Approaching soft X-ray wavelengths in nanomagnet-based microwave technology

• Published in: Nature communications 2016-04, Vol.7 (1), p.11255-11255, Article 11255
• Main Authors: Yu, Haiming, d’ Allivy Kelly, O., Cros, V., Bernard, R., Bortolotti, P., Anane, A., Brandl, F., Heimbach, F., Grundler, D.
• Format: Article
• Language: English
• Subjects: 142/126; 639/301/119/997; 639/766/400/1106; 639/925/357; Humanities and Social Sciences; multidisciplinary; Science; Science (multidisciplinary)
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/ncomms11255

Seven decades after the discovery of collective spin excitations in microwave-irradiated ferromagnets, there has been a rebirth of magnonics. However, magnetic nanodevices will enable smart GHz-to-THz devices at low power consumption only, if such spin waves (magnons) are generated and manipulated on the sub-100 nm scale. Here we show how magnons with a wavelength of a few 10 nm are exploited by combining the functionality of insulating yttrium iron garnet and nanodisks from different ferromagnets. We demonstrate magnonic devices at wavelengths of 88 nm written/read by conventional coplanar waveguides. Our microwave-to-magnon transducers are reconfigurable and thereby provide additional functionalities. The results pave the way for a multi-functional GHz technology with unprecedented miniaturization exploiting nanoscale wavelengths that are otherwise relevant for soft X-rays. Nanomagnonics integrated with broadband microwave circuitry offer applications that are wide ranging, from nanoscale microwave components to nonlinear data processing, image reconstruction and wave-based logic. Integrating spin waves with microwave circuits is promising for microwave nanoelectronics. Here, Yu et al . demonstrate a reconfigurable microwave-to-magnon transducer by covering yttrium iron garnet with small arrays of tailored magnetic nanodisks, which transmits microwave signals via sub-100-nanometer wavelength spin waves.