I. Magnetic measurement method of amorphous nanocrystalline materials

1. DC magnetic measurement:

(1) Principle:

By applying a DC magnetic field, the magnetic property parameters of materials under a DC magnetic field are measured, such as magnetization curves, hysteresis loops, etc.

(2) Instrument:

Common ones include DC magnetometers, such as Hall effect magnetometers. The Hall effect magnetometer uses the principle that the Hall voltage generated by the Hall element in the magnetic field is proportional to the magnetic field strength to measure the magnetic field.

(3)Application:

Used to determine the basic magnetic parameters of materials, 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 key magnetic indicators.

2. AC magnetic measurement:

(1) Principle:

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

(2) Instrument:

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 in magnetic devices working under dynamic magnetization conditions. AC magnetic measurement can evaluate the performance of materials under AC magnetic fields of different frequencies, which is important for the design of high-frequency magnetic devices (such as high-frequency transformers, inductors, etc.) significance. For example, in the field of electronic communications, for magnetic components operating at high frequencies, AC magnetic measurements are needed to select appropriate amorphous nanocrystalline materials to meet performance requirements.

II. Factors affecting measurement of amorphous nanocrystalline materials

1. Temperature:

Temperature changes can affect the magnetic structure and magnetic properties of amorphous nanocrystalline materials. Generally speaking, as the temperature increases, the magnetism of the material will weaken. For example, some amorphous nanocrystalline materials may undergo a transition from ferromagnetism to paramagnetism at high temperatures. Therefore, the temperature needs to be strictly controlled during measurement, usually in a constant temperature environment, and the temperature conditions during measurement must be clearly recorded.

2. Magnetic field strength and frequency:

Under different magnetic field strengths and frequencies, the magnetic response of amorphous nanocrystalline materials will be different. For example, at low magnetic field strengths, a material may exhibit linear magnetization properties; at high magnetic field strengths, 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, it is necessary to select the appropriate magnetic field strength and frequency range for measurement based on the application scenario and research purpose of the material.

3. Sample preparation:

The sample preparation process (such as material composition, thickness, shape, surface state, etc.) has a great impact on the measurement results. For example, uneven thickness of amorphous nanocrystalline materials may lead to uneven magnetic field distribution, thereby affecting measurement results; surface roughness may also affect the interaction between the magnetic field and the material. Therefore, appropriate preparation methods and processes need to be adopted to ensure sample quality and consistency.