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Nature Research, Scientific Reports, 1(3), 2013

DOI: 10.1038/srep03526

Nature Research, Scientific Reports, 1(1), 2011

DOI: 10.1038/srep00059

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Tunable negligible-loss energy transfer between dipolar-coupled magnetic disks by stimulated vortex gyration

Journal article published in 2011 by Hyunsung Jung, Ki-Suk Lee, Dae-Eun Jeong, Youn-Seok Choi, Young-Sang Yu, Dong-Soo Han, Andreas Vogel, Lars Bocklage, Guido Meier, Mi-Young Im, Peter Fischer ORCID, Sang-Koog Kim
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.