Which category of materials conducts magnetic lines of force properly, including aluminum and platinum?

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Magnetic response is described by magnetic susceptibility, which classifies materials as paramagnetic, diamagnetic, ferromagnetic, or superparamagnetic. In a paramagnetic material, unpaired electrons create magnetic moments that tend to align with an external field, allowing magnetic lines of force to pass through and giving a small, positive permeability. Aluminum and platinum both have positive, small magnetic susceptibility, so they are attracted to a magnetic field and behave as paramagnets. Ferromagnetic materials show strong, permanent magnetization and attract lines much more intensely, which isn’t the case here. Diamagnetic materials have negative susceptibility and repel the field, pushing lines away, not through; superparamagnetic behavior applies to nanoscale particles and isn’t characteristic of these bulk metals. Therefore, aluminum and platinum are best described as paramagnetic.