Reducing the residual loss of amorphous nanocrystals can start from material composition optimization, preparation process improvement, magnetic field application optimization, etc. The specific methods are as follows: 

Ⅰ. Material composition optimization 

1. Add specific elements: 

Add some specific elements to the amorphous nanocrystal alloy , such as niobium (Nb), molybdenum (Mo), tungsten (W), etc., can improve the magnetic permeability of the material, reduce the anisotropy of magnetite, thereby reducing the resistance to the movement of the magnetic domain wall and reducing residual losses. For example, adding an appropriate amount of Nb to the Fe-based amorphous nanocrystalline alloy can form a fine and uniform nanocrystalline phase and improve magnetic properties. 

2. Adjust the element ratio: 

Accurately adjust the proportion of each element in the alloy to make the microstructure of the material reach the best state. Taking Co-based amorphous nanocrystals as an example, adjusting the content of elements such as Co, Fe, B can optimize the magnetic properties of the material and reduce residual losses. 

Ⅱ.Improvement of the preparation process 

1. Optimize the rapid solidification process: 

Rapid solidification is the key process for preparing amorphous nanocrystals. Increased cooling speed can make the material form a more uniform and smaller amorphous structure, reduce defects and impurities, and reduce residual losses. If a single-roll quench method is used, the cooling speed can be increased by increasing the roller speed, which can improve material performance. 

2. Accurately control the annealing process: 

Annealing treatment can eliminate stress inside the material and make the nanocrystalline phase more stable and uniform. Accurate control of parameters such as annealing temperature, time and cooling rate is crucial. For example, for FeCuNbSiB-based amorphous nanocrystalline alloys, annealing treatment at an appropriate time at 500-600°C can significantly reduce the residual loss of the material. 

3. Adopt advanced preparation technology: 

Using advanced technologies such as magnetron sputtering and pulsed laser deposition, amorphous nanocrystalline thin film materials with better performance can be prepared. These techniques can accurately control the composition and structure of the material, reduce defects, and thus reduce residual losses.

Ⅲ. Optimization of magnetic field application 

1. Apply a suitable DC bias magnetic field: 

During the use of amorphous nanocrystalline materials, applying an appropriate DC bias magnetic field can make the magnetic domain structure in a more favorable state and reduce the hysteresis phenomenon. Reduce residual loss. For example, in some magnetic sensors, performance is optimized by setting a suitable bias magnetic field. 

2. Optimize the frequency and strength of the magnetic field: 

According to the characteristics of amorphous nanocrystalline materials and specific application scenarios, reasonably select the frequency and strength range of the magnetic field to avoid working in frequency and strength areas with large residual losses. Through experiments and simulations, the optimal magnetic field parameters are determined to reduce residual losses. 

Ⅳ. Surface treatment 

1. Coating protection: 

Coating an insulating coating on the surface of amorphous nanocrystalline materials, such as silica (SiO₂), polyimide, etc., can reduce the eddy current loss on the surface of the material while preventing the material. Contact with the external environment, avoid performance degradation caused by factors such as oxidation, and indirectly reduce residual losses. 

2. Surface polishing: 

Surface polishing of amorphous nanocrystalline materials can reduce surface roughness, reduce surface defects and stress concentration, and make the movement of magnetic domain walls smoother on the surface of the material, thereby reducing residual losses.