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International Affairs Students Current Students Alumni Faculty/Staff Careers--> TOHOKU UNIVERSITYCREATING GLOBAL EXCELLENCE Search 日本語 Contact Tohoku University --> About Facts & Figures Facilities Organization Chart History President's Message Top Global University Project Designated National University Global Network Promotional Videos Academics Undergraduate Graduate Courses in English Exchange Programs Summer Programs Double Degree Programs Academic Calendar Syllabus Admissions Undergraduate Admissions Graduate Admissions Fees and Expenses Financial Aid Research Feature Highlights Research Releases University Research News Research Institutes Visitor Research Center Research Profiles Academic Research Staff Campus Life International Support Office IT Services Facilities Dining & Shops Campus Bus Clubs & Circles News University News Research--> Arts & Culture Health & Sports Campus & Community Press Release--> International Visit Alumni Careers Events Exhibits Music Special Event Lecture Alumni--> Map & Directions Campus Maps & Bus--> Facilities Map--> TOHOKUUNIVERSITY About Academics Admissions Research Campus Life News Events International Affairs Students Current Students Alumni Faculty/Staff Promotional Videos Subscribe to our Newsletter Map & Directions Contact Jobs & Vacancies Emergency Information Site Map 日本語 Close Home Research News Hexagonal Copper Disk Lattice Unleashes Spin Wave Control Research News Hexagonal Copper Disk Lattice Unleashes Spin Wave Control 2024-02-01 A collaborative group of researchers has potentially developed a means of controlling spin waves by creating a hexagonal pattern of copper disks on a magnetic insulator (shown in Figure 1). The breakthrough is expected to lead to greater efficiency and miniaturization of communication devices in fields such as artificial intelligence and automation technology. Details of the study were published in the journal Physical Review Applied on January 30, 2024. In a magnetic material, the spins of electrons are aligned. When these spins undergo coordinated movement, it generates a kind of ripple in the magnetic order, dubbed spin waves. Spin waves generate little heat and offer an abundance of advantages for next-generation devices. An illustration of the two-dimensional magnonic crystal developed in this study, viewed from an oblique angle. Copper disks are periodically arranged on a magnetic garnet film. ©Taichi Goto et al. Implementing spin waves in semiconductor circuits, which conventionally rely on electrical currents, could lessen power consumption and promote high integration. Since spin waves are waves, they tend to propagate in random directions unless controlled by structures and other means. As such, elements capable of generating, propagating, superimposing, and measuring spin waves are being competitively developed worldwide. "We leveraged the wavelike nature of spin waves to successfully control their propagation directly," points out Taichi Goto, associate professor at Tohoku University's Electrical Communication Research Institute, and co-author of the paper. "We did so by first developing an excellent magnetic insulator material called magnetic garnet film, which has low spin wave losses. We then periodically arranged small copper disks with diameters less than 1 mm on this film." By arranging copper disks in a hexagonal pattern resembling snowflakes, Goto and his colleagues could effectively reflect the spin waves. Furthermore, by rotating the magnonic crystal (shown in Figure 2) and changing the incident angle of spin waves, the researchers revealed that the frequency at which the magnonic band gap occurs remains largely unchanged in the range from 10 to 30 degrees. This suggests the potential for the two-dimensional magnonic crystal to freely control the propagation direction of spin waves. Top-view photograph of the fabricated two-dimensional magnonic crystal and the spin wave transmission spectrum at that time. Even when the two-dimensional magnonic crystal is rotated by 5 degrees at a time, it can be seen that the frequency of the magnonic band gap indicated by ▲ remains almost unchanged. This suggests a low angular dependence and the potential for controlling the propagation direction of spin waves. ©Taichi Goto et al. Goto notes the novelty of their findings: "To date, there have been no experimental confirmations of changes in the spin wave incident angle for a two-dimensional magnonic crystal comprising a magnetic insulator and copper disks, making this the world's first report." Looking ahead, the team hopes to demonstrate the direction control of spin waves using two-dimensional magnonic crystals and to develop functional components that utilize this technology. A summary of the results obtained in Figure 2, with the angle of the two-dimensional magnonic crystal on the horizontal axis and the magnonic band gap on the vertical axis. The calculations in (a) and the experiments in (b) are in good agreement, showing a small frequency shift and excellent performance. ©Taichi Goto et al. Publication Details: Title: Orientation-dependent two-dimensional magnonic crystal modes in an ultralow-damping ferrimagnetic waveguide containing repositioned hexagonal lattices of Cu disksAuthors: Kanta Mori, Takumi Koguchi, Toshiaki Watanabe, Yuki Yoshihara, Hibiki Miyashita, Dirk Grundler, Mitsuteru Inoue, Kazushi Ishiyama, Taichi GotoJournal: Physical Review AppliedDOI: 10.1103/PhysRevApplied.21.014061 Contact: Taichi GotoEmail: taichi.goto.a6tohoku.ac.jpWebsite: https://taichigoto.com/ --> Archives 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Page Top About Tohoku University Academics Admissions Research Campus Life News Events International Affairs Students Alumni Promotional Videos Subscribe to our Newsletter Map & Directions Contact Tohoku University Jobs & Vacancies Emergency Information Site Map Privacy Policy Media Enquiries Parent & Family Support Public Facilities Contact Tohoku University