Ferrofluid

Domain Detection

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.

product lineup

Catalog
Number		 Carrier Saturation
Magnetization		 Viscosity Typical Appliation
P-0601 Hydrocarbon 10.0 mT 2 mPa·s> Domain detection
P-0801 Water 6.0 mT 5 mPa·s> Domain detection

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.

20μm×20μm pattern

Even the closure domain 20μm×20μm of small pattern is observed easily.