Hi, I want to heat magnetic nanoparticles in an AC magnetic field. I need a uniform and a magnetic field about 15- 25 mT ) . I have thought about some designs, can you tell me which one is the most suitable design for creating a uniform alternating magnetic field? I need this system for magnetic hyperthermia experiments. (A cancer cure using magnetic nanoparticles) http://www.nanoprobes.com/ This link explains it in a simple way. If anyone is interested in, I am glad to talk with them in detail.