Seminaria

Seminarium wydziałowe „on-line”

Dnia 2022.12.06 (wtorek) o godzinie 13.15, odbędzie się w seminarium on-line na którym dr Bivas Rana z Instytutu Spintroniki i Informacji Kwantowej, Wydziału Fizyki Uniwersytetu im.Adama Mickiewicza w Poznaniu wygłosi wykład:

„Operation of magnonic devices by voltage-controlled magnetic anisotropy”

Serdecznie zapraszamy

Andrzej Maziewski

Jerzy Przeszowski

Operation of magnonic devices by voltage-controlled magnetic anisotropy
Bivas Rana
Institute of Spintronics and Quantum Information (ISQI), Faculty of Physics, Adam Mickiewicz University, Poznań 61-614, Poland
Laboratory website: http://isik.amu.edu.pl/team/dr-bivas-rana/
Personal homepage: http://bivasrana.weebly.com/

The modern electronic devices rely upon CMOS-FET based technology, where Boolean algebraic operations are performed by CMOS transistor-based logic gates. These logic gates reply upon the flow of electrons (charges) through semiconductors, which consumes considerable amount of energy. To fulfill the growing demand for the smaller, smarter and energetically efficient miniaturized microwave devices, an alternative technology, beyond the present CMOS technology, is urgently required. Although various ideas for non-Boolean logic operations have been proposed, the wave-based i.e. quasiparticle-based information and computation technology are promising to be one of the most potential alternatives.

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 (also known as magnonic devices) must be operated by electric field instead of charge current. The recently 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 seminar 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 magnonic devices. The talk will be based on the following references.

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).
9. B. Rana, Y. Fukuma, K. Miura, H. Takahashi, and Y. Otani, “Effect of excitation power on voltage induced local magnetization dynamics in an ultrathin CoFeB film”, Sci. Rep. 7, 2318 (2017).