[seminar] Seminar na IF-u u ponedjeljak 02.05.2016. u 15:00h - prof. Sadamichi Maekawa (Tokai)

[Damir Staresinic]

Institut za fiziku, Bijenička cesta 46, 

predavaonica u zgradi Mladen Paić ponedjeljak, 2. svibnja 2016., u 15:00 sati 
Prof. A. Einstein meets Spintronics 
prof. Sadamichi Maekawa 
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan 



A. Einstein and W.J. de Haas discovered experimentally the equivalence of magnetic moment and mechanical rotation in 1915 [1]. 
In the same year, S.J. Bernett showed that the mechanical rotation can generate a magnetic field, i.e., the so-called Bernett field, even in a body with no electric charge [2]. 
These phenomena are caused by the angular momentum conservation between electron spin and mechanical rotation, which has been proved in the general relativistic quantum mechanics [3]. 
We introduce mechanical effects in spintronics and propose a variety of novel spintronics phenomena. In particular, the coupling between nuclear spin and mechanical rotation is demonstrated [4]. Since the Bernett field is enhanced more than three orders of magnitudes in nuclei than electron spins, the mechanical nuclear-magnetic-resonance (NMR) may provide new applications of NMR. 
We also observe the generation of spin current by the flow of liquid metals. Combining this effect with the spin Hall effect [5], the spin-hydrodynamic generation of electricity is obtained [6]. 
The mechanical generation of spin and spin current opens a door from “Spintronics” to "Spin-Mechatronics". 



[1] A.Einstein and W.J.de Haas, Verhandl.Deut.Physik.Ges, 17 ,154 (1915). 
[2] S.J.Bernett, Phys. Rev. 6 , 239 (1915). 
[3] M.Matuo, J.Ieda and S.Maekawa, Phys. Rev. Lett. 106 , 076601 (2011). 
[4] H.Chudo,M.Ono, K.Harii, M.Matsuo, J.Ieda, R.Haruki,S.Okayasu, S.Maekawa, H.Yasuoka and E.Saitoh, Appl. Phys. Express 7 , 063004 (2014). 
[5] Spin Current, eds. S. Maekawa et al. (Oxford University Press, 2012). 
[6] R.Takahashi, M.Ono, K.Harii, S.Okayasu, M.Matsuo, J.Ieda, S.Takahashi, S.Maekawa and E.Saitoh, Nature Phys. 12 , 52 (2016). 


Voditelji seminara IF-a: Nataša Vujičić i Damir Starešinić 






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