Reprogrammable magnonic metamaterials

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Speaker: Prof. Adekunle Adeyeye
Affiliation: Departament of Physics, Durham University, Durham, UK

Information processing based on nanomagnetic networks is an emerging area of spintronics as the energy consumption and integration density of the current semiconductor technology is reaching its fundamental limit. Magnonic based devices promise to usher in an era of low power computing where information is carried by the precession of the electrons’ spin instead of dissipative translation of their charge. In the last few years, interest in magnonics has grown largely due to advances in nanotechnology which allows shapes of geometrically confined magnonic elements to be fabricated, the development of new advanced experimental techniques for studying high-frequency magnetization dynamics and the potential use of spin waves as information carriers in spintronic applications.

The first part of this talk will focus on design and fabrication strategies for synthesizing reprogrammable magnonic structures and nanomagnetic networks with deterministic magnetic ground states. Reliable reconfiguration between ferromagnetic, antiferromagnetic and ferrimagnetic ground magnetic states will be shown in rhomboid nanomagnets which stabilize to unique ground states upon field initialized along their short axis. In the second part, a novel waveguide consisting of dipolar coupled rhombic shaped nanomagnetic chain that eliminate the requirement of a stand-by power during operation will be presented. It will be shown that our waveguide could be used to send spin wave signal around a corner without any stand-by power. In our design, gating operation is demonstrated by switching the magnetization of single/multiple nanomagnets in the waveguides in order to manipulate the spin wave amplitude at the output. We observed a significant reduction of spin wave amplitude by switching the nanomagnets using microwave current through a coplanar waveguide.

Seminar language: English
Chairman: Prof. Jarosław W. Kłos

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