| Title: | W kierunku magnoniki wnękowej terahercowej |
| Project leader: | Marcin Białek |
| Laboratory: | Terahertz Laboratory (TeraGaN) (NL-11) |
| Project number: | PAN.BFB.S.BDN.317.022.2022 |
| Implementation date: | 02.08.2022 01.08.2024 |
| Implementing entity: | Institute of High Pressure Physics |
| Total funding granted: | 883 971.48 zł |
| Funding for the entity: | 883 971.48 zł |
| Funding institution: | Europejska Rada do Spraw Badań Naukowych |
Project description
| The research is in the spintronics predominantly concentrates on ferromagnetic materials, which show dynamics in the range of GHz. This is because a resonant frequency of a ferromagnet depends on external magnetic fields, contrary to antiferromagnets, which have dynamics in the THz range due to huge internal exchange fields. Therefore, studies of the THz properties of antiferromagnetic matter, as proposed in the presented TeraMag project, is of a key importance for future spintronics. Moreover, spintronic devices may lead to reduction of the energy losses in a large scale computing systems thanks to absence of Joule heating in a spin current flow. There are very few reports on observations of the strong magnon-photon coupling in the THz range, which is mostly due to difficulty in constructing THz cavities. In his recent work, the applicant has shown strong magnon-photon coupling in a cylindrical metallic cavity at about 0.24 THz. His recent preliminary results, presented in this proposal, show that the strong coupling can be achieved also at about 0.5 THz in a simple structure having a form of a more flexibility in designing experimental setups, in particular, by a Fabry-Perot type cavity. In the initial stage of realization of TeraMag proposal, we would like to show strong magnon-photon coupling Furthermore, the proposed structures could alle at about 1 allow THz and higher fusing THz optical methods and Fabry-Perot cavities. Furthermore, the proposed structures could allow for electrical detection of polariton states. We consider two methods of achieving electrical detection of strongly coupled magnon-photon states at THz frequencies, In the first one, we want to use a typical spintronic method relying on heavy metal layers (typically platinum) that, through inversed spin Hall effect, generate electric current due to spin precession in the magnetic substrate. As the second method in TeraMag project, we propose to use two- dimensional materials, like graphene. If different types of matter waves couple one with another, their hybrid forms acquire new properties. In TeraMag we would like to study the interaction of two different THz excitations magnons and plasmons-that are very rarely investigated together. We propose to place a graphene transistor, hosting plasma resonances on antiferromagnetic substrate hosting magnetic wave modes. Interaction of these two types of waves is expected to result in new modes, allowing tuning spin waves with electric field, like in multiferroics. |