Magnetisation: Making Magnets (HSC SSCE Physics): Flashcards
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Magnetisation
Magnetisation
Process of making a material magnetic
Permanent magnet
Permanent magnet
Maintains magnetic field after being magnetised
Domains in ferromagnets
Domains in ferromagnets
Tiny regions where electron fields are aligned
Un-magnetised ferromagnet domains
Un-magnetised ferromagnet domains
Point in random directions, cancel out
Domain alignment during magnetisation
Domain alignment during magnetisation
Aligned domains grow, un-aligned shrink
Saturation magnetisation
Saturation magnetisation
All unpaired electrons aligned with external field
Residual magnetisation
Residual magnetisation
Magnetisation retained after external field removed
Temperature effect on magnetisation
Temperature effect on magnetisation
Higher temp = more random = lower magnetisation
How permanent magnets are made
How permanent magnets are made
Material placed in solenoid with large magnetic field
Fridge magnets feel rippled because
Fridge magnets feel rippled because
Alternating N-S domains attract and repel