Hysteresis

HysteresisMagnetic hysteresis of a ferromagnetic is lagging alteration of magnetization in relation to alteration of external magnetic field. Magnetic permeability of ferromagnetic materials is not a constant value, it strongly depends on the induction of the external field. Variable permeability leads to a complex nonlinear dependence of the magnetic field induction in the ferromagnetic on the induction of the external magnetic field. A characteristic feature of the magnetization process of ferromagnetic materials is the so-called hysteresis, i.e. the dependence of magnetization on the sample history.Magnetization curve of the ferromagnetic sample is a complex-shaped loop, which is called a hysteresis loop.In a sufficiently strong magnetic field the ferromagnetic is magnetized to its saturation. As the field increases, the value of ferromagnetic magnetization remains virtually unchanged.If we then reduce the magnetic induction of the external field and bring it back to zero, the ferromagnetic will retain a remanent magnetization.The sample may be completely demagnetized only in a strong field of opposite direction which is called the coercive field.As the magnetic field of the opposite direction increases, the sample is magnetized again along the field to its saturation.The sample is remagnetized (from the point A to the point B) occurs according to the reverse curve. Thus, due to cyclical variation of the field the curve characterizing the variation of the magnetic moment of the sample forms a loop of magnetic hysteresis.The coercive force and the shape of the hysteresis loop characterize the ferromagnetic properties to maintain remanent magnetization and thereby determine their use. Ferromagnetic materials with a wide hysteresis loop are called hard magnetic materials. They are used to create permanent magnets.Materials with a narrow hysteresis loop and low coercive force are called soft magnetic materials. They are used to manufacture transformer cores, generators and other devices which determine the remagnetization in alternating magnetic fields.Ferrite/ferromagnetic materials with a very small area of the hysteresis loop have found wide application. One of the peculiarities of ferrites is that they do not conduct electric current and their usage helps to reduce remagnetization energy losses.

Category:

Science & Technology

Tags:

• ferrite
• magnet
• physics

[keirfree]

 its pronounced hister- ree -sis

btw 3 oscilloscopes does Not a scientist make, lose the crap Props