From what I could find, Graphene oxide isn’t magnetic:
https://nanografi.com/blog/60-uses-of-graphene/
https://www.techinstro.com/graphene-oxide-properties-and-applications/
But the graphene is an electrical conductor.
There is iron in the blood that is being affected by CoVID.
Is it the iron in our gene treated blood that attracts a magnet?
That figures.....if Graphene were magnetic it would distort the SEM image.
https://www.graphene-info.com/search/node/graphene%20magnetism
This one's a bonus.