Knowledge Base
Insights, expert advice, and industry-leading information to fuel your understanding
Our permanent magnets and magnet assemblies are designed to meet the unique needs of your application. Therefore, as a valued customer, you are assured of quality products, timely service and competitive pricing. Here is a self-serve repository of information pertaining to our magnetic products.
H
Hard Magnetic Material
A "permanent" magnet material that has an intrinsic coercivity greater than or equal to about 300 Oersteds (24 kA/m).
Hardness
A measure of the resistance of a material to surface indentation or abrasion.
Heat Staking
This is when a polymer is heated to a temperature where it exhibits plastic behaviour and then is deformed to form a fastener. This powerful and repeatable technique is one we use with greater frequency at Goudsmit UK.
Helmholtz Coil
This is a quick way to measure the differences between magnets. It consists of two electromagnets on the same axis. A Helmholtz coil is a device for producing a region of nearly uniform magnetic field. Besides creating magnetic fields, Helmholtz coils are also used in scientific apparatus to cancel external magnetic fields, such as the Earth's magnetic field.
Hysteresis in Ferromagnetic Materials
Hysteresis refers to the irreversibility of the magnetisation and demagnetisation process of a material. A study of the hysteresis loop of ferromagnetic materials shows the relationship between the degree of magnetisation (B) and the strength of the magnetic field (H). Naturally, there is no magnetisation without a magnetic field.