I used Stanton for years, never heard that they were moving iron. B&O were the most famous makers and apparently still are.
Bang & Olufsen MMC Phono Cartridges
The B&O MMC cartridge is a sterling example of Bang & Olufsen's pursuit and execution of superior design and engineering. "MMC" stands for Moving Micro-Cross, a design principle that integrated all of the cartridge components - coils, magnet, cantilever, and stylus and which became the patented moving-iron principle upon which all B&O cartridges were based. The MMC moving-iron cartridge is designed to produce the finest groove separation and accurate reproduction of music.
Bang & Olufsen MMC Phono Cartridges
The B&O MMC cartridge is a sterling example of Bang & Olufsen's pursuit and execution of superior design and engineering. "MMC" stands for Moving Micro-Cross, a design principle that integrated all of the cartridge components - coils, magnet, cantilever, and stylus and which became the patented moving-iron principle upon which all B&O cartridges were based. The MMC moving-iron cartridge is designed to produce the finest groove separation and accurate reproduction of music.