G
G. K. Perkins
Researcher at Imperial College London
Publications - 99
Citations - 2820
G. K. Perkins is an academic researcher from Imperial College London. The author has contributed to research in topics: Superconductivity & Magnetization. The author has an hindex of 25, co-authored 98 publications receiving 2714 citations. Previous affiliations of G. K. Perkins include Katholieke Universiteit Leuven.
Papers
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Journal ArticleDOI
Direct observation of magnetic monopole defects in an artificial spin-ice system
TL;DR: In this article, the authors show direct images of kagome monopole defects and the flow of magnetic charge using magnetic force microscopy using a cobalt honeycomb nanostructure.
Journal ArticleDOI
Enhancement of the high-magnetic-field critical current density of superconducting MgB2 by proton irradiation.
Y. Bugoslavsky,Lesley F. Cohen,G. K. Perkins,Massimiliano Polichetti,Massimiliano Polichetti,T.J. Tate,Russell M. Gwilliam,A D Caplin +7 more
TL;DR: In this paper, it was shown that modest levels of atomic disorder induced by proton irradiation enhance the pinning of vortices, thereby significantly increasing the critical current density at high field strengths.
Journal ArticleDOI
Enhancement of the high-field critical current density of superconducting MgB2 by proton irradiation
Y. Bugoslavsky,L. F. Cohen,G. K. Perkins,Massimiliano Polichetti,T.J. Tate,Russell M. Gwilliam,A.D. Caplin +6 more
TL;DR: It is shown that modest levels of atomic disorder induced by proton irradiation enhance the pinning of vortices, thereby significantly increasing Jc at high field strengths, and it is anticipated that either chemical doping or mechanical processing should generate similar levels of disorder, and so achieve performance that is technologically attractive in an economically viable way.
Journal ArticleDOI
Vortex dynamics in superconducting MgB2 and prospects for applications.
TL;DR: The results show that naturally occurring grain boundaries are highly transparent to supercurrents, a desirable property which contrasts with the behaviour of the high-temperature superconductors.
Journal ArticleDOI
A d.c. magnetic metamaterial
Fridrik Magnus,B. Wood,J.J. Moore,Kelly Morrison,G. K. Perkins,J. Fyson,M. C. K. Wiltshire,David Caplin,Lesley F. Cohen,John B. Pendry +9 more
TL;DR: The first experimental realization of a non-resonant metamaterial designed to operate at zero frequency is presented, and the corresponding effective permeability is calculated, which agrees well with theoretical predictions.