Greetings, I am currently working on an interesting experiment on crystalized metal and I need to find a way to get a detailed map of an electromagnetic field when current is induced into a metal sample. I found the basic 2D approach of using conductivity paper and Ag ink to be useless as it produces very crude results. I am looking for a way to yield more detail with fine lines that will show greater characteristics from my sample. A 3D map would be a good start I would think. I also would think such a fine mapping would be sensitive to environmental fields such as the Earths magnetic field, so I am guessing the experiment will need to be shielded in some way. Does anyone know how I can do this? Sorry I am not a physicist so I am not familiar what is used when they need to do this type of work. Thanks in advance for any suggestions.