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[post_content] => Abstract: Spin current, which represents a flow of angular momentum, has garnered significant attention for its role in magnetization manipulation within spintronic devices. Several established methods are used to generate spin current, including nonlocal spin injection,[1],[2] spin pumping,[3],[4] spin Hall effect (SHE) and Rashba–Edelstein effect.[5]-[6] The spin transfer torque (STT) induced by spin current has become a key mechanism in the development of STT-based magnetic random access memory (MRAM), which holds promise as a replacement for conventional memory technologies such as DRAM. More recently, spin–orbit torque (SOT)—a form of STT mediated by the SHE—has attracted growing interest, driven by both the pursuit of deeper understanding of the underlying physics and the potential for technological breakthroughs in next-generation magnetic memory and logic devices.[7]-[9] In this seminar, I will present the fundamental mechanisms and experimental techniques related to spin current generation, STT, SHE, and SOT, highlighting their implications for future spintronic applications.
References:
[1] Y. Fukuma, L. Wang, H. Idzuchi, S. Takahashi, S. Maekawa, Y. Otani, Nature Materials, 10, 527(2011).
[2] K. Fujiwara, Y. Fukuma, J. Matsuno, H. Idzuchi, Y. Niimi, Y. Otani, H. Takagi, Nature Communications, 4, 2893(2013).
[3] S. Gupta, R. Medwal, D. Kodama, K. Kondou, Y. Otani, Y. Fukuma, Applied Physics Letters, 110, 22404(2017).
[4] R. Medwal, S. Gupta, R. S. Rawat, A. Subramanian, Y. Fukuma, Physica Status Solidi-Rapid Research Letters, 1900267 (2019).
[5] K. Kondou, R. Yoshimi, A. Tsukazaki, Y. Fukuma, J. Matsuno, K. S. Takahashi, M. Kawasaki, Y. Tokura, Y. Otani, Nature Physics, 12, 527(2016).
[6] U. Shashank, R. Medwal, Y. Nakamura, J. R. Mohan, R. Nongjai, K. Asokan, R. S. Rawat, H. Asada, S. Gupta, Y. Fukuma, Advanced Quantum Technologies, 4, 2000112(2021).
[7] U. Shashank, T. Tomoda, A. J. Mathew, G. Vashisht, K. Imai, Y. Kusaba, C.-L. Dong, C.-L. Chen, Y. Horibe, M. Ishimaru, H. Awano, H. Asada, Y. Fukuma, NPG Asia Materials, 17, 15 (2025).
[8] A. J. Mathew, J. R. Mohan, C. Yamanaka, K. Shintaku, M. Mohammadi, H. Awano, H. Asada, Y. Fukuma, Applied Physics Letters, 126, 082405 (2025).
[9] K. Shintaku, A. J. Mathew, A. Iwamoto, M. Mohammadi, H. Awano, H. Asada, Y. Fukuma, Applied Physics Letters, 127, 012410 (2025).
About the Speaker: Prof. Yasuhiro Fukuma received his PhD in Material Science from Yamaguchi University (Japan) in 2002. After research positions at Yamaguchi Prefectural Industrial Technology Institute (Japan), University of Alabama (USA), RIKEN (Japan), he jointed at Kyushu Institute of Technology in 2012. He has been working on spintronic technology for the last 29 years, and published over 100 peer-reviewed journal papers and holds 7 patents. His main project is recently related to spin Hall effect and its memory and neuromorphic computing applications.
We look forward to you active participation.
[post_title] => Physics Colloquium
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[post_content] => Abstract: I shall tell you in a nutshell, in a nontechnical fashion, and from a historical perspective, about the development of a few fundamental concepts of physics over the last century, and how they led to the prediction of the Higgs boson -- the so called 'God Particle' -- which was eventually discovered in 2012 at the CERN LHC.
About the Speaker: Prof. Gautam Bhattacharyya is the Former Director of Saha Institute of Nuclear Physics, Kolkata. He is a particle phenomenologist and his research is Phenomenology of the Standard Model and beyond (e.g., Supersymmetry, Extra Dimensions, Composite Higgs, GUT); Neutrino and Flavor Physics and their interplay with Collider results. Prof. Bhattacharyya is J.C. Bose National Fellowship, SERB-DST, Govt. of India (2017-22), Fellow of the Indian Academy of Sciences (IASc), Bangalore (2015), Fellow of the Indian National Science Academy (INSA), New Delhi (2013) and Allahabad (2013), and many other accolades.
We look forward to your active participation.
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[post_content] => Abstract: Spin current, which represents a flow of angular momentum, has garnered significant attention for its role in magnetization manipulation within spintronic devices. Several established methods are used to generate spin current, including nonlocal spin injection,[1],[2] spin pumping,[3],[4] spin Hall effect (SHE) and Rashba–Edelstein effect.[5]-[6] The spin transfer torque (STT) induced by spin current has become a key mechanism in the development of STT-based magnetic random access memory (MRAM), which holds promise as a replacement for conventional memory technologies such as DRAM. More recently, spin–orbit torque (SOT)—a form of STT mediated by the SHE—has attracted growing interest, driven by both the pursuit of deeper understanding of the underlying physics and the potential for technological breakthroughs in next-generation magnetic memory and logic devices.[7]-[9] In this seminar, I will present the fundamental mechanisms and experimental techniques related to spin current generation, STT, SHE, and SOT, highlighting their implications for future spintronic applications.
References:
[1] Y. Fukuma, L. Wang, H. Idzuchi, S. Takahashi, S. Maekawa, Y. Otani, Nature Materials, 10, 527(2011).
[2] K. Fujiwara, Y. Fukuma, J. Matsuno, H. Idzuchi, Y. Niimi, Y. Otani, H. Takagi, Nature Communications, 4, 2893(2013).
[3] S. Gupta, R. Medwal, D. Kodama, K. Kondou, Y. Otani, Y. Fukuma, Applied Physics Letters, 110, 22404(2017).
[4] R. Medwal, S. Gupta, R. S. Rawat, A. Subramanian, Y. Fukuma, Physica Status Solidi-Rapid Research Letters, 1900267 (2019).
[5] K. Kondou, R. Yoshimi, A. Tsukazaki, Y. Fukuma, J. Matsuno, K. S. Takahashi, M. Kawasaki, Y. Tokura, Y. Otani, Nature Physics, 12, 527(2016).
[6] U. Shashank, R. Medwal, Y. Nakamura, J. R. Mohan, R. Nongjai, K. Asokan, R. S. Rawat, H. Asada, S. Gupta, Y. Fukuma, Advanced Quantum Technologies, 4, 2000112(2021).
[7] U. Shashank, T. Tomoda, A. J. Mathew, G. Vashisht, K. Imai, Y. Kusaba, C.-L. Dong, C.-L. Chen, Y. Horibe, M. Ishimaru, H. Awano, H. Asada, Y. Fukuma, NPG Asia Materials, 17, 15 (2025).
[8] A. J. Mathew, J. R. Mohan, C. Yamanaka, K. Shintaku, M. Mohammadi, H. Awano, H. Asada, Y. Fukuma, Applied Physics Letters, 126, 082405 (2025).
[9] K. Shintaku, A. J. Mathew, A. Iwamoto, M. Mohammadi, H. Awano, H. Asada, Y. Fukuma, Applied Physics Letters, 127, 012410 (2025).
About the Speaker: Prof. Yasuhiro Fukuma received his PhD in Material Science from Yamaguchi University (Japan) in 2002. After research positions at Yamaguchi Prefectural Industrial Technology Institute (Japan), University of Alabama (USA), RIKEN (Japan), he jointed at Kyushu Institute of Technology in 2012. He has been working on spintronic technology for the last 29 years, and published over 100 peer-reviewed journal papers and holds 7 patents. His main project is recently related to spin Hall effect and its memory and neuromorphic computing applications.
We look forward to you active participation.
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