All About MnZn Ferrites
To understand what MnZn Ferrites are or what that acronym means, one must first have a basic idea of what ferrites are. Simply put, ferrites are ceramic materials that are a mix of iron oxide, zinc, nickel, manganese and other compounds. Their ability to retain spontaneous magnetisation allows usage in a wide variety of applications.
Ferrites are predominantly divided into Hard & Soft Ferrites.
- Hard Ferrites are tough to magnetise because of their high coercivity, making them ideal to use in appliances like refrigerators, washing machines, and televisions.
- Soft Ferrites have a decent ability to conduct magnetic fields which is useful for developing transformer cores and also in electrical & medical devices.
What are MnZn Ferrites?
Soft ferrites further branch out to others, the most common ones being MnZn (Manganese-Zinc) & NiZn (Nickel-Zinc) ferrites. MnZn ferrites are a type of soft ferrite that carry good electrical & magnetic properties.
They are often preferred over NiZn ferrites because of their higher permeability, magnetisation ability & lower value of resistivity as compared to its counterpart. MnZn ferrites are also low in cost & power losses with high values of magnetic induction that are desirable by power applications, sensors, biomedical applications, inductors etc. Most of their applications rely on their properties of stress insensitivity & adequate working under 2 Mhz.
One can notice multiple benefits of using the MnZn ferrites. Among all these, a few stand out that are often the deciding factor in using these ferrites.
Low Power Loss
Unnecessary power losses can vastly affect the performance of applications that work on constant power. Loss because of hysteresis is an example of this power loss. It happens during the magnetization and demagnetisation of the ferrite and is lost to the environment as heat. These losses build up with continuous use.
MnZn cores keep power losses because of such effects as low as possible, allowing the efficient working of electronic applications.
Low Remanent Magnetisation
Soft ferrites aren’t permanent magnets but they don’t lose magnetisation completely either. In the absence of a magnetic field, their magnetism decreases. In such cases, there is a residue value known as remanent magnetisation.
MnZn ferrites show an increase in value before decreasing and hence offer a low value of remanent magnetisation.
The coercivity of any material is its ability to withstand demagnetisation in an external magnetic field.
MnZn ferrites have low coercivity which means it has low resistance to any change in their magnetisation. This property lets them be readily used in applications where polarity will be often reversed.
Transformer cores change their magnetic field multiple times per second. This is where the MnZn ferrite’s low coercivity & low losses help give satisfactory results. These have the optimal levels of permeability, power loss and saturation magnetisation to be used in switch-mode power supply applications and hence find use in common household appliances like laptops, mobile chargers, LED bulbs, etc.
Apart from these, MnZn ferrites have an extensive range of applications spanning major industries. We at Cosmo Ferrites understood the global need for MnZn ferrites and developed a wide range of products that are highly useful in power conditioning, automotive, solar, lighting and more. Our high-performing ferrite cores help products set a new standard of performance in the global market.
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