SOFT MAGNETIC MATERIAL

PERMANENT MAGNET

SOFT MAGNETIC MATERIAL

Permanent Magnets

The so-called "Soft" or "Sweet" magnetic materials are those materials that can be easily magnetized and demagnetized. They generally have an intrinsic coercivity of less than 1000 A / m.

They are used in a targeted way to improve and channel the magnetic flux produced by an electric current. The main parameter, often used as a reference for Soft magnetic materials, is relative permeability, which is a measure of how the material responds to an applied magnetic field.

LOW Hc
Coercive Force

A very low value of coercive force means that the material has a high magnetic conductivity: it is therefore easy to magnetize and demagnetize!

LOW SATUREATED
FLUX DENSITY

The material quickly reaches the degree of saturation, this characteristic makes it suitable for applications where a quick change or cancellation of the magnetic field is required.

LOW CURIE
TEMPERATURE

Unfortunately the material demagnetizes at low temperatures, the field of application must be carefully monitored!

WIDE AVAILABILITY
OF DIFFERENT ALLOYS

- Pure iron and low carbon steels
- Fe-Si Alloy
- Amorphous and nanocrystalline alloys
- Ni-Fe and Co-Fe Alloy
- Soft Ferrite

APPLICATIONS

LIST OF MOST DIFFUSED APPLICATIONS

AC Applications

Material will be continuosly cycled from being magnetized in one direction to the other:
  • Power supply transformer
  • DC-DC Converter
  • Electric motors, for making a path for flux in permanent magnetic motors etc.

DC Applications

Material is magnetized in order to perform an operation, e.g.
  • Electromagnet on a crane,
  • Magnetic shielding,
  • Electromagnetic pole-pieces to activate the solenoid switch,
  • Permanent magnet uses this material to make a path for flux lines.

FAQs

TECHNICAL AND OPERATING INFORMATIONS

What are the soft magnetic materials?

Some of the significant soft magnetic materials are the following:
  • Iron
    Pure iron with very low carbon content (> 0.1%). This material can be refined to obtain maximum permeability and very low coercive force with the help of a suitable technique to make it a soft magnetic material. Eddy current loss is also produced when subjected to high flux density due to low resistivity. It is used in low frequency applications such as components for instrument instruments.
  • Iron and silicon alloys
    This material is the most commonly used soft magnetic material. The addition of silicon increases the permeability, generates a low loss of eddy currents due to the increase in resistivity and a low loss of hysteresis. They are used in rotating electrical machines, electromagnets and transformers.
  • Nickel iron alloys
    It is used in communication equipment such as audio transformer, recording heads and magnetic modulators due to the high initial permeability in weak fields. They also possess low hysteresis and eddy current losses. Directed grain sheet: used to make transformation cores. Mu-metal: used in miniature transformers intended for circuit applications. Ceramic Magnets: Used to make memory devices for microwave devices and computers.