For a MnZn ferrite torroid ring, i have made field annealing in the Φ direction by winding the coils to create the circle field, OR, in the Z drection by put it in the gap of a magnetic path compositing of coils and pure Iron, respectively above the curie temperature. The result demonstrated that the permeability of the anisotropy ferrite increased to three fold and two fold of the isotropy ferrite, respectively. In addition, the loss in the 1 MHz increase to tenfold and sixfold of the isotropy ferrite, respectively. When re-annealing the anisotropy ferrite without field above curie temperature, the loss and permeability bring back to the isotropy ferrite again.
It seems that the permeabilty and loss could not be decreased by creating easy axis and hard axis in the torroid ring. for the isotropy ferrite, the domain distributed randomly, as a result, the permeabilty should be 1/3 of the single domain from the viewpoint of stastics. But in the case of easy axis, hard axis and isotropy sample, the wall movement, rotation and both should be dominated, respectivley. from this view, the permeability of the isotropy sample should be between sample between easy axis and hard axis. It is very confusing.
Hi, Abdullah, I have read the paper you cited. It is about the modification of the magnetic perfomance by additive into the ferrite lattice. But in our case, no additive is added and only the orientation of the anisotropy to the exicting field changes.
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