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Ferromagnetism help please?
"The strong, permanent magnetism seen in iron objects is called ferromagnetism and is due to the cooperative alignment of electron spins in many iron atoms. Paramagnetism is a much weaker effect. Nevertheless, paramagnetic substances can be attracted to a strong magnet. Liquid oxygen is composed of paramagnetic O2 molecules. When poured over a magnet, the liquid clings to the poles. "
I don't understand what they mean by 'cooperative alignment of electron spins ' ?
1 Answer
- Andrew SmithLv 71 year ago
Just imagine that an electron was orbiting in a circle. Current in a circle creates a magnetic field like a bar magnet. If all of these are pointing in different directions the result is zero. But if they line up with each other (cooperative) then each field adds to each other field giving a strong field.
