Electromagnetic properties control of high frequency magnetic nanomaterials and their applications in magnetic electronic devices

It is well known that the microminiaturization and electromagnetic interference (EMI) of magneto-electronic devices are bottleneck problems for the development of electronic information technology with higher working frequency and higher degree of integration. In order to solve these problems, this project, based on the fabrication of magnetic nanomaterials and their nanostructure, is aimed at 1) exploring new mechanism to improve the high frequency magnetic properties (HFMP) which will be beyond the Snoek’s limit, finding a solution to simultaneously increase resonance frequency and high frequency permeability, and providing physical basis for the development of new generation of electronic information technology; 2) exploring new mechanism to adjust HFMP and dielectric properties of magnetic nanomaterials which will be beyond the continuum media theory, overcoming the impedance match of magnetic metal nanomaterials in high frequency range, achieving microminiaturized thin film inductor with high-performance and low loss, fabricating anti-EMI device with thin function layer, broadband and efficient near field anti-EMI, providing application support for dual-use products in the range of 1-5 GHz.

The research details include four aspects.
1) Magnetization dynamics within the frame of nature magnetization resonance. Developing an approach to manipulate the bi-anisotropy of magnetic nanomaterials in a large range, obtaining magnetic materials with the resonance frequency in the range of 1 to 5 GHz and the high frequency permeability larger than 200 at the same time, realizing an intrinsic high frequency parameter which is 5 to 10 times higher than that of the Snoek limit.
2) Magnetization dynamics within the frame of non-uniform magnetization resonance. Exploring technologies to massively fabricate monodisperse magnetic nanoparticles with controllable shape and size, realizing a cut-off frequency as high as 5 GHz for a regular pattern of magnetic nanoparticles in a large area.
3) Transmission of electromagnetic waves in the nano-coupled medium, exploring several core/shell coupled magnetic/dielectric nanomaterials, clarifying the high frequency electromagnetic properties in magnetic/dielectric coupled medium, developing new anti-EMI materials with better performance than that of traditional anti-EMI materials, and controlling the electromagnetic impedance match of those materials in a wide range between 1 to 5 GHz at the same time.
4) Approach to describe the transmission of electromagnetic wave in discontinuous mediums, designing and fabricating thin film inductor with high frequency inductance (1 to 5 GHz) between 30 to 120 nH with peak values of quality factor 18 to 30, designing and fabricating near-field anti-EMI devices with noise suppression properties as high as 30 dB, realizing a microminiaturized near field anti-EMI thin film inductors with area diminished by one order.

The research team is constituted by domestic institutes which have rich experiences in both theories and experiments and form their special characteristics in high frequency nanomaterials. With combining with young and senior scientists who are from comprehensive disciplines and knowledge structure, a group of young and creative scientists become the backbone of the research team. The projects are focus on four topics:
1) HFMP of magnetic thin film with biaxial anisotropy;
2) HFMP of monodisperse magnetic nanoparticles;
3) high frequency electromagnetic properties of magnetic/ dielectric nanomaterials;
4) thin film inductor and near field anti-EMI device based on the high frequency magnetic materials.