Various methods of demagnetization are available for magnetic materials. These include externally applied, decreasing magnetic field, yoke demagnetization, and alternating magnetic field.
Using an alternating magnetic field
Using an alternating magnetic field for demagnetization is a known procedure. The process involves pulling a component through a demagnetization tunnel and then moving it back and forth in an alternating field. The strength of the field determines the power of the process.
The alternating magnetic field is controlled by a control unit. The control unit generates a high field strength.
The field strength is defined by the amplitude and frequency of the alternating magnetic field. The alternating field is then reduced monotonically to zero fields.
The field strength is a critical parameter for demagnetization. The highest field strength will enable reliable and effective demagnetization inside the material.
The effectiveness of the process is also influenced by the distance and frequency of the alternating field. For example, a high frequency will allow more penetration into the material. This is useful when a component has a fine domain structure.
The field strength is also influenced by the coil’s length and opening. The coil’s opening determines the area of the discharge. It is also important to note that the magnetic properties of ferrite magnets are diminished when heat is applied.
Using an externally applied, decreasing magnetic field
Using an externally applied, decreasing magnetic field for demagnetization can provide very efficient and reliable demagnetization of materials. However, there are certain parameters that must be observed and followed to achieve the best results.
Firstly, the component must be moved through the coil evenly and without any irregularities. The component must also be subjected to sufficient vibrations. This is achieved by increasing the distance between the pole plate and the component. This allows better penetration into the material and minimizes eddy current blockages.
Next, the component must be pulled through the demagnetization tunnel. It is also important that the pulse used to move the magnetic field is precise and monotonous. This is achieved by the use of a D-2000 electronics controller.
The coil is normally operated with a mains frequency of 50/60 Hz. This allows for a heat balance of about 80 degC. The heat balance is also regulated by the inductive resistance of the coil.
The coil is enclosed within a mu-metal shield. This shield assembly allows the TSD-1 to be operated in a laboratory environment.
Using a yoke demagnetizer
Using a yoke demagnetizer is a technique to remove the magnetic field of a ferromagnetic component. This process is often used in the field of automatic manufacturing technology and has been successfully applied to AlNiCo magnet systems.
The yoke is usually made of laminated steel and has legs that extend outward from the body of the yoke. These legs are flexible and allow the yoke to focus the magnetic field on the area between the poles. This process is also known as the EM yoke operation.
The yoke demagnetizer creates a less concentrated magnetic flow than the plate demagnetizer. It also uses the field decline function.
The alternating magnetic field is then decreased slowly. The amplitude of the field is determined by the generator control unit. The frequency of the field and the strength of the alternating field are also important factors. The amplitude of the field must be high enough to ensure reliable demagnetization inside the material.
This process can be applied to many types of components, including ferrite magnets, AlNiCo magnet systems, and two-pole ferrite. The magnetic field strength can be adjusted to suit the application. The magnetic field strength is dependent on the cross-sectional area of the component and the coil area.
Random domains in a ferromagnetic material
Several tiny domains are found in ferromagnetic materials, which form due to the exchange interaction. They are formed by a series of parallel magnetic dipole moments that align in alternating directions.
They are typically 0.1 to 1 mm in size. The size of the domains depends on the amount of energy present in the material and the balance between the energies in the material. When the material is magnetically unmagnetized, it has randomly aligned domains. However, the number of domains varies with the grain size and magnitude of the magnetization.
The domain wall has a finite width and it moves in response to the external magnetic field. The domain wall will return to a lower energy configuration when the external field is reduced. Using a Kerr microscope, the domain wall can be observed moving. The domain wall can also be imaged by electron diffraction.
The domain wall moves as a result of the magnetic flow (B field) connected to the external magnetic field. In addition, the domain wall can be pulled free from the pinned state by subjecting the material to a rapidly oscillating magnetic field.
Industrial Demag Equipment
At Industrial Degauss, the process is based on the powerful IDMAG System, and it was engineered to properly demagnetize your equipment and pipelines. The primary system in Industrial Degauss’s degaussing equipment range is the IDMAG System; a demagnetizer that was specifically built to be powerful, portable, and dependable.
It features an easy-to-use interface, a protective case that is water, dust, and crush resistant, a durable and flexible degauss cable, and a digital gaussmeter for simple and accurate measurements.
If you’re ready to properly degauss your components and increase efficiency, contact Industrial Degauss. Demagnetizing services are just a phone call away!