Patent ID: 7201817
Filing Date: 2007-04-10
Classification: H01F,H01L,Y10T

Abstract:
1. In a method for forming a magnetoelectric composite wherein a combination of a piezoelectric composition and a magnetostrictive composition are joined together as a laminate in alternate separate layers to provide a bilayers or multilayers, the improvement which comprises: (a) providing a first layer of a bimetal ferrite powder mixed with a first binder with a thickness between 10 and 200 μm, wherein zinc is one of the metals, as the magnetostrictive composition; (b) forming a combination of the first layer of step (a) with a second layer of a powder of a piezoelectric material mixed with a second binder with a thickness between 10 to 200 μm in the separate layers; and (c) compressing and sintering the combination of step (b) to form the magnetoelectric composite, wherein the compression of the first and second layer is between about 3000 and 5000 psi to provide green laminated bilayers or multilayers which are heated to 1050 to 1200° C. to evaporate the binder and then finally sintered at about 400 to 1500° K, wherein the piezoelectric material of the first layer of composite is electrically poled and the composite has a magnetoelectric voltage coefficient of at least 100 mV/cm Oe measured at a frequency of 100 Hz at room temperature.