Antimagnets: Controlling magnetic fields with superconductor-metamaterial hybrids

Abstract

Magnetism is very important in science and technology, from magnetic recording to energy generation to trapping cold atoms. Physicists have managed to master magnetism - to create and manipulate magnetic fields- almost at will. Surprisingly, there is at least one property which until now has been elusive: how to 'switch off' the magnetic interaction of a magnetic material with existing magnetic fields without modifying them. Here we introduce the antimagnet, a design to conceal the magnetic response of a given volume from its exterior, without altering the external magnetic fields, somehow analogous to the recent theoretical proposals for cloaking electromagnetic waves with metamaterials. However, different from these devices requiring extreme material properties, our device is feasible and needs only two kinds of available materials: superconductors and isotropic magnetic materials. Antimagnets may have applications in magnetic-based medical techniques such as MRI or in reducing the magnetic signature of vessels or planes.

14 pages, 4 figures

References in corpus (4)

• Design of Electromagnetic Cloaks and Concentrators Using Form-Invariant Coordinate Transformations of Maxwell's Equations
• Macroscopic Invisibility Cloaking of Visible Light
• A DC magnetic metamaterial
• Alternative Derivation of Electromagnetic Cloaks and Concentrators

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• Finite-element simulations of hysteretic ac losses in a magnetically coated superconducting tubular wire subject to an oscillating transverse magnetic field
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• Critical State Theory For The Magnetic Coupling Between Soft Ferromagnetic Materials And Type-II Superconductors
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• Circumventing Magnetic Reciprocity: a Diode for Magnetic Fields
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• Coexistence of Van Hove Singularities and Pseudomagnetic Fields in Modulated Graphene Bilayer
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• Optimization Approach in Axisymmetric Problems of Manipulating DC Currents