Magnetic Resistance

Seems like you could just get weaker magnets.

I heard lead works well, but I don't think magnetic fields are straight so some will tend to bend around your shield.

Drew

Heat them up & cool them down?

http://en.wikipedia.org/wiki/Curie_temperature

NiZn Ferrite. I am guessing you already know that.

It has been used in a fast-decay pulsed kicker magnet. Is that a part of your design?

It sounds like what you are looking for is called diamagnetic materials. The metal I think you want is Bismuth.

Depending on the application, air, vacuum, distance! (in addition to all materials previously mentioned).

http://cr4.globalspec.com/thread/56606/Why-Energy-From-Magnets-Research-Is-Considered-A-Fraud

Mu-metal is used for magnetic shielding.

My bedroom is very close to power transmission lines, what is best way to protect my self from magnetic field?

Thanks for your care.

What you're dealing with is an electromagnetic field. How strong is it? Have you checked it with a field strength meter? How close are the lines?

The easy answer is, of course, simply move. An effective shield for low frenquency fields looks like a suit of armor, or an iron plated room. . . you get the idea - not too practical.

There's no evidence that low frequency em fields do any harm. After all, think of all the teenagers you see walking about with cell phones next to their brains all day and you don't see . . ., mmm, bad example.

The stray magnetic field from power transmission lines are not very large. This will not be a problem for several reasons. First, the magnetic field magnitude is a function of the current running through each wire. To minimize cable length power losses, the voltage on these power lines are much higher than the voltage running through the walls of your house. With higher voltages less current is moved and therefore less of a magnetic field. Second, the field strength of a magnetic in free space (the condition around a suspended cable) dramatically reduce with distance away from the cable. The relationship is known as the inverse squared law. In simple terms, if we choose to call the magnetic field strength at 1mm away from the cable as 1 then the field strength at 10mm is 1/((1mm/10mm)^2)=0.01. At 1 m the field strength is 1/((1mm/1000mm)^2)=0.000001

Ok,that is about the magnetic field, what about the electric field associated ?

Your skin acts like a Faraday cage and protects the rest of the body from electric fields

Aluminum slightly repels magnetic fields. I'm not sure if that is what you want. You say you don't want shielding, but what else is there?