Recent Progress in the Preparation Technologies for Micro Metal Coils

Abstract

The recent development of micro-fabrication technologies has provided new methods for researchers to design and fabricate micro metal coils, which will allow the coils to be smaller, lighter, and have higher performance than traditional coils. As functional components of electromagnetic equipment, micro metal coils are widely used in micro-transformers, solenoid valves, relays, electromagnetic energy collection systems, and flexible wearable devices. Due to the high integration of components and the requirements of miniaturization, the preparation of micro metal coils has received increasing levels of attention. This paper discusses the typical structural types of micro metal coils, which are mainly divided into planar coils and three-dimensional coils, and the characteristics of the different structures of coils. The specific preparation materials are also summarized, which provides a reference for the preparation process of micro metal coils, including the macro-fabrication method, MEMS (Micro-Electro-Mechanical System) processing technology, the printing process, and other manufacturing technologies. Finally, perspectives on the remaining challenges and open opportunities are provided to help with future research, the development of the Internet of Things (IoTs), and engineering applications.

Passive array micro-magnetic stimulation device based on multi-carrier wireless flexible control for magnetic neuromodulation

“…For implantable micromagnetic devices with more reliable biosafety, there are no exposed pads or circuits at the front of the stimulus and the micro-coils do not require secondary insulation. In addition, the fabrication process of a micro-coil array needs to be further researched and explored using the latest advances in microcoil preparation technology and the implementation process studied by Lou et al [32]. Li et al used an inkjet printing scheme to produce carbon-based The experimental data totaled 14 SD rats, of which seven were in the control group and seven were in the experimental group; to minimize the error, four groups of data were selected for statistical analysis from the resulting data, and it was ensured that the four groups of data were obtained from different rats to exclude the individual variability.…”