title: Tunable negligible-loss energy transfer between dipolar-coupled magnetic disks by stimulated vortex gyration.
abstract: A wide variety of coupled harmonic oscillators exist in nature. Coupling between different oscillators allows for the possibility of mutual energy transfer between them and the information-signal propagation. Low-energy input signals and their transport with negligible energy loss are the key technological factors in the design of information-signal processing devices. Here, utilizing the concept of coupled oscillators, we experimentally demonstrated a robust new mechanism for energy transfer between spatially separated dipolar-coupled magnetic disks - stimulated vortex gyration. Direct experimental evidence was obtained by a state-of-the-art experimental time-resolved soft X-ray microscopy probe. The rate of energy transfer from one disk to the other was deduced from the two normal modes' frequency splitting caused by dipolar interaction. This mechanism provides the advantages of tunable energy transfer rates, low-power input signals and negligible energy loss in the case of negligible intrinsic damping. Coupled vortex-state disks might be implemented in applications for information-signal processing.
authors.affiliation: National Creative Research Center for Spin Dynamics & Spin-Wave Devices, and Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
authors.forename: Hyunsung
authors.initials: H
authors.lastname: Jung
authors.forename: Ki-Suk
authors.initials: KS
authors.lastname: Lee
authors.forename: Dae-Eun
authors.initials: DE
authors.lastname: Jeong
authors.forename: Youn-Seok
authors.initials: YS
authors.lastname: Choi
authors.forename: Young-Sang
authors.initials: YS
authors.lastname: Yu
authors.forename: Dong-Soo
authors.initials: DS
authors.lastname: Han
authors.forename: Andreas
authors.initials: A
authors.lastname: Vogel
authors.forename: Lars
authors.initials: L
authors.lastname: Bocklage
authors.forename: Guido
authors.initials: G
authors.lastname: Meier
authors.forename: Mi-Young
authors.initials: MY
authors.lastname: Im
authors.forename: Peter
authors.initials: P
authors.lastname: Fischer
authors.forename: Sang-Koog
authors.initials: SK
authors.lastname: Kim