Static magnetic field concentration and enhancement using magnetic materials with positive permeability

TL;DR

This paper introduces a novel static magnetic field compressor based on transformation optics that enhances magnetic fields in free space, with potential applications in magnetic particle control and delivery.

Contribution

The paper presents a new magnetic field compressor using finite embedded transformation optics with positive permeability materials, not requiring a closed structure.

Findings

Effective magnetic field compression demonstrated through simulations

Enhanced static magnetic fields achieved behind the device

Device can be constructed with existing materials or DC meta-materials

Abstract

In this paper a novel compressor for static magnetic fields is proposed based on finite embedded transformation optics. When the DC magnetic field passes through the designed device, the magnetic field can be compressed inside the device. After it passes through the device, one can obtain an enhanced static magnetic field behind the output surface of the device (in a free space region). We can also combine our compressor with some other structures to get a higher static magnetic field enhancement in a free space region. In contrast with other devices based on transformation optics for enhancing static magnetic fields, our device is not a closed structure and thus has some special applications (e.g., for controlling magnetic nano-particles for gene and drag delivery). The designed compressor can be constructed by using currently available materials or DC meta-materials with positive permeability. Numerical simulation verifies good performance of our device.