These parameters used e . g . in Philips'handbook and Magnetic Materials Producers Association " Soft Ferrites, A Users Guide ".
2.
There are 2 issues you may need to address : 1 ) with a soft ferrite of an intial permability of only 9, you may need to prove analytically that magnetisation will be sufficiently even, throughout the magnetisation / demagnetisation cycle . 2 ) The requirement to go in and out of saturation within 50 nS will be difficult to meet.
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