When Magnesy neodymowe closed state in a magnetic field to the outside

When Magnesy neodymowe closed state in a magnetic field to the outside via a saturated , then undo the external magnetic field , the magnetic polarization J Magnesy neodymowe internal magnetic induction B does not disappear due to the external magnetic field H and disappear, but will maintain a certain size value, which is called the residual magnetic material

Polarization Jr and residual magnetic flux density Br, collectively remanence . Remanence Jr and Br units and magnetic intensity and magnetic induction of the same unit .

According to the relationship ( 1-1 ), in the demagnetization curve on Magnesy neodymowe , when the magnetic field H 0, Jr = Br, the magnetic field H is negative , J and B are not equal, then divided into two JH and BH curve . From the relation ( 1-1 ) can also be seen that with the increase of the reverse magnetic field H , B changes from the maximum value to 0 Br = Jr , finally the negative variation of the modern Magnesy neodymowe, B demagnetization curve often straight ; variation of the demagnetization curve J is different : with the reverse magnetic field H , B decreases linearly due to the reduced amount of B is always greater than or equal to the value of the reverse magnetic field H of the amount of increase , so can be kept within a certain area on the relatively flat demagnetization curve J straight line , but is always less than the value J Jr.

What is the coercive force (bHc), what is the intrinsic coercivity (jHc)?

On Magnesy neodymowe demagnetization curve , when the reverse magnetic field H is increased to a value bHc, magnet magnetic induction B is 0, the magnetic field H is called the reverse bHc coercivity of the material ; reverse magnetic field H = bHc when the external magnetic flux does not show , so the coercivity bHc characterization Magnesy neodymowe reverse resistance to external magnetic fields or other demagnetization effects. Coercivity bHc is one of the important parameters of the magnetic circuit design.