FINEMET
Nanocrystalline Components
In addition to FT-3M and FT-3L series,
three kinds of series are now available.
Improved high frequency characteristics
FT-3K50T
FT-8K50D Improved DC superposed characteristics
FT-3TL Reduced core loss
FINEMET
FINEMET Nanocrystalline Fe-based Soft Magnetic Material with
High Saturation Flux Density, High Relative Permeability and Low Core Loss
What is FINEMET
The precursor of FINEMET is amorphous ribbon non-
crystalline obtained by rapid quenching at one million /
second from the molten metal consisting of Fe, Si, B and
small amounts of Cu and Nb. These crystallized alloys
have grains which are extremely uniform and small, about
ten nanometers in size. Amorphous metals which contain
certain alloy elements show superior soft magnetic
properties through crystallization. It was commonly
known that the characteristics of soft magnetic materials
are larger crystal grains yield better soft magnetic
properties. Contrary to this common belief, soft magnetic
material consisting of a small, nano-order, crystal grains
have excellent soft magnetic properties.
Features
Satisfy both high saturation magnetic fl ux
1. 1.
density and high permeability
High saturation magnetic flux density comparable
to Fe-based amorphous metal. High permeability
2. comparable to Co-based amorphous metal.
2. Low core Loss
1/5th the core loss of Fe-based amorphous metal
and approximately the same core loss as Co-based
3.
amorphous metal.
Low magnetostriction
3.
Less affected by mechanical stress. Very low audio
noise emission.
4.
Excellent temperature characteristics and small
4.
aging effects
Small permeability variation less than 10% at a
temperature range of -50 150 . Unlike Co-based
amorphous metals, aging effects are very small.
5.
Excellent characteristics over wide frequency range
5.
High permeability and low core loss over wide
frequency range, which is equivalent to Co-based
amorphous metal.
6. Flexibility to control magnetic properties B-H
6.
curve shapeduring annealing
Three types of B-H curve squareness, high, middle
and low remanence ratio, corresponding to various
applications
2