Vibrating Sample Magnetometer (VSM)

The vibrating sample magnetometer (VSM) is mainly composed of an electromagnet system, a sample forced vibration system and a signal detection system. It is one of the important means to measure the magnetic properties of materials. It is widely used in the study of magnetic properties of various ferromagnetic, ferrimagnetic, antiferromagnetic, paramagnetic and diamagnetic materials. It includes magnetic research on rare earth permanent magnet materials, ferrite materials, amorphous and quasicrystalline materials, superconducting materials, alloys, compounds and biological proteins. It can complete the measurement of hysteresis loop, initial magnetization curve, demagnetization curve and temperature characteristic curve, isothermal remanence curve and DC remanence curve. It has the characteristics of simple, fast and friendly interface.

Sample Requirements

• The block is generally smaller than 3 × 3 × 3 mm.
• The film is smaller than 4 × 5 × 1 mm.
• The amount of powder is about 10 mg, at least 1 mg, please weigh it in advance before testing.
• For liquid samples, please contact the staff to confirm whether they can be tested.

Application

• For the study of magnetic properties of various ferromagnetic, ferrimagnetic, antiferromagnetic, paramagnetic and diamagnetic materials
• For detecting the intrinsic magnetic properties of various substances, such as magnetization Ms (σs), Curie temperature Tf, coercive force mHc, remanence Mr, etc.

Instrument and Result Display

FAQ

Q1. What is the main difference between SQUID and VSM?

A. The test accuracy of SQUID is higher than that of VSM, and the test time is 20 times that of VSM, but VSM is cheaper than SQUID.

Q2. What are the main applicable objects of SQUID and VSM?

A. SQUID is suitable for almost all magnetic samples, but it is mostly used to test thin films or weak magnetic samples with weak signals; VSM is suitable for bulk or powder samples with strong signals, and the test effect of thin films with VSM is poor.

Q3. How to deal with the slope of the M-H high field curve?

A. The inclination of the high field part of the M-H curve is caused by the detection of a low back signal. The specific method of deduction: high-field linear fitting, the slope is the anti-magnetic susceptibility, which is a negative value K, and the y value is subtracted from K*x to get a new y, which is equal.

Q4. If you want to know the magnetic strength of the sample, which data should you look at?

A. 1. Permanent magnet materials: saturation magnetization, coercive force, and magnetic energy product (obtainable through the hysteresis loop).

2. Soft magnetic materials: Saturation magnetization and low coercive force (hysteresis loop should be slender).

The magnitude of magnetism can be judged by calculating the magnetic moment on the vertical axis. If the magnetization intensity is large, it is generally considered that the magnetism is strong.

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