Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 4a: MPI Part 6 & Part 7
In most atoms, electrons occur in…
Chapter 4a: MPI Part 6 & Part 7
- In most atoms, electrons occur in pairs (electrons in pair spin in opposite direction)
- When electrons are paired together, their opposite spin will cause their magnetic field to cancel to each other.
- Therefore, no net magnetic field exists. Alternately, materials with some unpaired electrons will have a net magnetic field & will react more to external field.
Part 6
Diamagnetic materials
-
2) Diamagnetic materials are slightly repelled by a magnetic field and the materials does not retained the magnetic properties,
3) In diamagnetic materials, all the electron are paired so there is no permanent net magnetic moment per atom
4) Diamagnetic properties arise from the realignment of electron path under the influence of external magnetic field
5) Most elements in the periodic table, including copper, silver and gold are diamagnetic
Part 7
Paramagnetic materials
-
2) These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed.
3) Paramagnetic properties are presence some unpaired electrons from the re-alignment of the electron path caused by the external magnetic field
4) Paramagnetic materials include magnesium, aluminium, lithium and titanium
Ferromagnetic materials
-
2) They exhibit a strong attraction to magnetic fields and are able to retain magnetic properties after external field has been removed
3) Ferromagnetic materials ha some unpaired electrons, so their atoms have a net magnetic moment
4) They get their strong magnetic properties because of magnetic domain. In these domains:
- Large number of atoms moment (10 ^12 to 10^30)
- Aligned parallel --> the magnetic force within the domain strong
5) When a ferromagnetic material is in the unmagnetized state, the domains are nearly randomly organized.
-The net magnetic field = 0
6) When a magnetizing force is applied, the domains become aligned which produce a strong magnetic field within the components
7) Example: Iron, Nickel, cobalt