Fig. 2

The gradient MF generation device for the in vivo experiment in rats. a The MF generating device composed of four circular neodymium magnets. b Each two circular magnets form a group, with a 15 mm gap between the two groups. Rats were placed inside circular magnets to expose the sciatic nerve to a gradient MF. c There is a large MF gradient inside the circular neodymium magnets. The maximum gradient value appears in the gap between the two groups of circular magnets. d A gradient MF of 16.0 T/m is generated in the MF generator