Magnetic domain detection ferrofluid P-series is a developer to observe optically magnetic patterns of all magnetized materials such as Video Tape, Floppy Disc, Hard Disc and magnetic Head etc.
magnetic domain of hard Disc
magnetic domain of thin permalloy film
The magnetic domain of thin permally film of which thickness is 500Å can be observed by a magnetic colloid method and the examples are shown below.
1. 20μm×150μm of rectangular pattern
The fine magnetic domain such as cross-tie wall can be observed clearly under one thousand magnification.
Even the closure domain 20μm×20μm of small pattern is observed easily.