Vibrating Sample Magnetometer - Yinchang Ma
By EGEL KAUST
Summary
## Key takeaways - **VSM Measures Magnetization via Faraday's Law**: The sample is polarized near a magnet, then the external field is removed so the material generates its own field. Vibration near a coil creates an alternating field, inducing current by Faraday's law of induction to determine magnetization. [00:22], [01:18] - **Works on Conductors, Semiconductors, Insulators**: The tool helps find various magnetic materials, which can be conductors, semiconductors, or even insulators. They can be elements, chemical compounds, or alloys, either natural or synthesized. [01:35], [01:46] - **Hysteresis Loop Shows Data Stability**: The hysteresis loop can be plotted; the larger the loop, the more stable it will be. This means data can be kept for a long time, for example hundreds of years if the loop is large enough. [02:07], [02:17] - **Susceptibility Classifies Material Types**: Susceptibility describes how large the external field can impact the internal magnetic moment. We can categorize materials into ferromagnetic, paramagnetic, or diamagnetic families. [02:32], [02:42] - **0.5% Error via Superconducting Coils**: The measurement range covers almost all common magnetic materials with error as small as 0.5 percent. This precision comes because it uses a superconducting coil so the signal can be significantly amplified. [02:54], [03:05]
Topics Covered
- VSM Exploits Faraday's Law
- Measures All Magnetic Families
- 0.5% Precision via Superconducting Coils
Full Transcript
okay hello everyone uh today what i'm going to talk about is a type of magnetic property measurement tool
the vibrating sample magnetometer is used to measure the magnetization of the materials it works based on the faraday's law of
induction this slide shows the working principles of this tool firstly the sample is put point
firstly the sample is put near the magnet so the magnetization is polarized inside the material then the external magnetic
field is removed so now the material can generate the magnetic field by itself
next the sample is vibrated near near a coil so there is an alternating magnetic field so from the friday's
law of induction we know clearly that when the magnetic field varies in time it will generate a electric field so the current appears in the coil
and is detected based on the current in the coil we can determine the magnetization of the material [Music] okay
the tool helps us to find the virus magnetic material the material can be either conductors semiconductors or even insulators
they can be elements chemical compound or alloys they can be uh natural or can be synthesis as we all know
the magnetic material is used in the information storage for example the hard disk and the memories
uh the hedgerow uh the high histories loop can be plotted here the larger the loop is the stable it will be
this means uh the data can be kept in a long time for example hundreds years ago if the loop is large enough furthermore the suspensibility can be
also measured does this possibility describe how large the external field can impact the internal magnetic moment so we can
categorize materials into different families ferromagnetic paramagnetic or diamagnetic
the measurement range covers almost all of the common magnetic material the measurement error can be as small as 0.5
percent because it's use a superconducting coil so the signal can be significantly amplified
it's a very precise measurement tool the most well-known manufacturer is the quantum design company the cost is around twenty thousand dollars
so in conclusion it's a powerful tool in the materials research that's all thank you for your attendance
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