Nano-Cylinder-Based Static Magnetic Field Concentrator with Positive Permeability

Sensitivity is a critical feature for magnetometry in most practical applications, such as magnetic anomaly or Debye magnetic field detection. Over the past few decades, significant efforts have been dedicated to exploring new detection mechanisms to improve magnetic field measurement precision. This paper proposes a concentrator utilizing nano-scale cylinder structures to enhance the focusing of static magnetic fields. The design of the magnetic concentrator is based on the distribution variation of magnetic flux density resulting from materials with relative permeability different from the surrounding medium. In transmission mode, the magnetic field intensity can be increased by up to 60%. By employing the proposed concentrator as an amplitude mask, the intensity of the magnetic field collected by a magnetometer can be increased by up to 60% in transmission mode. Additionally, other enhancement techniques can be utilized to harness the focused and intensified magnetic field, thereby improving the collection efficiency of a typical magnetometer.