Ferrites are polycrystalline oxides manufactured by ceramic technology and belong to a class of materials that exhibit the technically useful property of ferromagnetism. In a ferromagnetic material, magnetism occurs under the influence of an externally applied field. Upon removal of this field, the material returns to its non-magnetic state. This behaviour is referred to as being magnetically ‘soft’.
The general composition of these soft ferrites is MeFe2O4, where Me represents one or several of the divalent transition metals such as manganese (Mn), zinc (Zn), nickel (Ni), copper (Cu), iron (Fe) or magnesium (Mg), the most popular being manganese-zinc (Mn-Zn) and nickel-zinc (Ni-Zn) ferrites. These compounds exhibit good magnetic properties below a certain temperature, called the Curie temperature (TC).
These materials can be used up to very high frequencies without laminating. Ni-Zn ferrites have a very high receptivity and are most suitable for frequencies over 1 MHz, whereas Mn-Zn ferrites exhibit higher permeability and saturation induction levels and are suitable up to 3 MHz.
Cosmo Ferrites produces a wide range of soft ferrites in a multitude of shapes and sizes to serve applications such as:
• Lighting – electronic ballasts for energy efficient lamps (CFL, LED), or electronic chokes for tubular lamps.
• Power conditioning – UPS/inverter transformers, welding transformers, switch mode power supplies, medical electronics, telecom power supplies, induction heating.
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