41. Ferrite magnets are much more resistant to being demagnetized and are thus more robust.42. A ferrite choke was added to prevent RF signals and lightning from triggering the mine. 43. Vector magnetometers are subject to temperature drift and the dimensional instability of the ferrite cores. 44. Sometimes a ferrite core is present also. 45. Batteries require " electrolytic manganese dioxide " while ferrites require " chemical manganese dioxide ". 46. Baluns can be made using ferrite toroid cores or even from the coax feedline itself. 47. This loss heats the ferrite , but normally it is a negligible amount of heat. 48. Surface-mount ferrite beads are available. 49. Correlated magnetic structures can be developed from ferrites , rare-earth materials ( ex. 50. The usual magnetostrictive materials used for the transducer are either ferrite or compressed powdered iron.
