Do man-made metals have a negative magnetic response?

no Man made magnet is having positive succeptibility

. I think that is not fact

becuse this it depending of this metal 

I think it is true that every human intervention in nature change is considered a kind of pollution.

present a detailed study on the artificial magnetism of high-permittivity dielectric spherical shell array and the negative refraction behavior of the composite consisting of dielectric spherical shells and metal wire lattice. The spherical shell array in cubic lattice arrangement can exhibit an isotropic negative magnetism when excited into magnetic dipole resonance. When the dielectric spherical shell and metal wire lattice are combined in a body-centered cubic structure, full-wave simulations show that the bulk metamaterial with this structure can exhibit a negative refraction behavior. It is shown that artificial magnetic response can originate from differently structured dielectric elements, similarly to the conventional metamaterial constituents based on metal resonance structures.

Yes for Sure,  the answer has many aspect, but i know that the barbed wire of the fence is producing a negative magnetic response

Thanks to Invite me , But I have no knowledge about it . My specialization is Education, Management and Monitoring and Evaluation. Ask me any question in these sectors.

I'm currently working on a geophysics report, with a particular focus on a magnetics survey I did over an old mine site. From its location and other data I've pulled together, I know that the barbed wire of the fence is producing a negative magnetic response, instead of the positive that I was expecting.