar Modak, B. Samantaray, P. Mandal and A. Srinivasan, "Low Gilbert damping and in-plane magnetic anisotropy in Ni-Mn-Sn thin film with high L21 order ", Applied Physics A 122, 252 (2016).

1) Rajkumar Modak, B. Deka, M. Manivel Raja and A. Srinivasan, "Significant room temperature magneto-caloric effect in Ni-Mn-Sn thin films", Advanced Science Letters 22, 26 (2016).

Conference proceedings

4) H. Masuda, Y. Yamane, T. Seki, K. Raab, T. Dohi, R. Modak, K. Uchida, J. Ieda, M. Kläui, and K. Takanashi, Current-induced magnetization switching in magnetic multilayers with interlayer exchange coupling by dual spin-orbit torque, 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers).

3) Arnab Kumar Das, Rajkumar Modak and A. Srinivasan, "Structural and optical properties of electrospun MoO3 nanowires", AIP Conference Proceedings 1953, 030021(2018).

2) Rajkumar Modak, B. Samantaray, P. Mandal, V. V. Srinivasu and A. Srinivasan, "Comparison of field swept ferromagnetic resonance methods – A case study using Ni-Mn-Sn films", AIP Conference Proceedings 1953, 120006 (2018).

1) R. Modak, B. Deka, A.K. Singh, A. Gayen, A. Perumal, M. Manivel Raja and A. Srinivasan, "Structural and magnetic properties of Ni-Mn-Sn thin films", AIP Conference Proceedings 1665, 080072 (2015).

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