When strain waves pass through a ferromagnetic bar, owing to piezomagneticeffect, a nonuniform magnetic current will be stimulated by the strain wave simultaneously.
应变波通过铁磁性杆件时，由于压磁效应，可以激发出不均匀的磁流。
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The generation of the magnetic signals at LF band may be caused by the emission of electrons from the breaking crystals in the rocks, whereas that of ULF band by the piezomagneticeffect.
Piezoelectric and piezomagnetic composites are a new type of functional material, which has far bigger magnetoelectric effect than a single phase material.