title: Logic operations based on magnetic-vortex-state networks.
abstract: Logic operations based on coupled magnetic vortices were experimentally demonstrated. We utilized a simple chain structure consisting of three physically separated but dipolar-coupled vortex-state Permalloy disks as well as two electrodes for application of the logical inputs. We directly monitored the vortex gyrations in the middle disk, as the logical output, by time-resolved full-field soft X-ray microscopy measurements. By manipulating the relative polarization configurations of both end disks, two different logic operations are programmable: the XOR operation for the parallel polarization and the OR operation for the antiparallel polarization. This work paves the way for new-type programmable logic gates based on the coupled vortex-gyration dynamics achievable in vortex-state networks. The advantages are as follows: a low-power input signal by means of resonant vortex excitation, low-energy dissipation during signal transportation by selection of low-damping materials, and a simple patterned-array structure.
authors.affiliation: National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, and Research Institute of Advanced Materials, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
authors.forename: Hyunsung
authors.initials: H
authors.lastname: Jung
authors.forename: Youn-Seok
authors.initials: YS
authors.lastname: Choi
authors.forename: Ki-Suk
authors.initials: KS
authors.lastname: Lee
authors.forename: Dong-Soo
authors.initials: DS
authors.lastname: Han
authors.forename: Young-Sang
authors.initials: YS
authors.lastname: Yu
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