I am curious about the how size of a sample influences magnetisation of a material. For example if I have a series of rods of increasing thickness in a magnetic field in air, the thicker rods will be less magnetised than the thinner rods due to there being more material in the sample in the same strength field?
How are magnetisation curves measured in regard to sample size? I am aware that the coercivity will move depending on the size of the material, is this also the case for magnetisation saturation?
I am also wondering about time scale for magnetisation. If I could create an oscillating magnetic field in the hundreds of megahertz, is there a limit to how quickly the magnetisation within the sample could be switched?
Thank you for any help. David