Ⅰ. Magnetic measurement method of amorphous nanocrystalline materials 

1. DC magnetic measurement: 

(1) Principle: By applying a DC magnetic field, the magnetic characteristics parameters of the material under the DC magnetic field, such as magnetization curves, hysteresis loops, etc. 

(2) Instruments: Common ones include DC magnetometers, such as Hall effect magnetometers. Hall effect magnetometer measures magnetic field using the principle that the Hall voltage generated by Hall elements in the magnetic field is proportional to the magnetic field intensity. 

(3) Application: Used to determine the basic magnetic parameters of the material, such as saturation magnetization, residual magnetization, coercive force, etc. For example, when studying the magnetic storage properties of amorphous nanocrystalline materials, DC magnetic measurements can provide critical magnetic indicators. 

2. AC magnetic measurement: 

(1) Principle: 

Apply an AC magnetic field to the material, analyze the magnetic response of the material under the AC magnetic field of different frequencies, and obtain parameters such as AC magnetization curve and magnetic permeability. 

(2) Instruments: 

such as AC hysteresis loop meter. This instrument can accurately control the frequency, amplitude and other parameters of the AC magnetic field and measure the magnetic response signal of the material. 

(3) Application: 

Amorphous nanocrystalline soft magnetic materials are mostly used for magnetic devices that work under dynamic magnetization conditions. AC magnetic measurement can evaluate the performance of the material under AC magnetic fields of different frequencies, and design high-frequency magnetic devices (such as high-frequency transformers, Inductor, etc.) is of great significance. For example, in the field of electronic communication, for high-frequency magnetic components, it is necessary to select suitable amorphous nanocrystalline materials through AC magnetic measurement to meet performance requirements.

Ⅱ. Factors that affect measurement of amorphous nanocrystalline materials 

1. Temperature: 

Temperature changes will affect the magnetic structure and magnetic properties of amorphous nanocrystalline materials. Generally speaking, when the temperature increases, the magnetic properties of the material will weaken. For example, some amorphous nanocrystalline materials may undergo a transition from ferromagnetic to paramagnetic at high temperatures. Therefore, the temperature needs to be strictly controlled during measurement, usually the measurement must be carried out under a constant temperature environment, and the temperature conditions during measurement must be clearly recorded. 

2. Magnetic field strength and frequency: 

The magnetic response of amorphous nanocrystalline materials will be different under different magnetic field strength and frequency. For example, at low magnetic field strength, the material may exhibit linear magnetization characteristics; while at high magnetic field strength, saturation may occur. For AC magnetic measurements, the effect of frequency is also significant, and parameters such as the magnetic permeability of the material may change with frequency. Therefore, when measuring, the appropriate magnetic field strength and frequency range should be selected for measurement based on the application scenario and research purpose of the material. 

3. Sample preparation: 

The sample preparation process (such as the composition, thickness, shape, surface state, etc.) has a great influence on the measurement results. For example, uneven thickness of amorphous nanocrystalline materials may lead to uneven distribution of magnetic fields, thereby affecting measurement results; surface roughness may also affect the interaction of magnetic fields with materials. Therefore, it is necessary to adopt appropriate preparation methods and processes to ensure the quality and consistency of the samples.