Published in

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

DOI: 10.1038/srep01301

Links

Tools

Export citation

Search in Google Scholar

Resonant amplification of vortex-core oscillations by coherent magnetic-field pulses

Journal article published in 2013 by Young-Sang Yu, Dong-Soo Han, Myoung-Woo Yoo ORCID, Ki-Suk Lee, Youn-Seok Choi, Hyunsung Jung, Jehyun Lee, 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.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Red circle
Postprint: archiving forbidden
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

Vortex structures in soft magnetic nanodisks are highly attractive due to their scientific beauty and potential technological applications. Here, we experimentally demonstrated the resonant amplification of vortex oscillations by application of simple coherent field pulses tuned to optimal width and time intervals. In order to investigate vortex excitations on the sub-ns time scale, we employed state-of-the-art time-resolved full-field soft X-ray microscopy of 70 ps temporal and 25 nm lateral resolution. We found that, due to the resonant enhancement of the vortex gyration motion, the signal input power can be significantly reduced to ~ 1 Oe in field strength, while increasing signal gains, by increasing the number of the optimal field pulses. We identified the origin of this behavior as the forced resonant amplification of vortex gyration. This work represents an important milestone towards the potential implementation of vortex oscillations in future magnetic vortex devices.