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FLAT (F) LOOP

Flat (F) loops are characterized by a central range of constant slope combined with low remanence induction BR(Example nanocrystalline F materials: BR/BM = 3 … 10 %). The resulting µ(H) - curve is characterized by a constant permeability level over a wide H - range, limited by saturation related drop. Depending on the material and manufacturing technology, permeability can be varied between less than 10 and more than 200,000 can be set.

F-loop

Application:
Wherever low-distortion transmission or increased DC tolerance is required or where unipolar pulses have to be transformed.

Examples: storage chokes, common mode chokes, power transformers, pulse transformers, signal transformers with DC tolerance, pulse current sensitive fault current transformers, instrument transformers, audio transformers.

Manufacturing process:
Magnetic shear using an air gap or by powder cores provides permeability up to several hundreds.

Higher permeability can be reached by annealing in a magnetic field perpendicular to the ribbon axis. In consequence uniaxial anisotropy Ku is induced perpendicular to the ribbon and with this perpendicular to the driving field H.

Magnetization process:
The magnetic easy axis transverse to the tape leads to a highly symmetrical structure of transverse domains. Under the influence of a magnetic field H the magnetization vector rotates out of the direction of the easy axis into that of the tape. This results in linear increase of the component of B parallel to H.

Magnetization process with anisotropy perpendicular to ribbon axis.

Last update: 02.07.2012

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