Breakthrough for efficient, high-speed spintronic devices

So far, studies on the subject have relied heavily on large, limited-access X-ray facilities such as free-electron lasers and synchrotrons. The team demonstrates, for the first time, a tabletop ultrafast soft X-ray microscope to spatiotemporally resolve spin dynamics inside rare-earth materials, which hold promise for spintronic devices.

This new soft X-ray source based on a high-energy Ytterbium laser represents a critical advance for the study of future high-energy, high-speed spintronic devices and could be used for many applications in physics, chemistry and biology.

“Our approach provides an elegant, robust, cost-effective, and energy-scalable solution for many labs. It allows the study of ultrafast dynamics in nanoscale and mesoscale structures with nanoscale spatial and femtosecond temporal resolutions, as well as with element specificity. says the teacher Andrius Baltuskaat TU Vienna.

X-ray light pulses to observe rotation

With this bright source of X-ray photons, a series of snapshot images of rare-earth magnetic structures at the nanoscale were recorded. They clearly exhibit the rapid degaussing process and the results provide rich magnetic property information that is as accurate as that obtained using large-scale X-ray facilities.

“The development of ultrafast benchtop X-ray sources is exciting for advanced technology applications and modern scientific fields. We are excited about our results, which could be useful for future research in spintronics, as well as other potential fields,” says INRS postdoctoral researcher Dr. Guangyu fan.

“Rare-earth systems are trending in the community due to their nanoscale size, faster speed, and topologically protected stability. The X-ray source is very attractive for many studies of future compound spintronic devices. of rare earths.” said Nicolas Jaouenresearch director at the French national synchrotron centre.

Professor Légaré emphasizes collaborative work between experts in the development of state-of-the-art light sources and ultrafast dynamics in magnetic materials at the nanoscale. “Given the rapid emergence of high-power Ytterbium laser technology, this work represents enormous potential for high-performance soft X-ray sources. This next generation of lasers, which will soon be available at the Advanced Laser Light Source (ALLS), will have many future applications for the fields of physics, chemistry and even biology,” he says.

About the study

The article “Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source” by G. Fan, K. Légaré, V. Cardin, X. Xie, R. Safaei, E. Kaksis, G. Andriukaitis , A. Pugžlys, BE Schmidt, JP Wolf, M. Hehn, G. Malinowski, B. Vodungbo, E. Jal, J. Lüning, N. Jaouen, G. Giovannetti, F. Calegari, Z. Tao, A. Baltuška , F. Légaré, and T. Balčiūnas, was published in the journal Optica on April 6, 2022. The study received financial support from the Natural Sciences and Engineering Research Council of Canada, the Quebec Research Fund – Nature and Technologies (FRQNT) and PRIMA Quebec, among others. The ALLS laboratory also benefits from an investment from the Canada Foundation for Innovation (CFI).

About INRS

INRS is a university dedicated exclusively to research and training at the university level. Since its creation in 1969, INRS has played an active role in the economic, social and cultural development of Quebec and ranks first for the intensity of research in Quebec. INRS is made up of four interdisciplinary research and training centers in Quebec, Montreal, Lavaland Varennes, with expertise in strategic sectors: Water Land Environment, Energy Materials Telecommunications, Urbanization Culture Society and Armand-Frappier Health Biotechnology. The INRS community includes more than 1,500 students, postdoctoral fellows, faculty members and staff.

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SOURCE National Institute for Scientific Research (INRS)

For further information: Audrey-Maude Vézina, INRS Communications and Public Affairs Department, 418 254-2156, [email protected]

James C. Tibbs