Magnetic shielding mechanism and structure design of composites at low frequency: A review

Theoretical Analysis of a Magnetic Shielding System Combining Active and Passive Modes

“…When an external magnetic field is applied to the shielding barrel, the magnetic field lines pass through the high permeability material and do not enter the shielded area, as shown in Figure 1 a. The magnetic field line is a continuous closed curve, which is similar to an electric circuit obeying Kirchhoff’s law [ 15 ], as shown in Figure 1 b, where R m and R 0 are the magnetic resistance of the shielding material and the free space, respectively. The shielding material with higher magnetic permeability shows better shielding efficiency.…”

“… ( a ) Schematic diagram for the principle of passive magnetic shielding [ 15 ]. ( b ) Schematic diagram of magnetic field diversion.…”

Carbon–Ni6Co3Fe1 alloy hybrid foil for electromagnetic wave interference shielding in X-band and extremely low frequencies

“…One such method is to divert the magnetic flux using materials with high magnetic permeability. 22 Because the highly permeable shield has a much lower reluctance than free space, the magnetic field and flux will concentrate within the shield, effectively protecting the region of interest against magnetic field. Ferromagnetic metals such as iron (Fe), nickel (Ni), and cobalt (Co) are representative examples of high permeability materials that can be used for shielding extremely low-frequency EM waves from magnetic field sources, but less effective in shielding high-frequency EM waves.…”

Wide induction range analysis of DC magnetic properties and magnetization processes of Fe-based soft magnetic composites

“…The broad range of use includes various AC and DC applications [6,[9][10][11], mainly electric motors [12], generators, alternators, inductors, sensors, transformers, low-frequency filters, electromagnetic actuation devices, microwave devices and other electromagnetic components, e.g. DC/DC converter reactors especially suited for applications in electric vehicles [13], the in-road inductive power transfer charging systems [14,15], or the magnetic shielding of external magnetic fields meeting today's growing demand for ultra-low magnetic field environments [16]. The most common DC applications can be found in automobiles or as magnetic shielding of static fields [10,11,13,16].…”

“…DC/DC converter reactors especially suited for applications in electric vehicles [13], the in-road inductive power transfer charging systems [14,15], or the magnetic shielding of external magnetic fields meeting today's growing demand for ultra-low magnetic field environments [16]. The most common DC applications can be found in automobiles or as magnetic shielding of static fields [10,11,13,16].…”