Seminarium ACMiN: All electric field controlled magnonic devices: an alternative of electronics

Akademickie Centrum Materiałów i Nanotechnologii AGH zaprasza na seminarium, które odbędzie się 13 stycznia 2022 r. o godz. 14.00 w formie zdalnej, na platformie UPEL.

Wykład zatytułowany „All electric field controlled magnonic devices: an alternative of electronics” wygłosi dr Bivas Rana (Instytut Spintroniki i Informacji Kwantowej, Wydział Fizyki, Uniwersytet im. Adama Mickiewicza w Poznaniu).

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The modern electronic devices rely upon CMOS-FET based technology, where Boolean algebraic operations are performed by CMOS transistor-based logic gates. The Moore’s law which has guided the electronic industry for last seven decades is going to end soon. This has stimulated research into encoding information in alternate state variables, such as the spin degree of freedom of an electron. This idea gave birth of a new research field called ‘spintronics’. Among various alternative ideas of non-Boolean algebra in spintronics, wave-based or quasiparticle-based information and computation technology has emerged as one of the most promising ideas. In this regard, the spin waves (SWs), i.e., collective precessional dynamics of spins coupled by short range exchange and long range dipolar interaction in ordered magnetic materials has emerged. To further reduce the power consumption, the spin wave devices must be operated by electric field instead of charge current. The newly discovered voltage- (i.e., electric field) controlled magnetic anisotropy, popularly known as VCMA, can serve this purpose. The electric field applied at the interfaces of ultrathin ferromagnetic films and oxide films can modulate interfacial magnetic anisotropy energy. In this talk I will present my research activities to demonstrate how this VCMA can be employed to excite, manipulate, guide spin waves in an efficient manner for the development of all electric field controlled spin wave devices. The talk will be based on the following references.

1. A. Barman, ...., B. Rana et al., “The 2021 Magnonics Roadmap”, J. Phys. Condens. Matter 33, 413001 (2021) 2. S. Choudhury, A. K. Chaurasiya, A. K. Mondal, B. Rana, K. Miura, H. Takahashi, Y. Otani and A. Barman, “Voltage controlled on demand magnonic nanochannels”, Sci. Adv. 6, eaba5457 (2020). 3. B. Rana, C. Akosa, K. Miura, H. Takahashi, G. Tatara and Y. Otani, “Nonlinear control of damping constant by electric field in ultrathin ferromagnetic films”, Phys. Rev. Applied 14, 014037 (2020). 4. B. Rana, K. Miura, H. Takahashi and Y. Otani, “Underlayer material dependent symmetric and asymmetric behavior of voltage-controlled magnetic anisotropy in CoFeB films”, J. Phys. Condens. Matter 32, 414002 (2020). 5. B. Rana, S. Choudhury, K. Miura, H. Takahashi, A. Barman and Y. Otani, “Electric field control of spin waves in ultrathin CoFeB films”, Phys. Rev. B 100, 224412 (2019). 6. B. Rana and Y. Otani, “Towards magnonic devices based on voltage-controlled magnetic anisotropy”, Commun. Phys. 2, 90 (2019).7. B. Rana and Y. Otani, “Voltage-controlled reconfigurable spin wave nanochannels and logic devices”, Phys. Rev. Applied 9, 014033 (2018). 8. B. Rana, Y. Fukuma, K. Miura, H. Takahashi, and Y. Otani, “Excitation of coherent propagating spin waves in ultrathin CoFeB film by voltage-controlled magnetic anisotropy”, Appl. Phys. Lett. 111, 052404 (2017).