Measuring Permanent Magnets Properties with Vibrating Sample Magnetometer

Vibrating Sample Magnetometers (VSMs) are the most commonly employed tool for properties measurement of permanent magnet materials. They can be applied to magnet powder, thin films, anisotropic materials, magnetic recording materials, single crystals and liquid, etc.. They also allow for a broad temperature range from 4 K to 1,273 K in which the measured samples are exposed.

Measuring Permanent Magnets Properties

Measuring Permanent Magnets Properties

Measuring Range

VSMs can easily measure the following parameters of a magnetic material: magnetic moment (m), coercivity (Hci), saturation magnetization (Ms), remanence (Mr), energy product (BHmax), etc..

How Do VSMs Work

When a sample is placed inside a uniform magnetic field (In case of the VSM, it is the suitably placed sensing coils), a magnetic moment will be induced and the sample will undergo sinusoidal motion. During the motion magnetic flux changes will occur and voltage will be resulted in the sensing coils, which is proportional to the magnetic moment of the sample but independent of the strength of the applied magnetic field. In a typical system, the voltage id measured by a lock-in amplifier using the piezoelectric signal as its reference signal. Final measuring result is displayed in a hysteresis curve.

Where can magnets be used?
1. Types of wind turbines.
2. Packaging and packaging industry: cloths, bags, boxes, cartons and so on.
3. Electrical appliances: speakers, earphones, motors, microphones, electric fan, computer, printer, TV and so on.
4. Mechanical control, automation equipment, new energy vehicles.
5. LED lighting.
6. Sensor control,sports equipment.
7. Crafts and aviation fields.
8. Washroom: toilet, bathroom, shower, door, closure, doorbell.
9. Holding pictures and papers, other something to the refrigerator.
10. Holding pins/badges through clothing instead of using pins.
11. Magnetic toys.
12. Jewelry magnetic Accessories.

Anyway, in all life, you can use the magnets, kitchen, bedroom, office, dining room, education.

What is the difference between the different platings and coatings?
Choosing different coatings does not affect the magnetic strength or performance of the magnet, except for our Plastic and Rubber Coated Magnets. The preferred coating is dictated by preference or intended application. More detailed specifications can be found on our Specs page.

Nickel is the most common choice for plating neodymium magnets. It is a triple plating of nickel-copper-nickel. It has a shiny silver finish and has good resistance to corrosion in many applications. It is not waterproof.

Black nickel has a shiny appearance in a charcoal or gunmetal color. A black dye is added to the final nickel plating process of the triple plating of nickel.
NOTE: It does not appear completely black like epoxy coatings. It is also still shiny, much like plain nickel-plated magnets.

Zinc has a dull gray/bluish finish, that is more susceptible to corrosion than nickel. Zinc can leave a black residue on hands and other items.

Epoxy is a plastic coating that is more corrosion-resistant as long as the coating is intact. It is easily scratched. From our experience, it is the least durable of the available coatings.

Gold plating is applied over the top of standard nickel plating. Gold-plated magnets have the same characteristics as nickel-plated ones, but with a gold finish.

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