Remanence and Retentivity

[alok1982]

Hi!
Is the meaning of both "Remanence" and "Retentivity" is same for a ferrite material?
Is for a ferrite it should be low or high?

Also, for ferrite, is required coercivity should be high or low?

Please suggest.

Thanks!

 

[dr pepper]

I've never heard of rententivity, it sounds the same as remanence though.
'Square' ferrite has high remenance.
Coercivity is the magnetic flux applied to magnetize the ferrite from a winding, it depends on the application as to whether you want the ferrite to be high or low, for a flyback smps you'd want ferritte that can withstand high coercivity, a common unit for coercivity is oersteds.