Magnetoelectric multilayer composites for field conversion
First Claim
1. In a magnetoelectric composite comprising at least one piezoelectric composition and at least one magnetostrictive composition as separate layers joined together, the improvement which comprises:
- a sintered bimetal ferrite as the magnetostrictive composition, wherein one of the metals is zinc, and wherein the composite has a magnetoelectric voltage coefficient of at least 100 mV/cm Oe.
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Accused Products
Abstract
Magnetoelectric multilayer composites comprising alternate layers of a bimetal ferrite wherein one of the metals is zinc and a piezoelectric material for facilitating conversion of an electric field into a magnetic field or vice versa. The preferred composites include cobalt, nickel, or lithium zinc ferrite and PZT films which are arranged in a bilayer or in alternating layers, laminated, and sintered at high temperature. The composites are useful in sensors for detection of magnetic fields (10); sensors for measuring rotation speed, linear speed, or acceleration; read-heads in storage devices by converting bits in magnetic storage devices to electrical signals; magnetoelectric media for storing information; and high frequency devices for electric field control of magnetic devices or magnetic field control of electric devices.
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Citations
10 Claims
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1. In a magnetoelectric composite comprising at least one piezoelectric composition and at least one magnetostrictive composition as separate layers joined together, the improvement which comprises:
a sintered bimetal ferrite as the magnetostrictive composition, wherein one of the metals is zinc, and wherein the composite has a magnetoelectric voltage coefficient of at least 100 mV/cm Oe. - View Dependent Claims (2, 3, 4, 5)
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6. In a method for forming a magnetoelectric composite wherein a combination of a piezoelectric composition and a magnetostrictive composition are joined together in separate layers, the improvement which comprises:
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(a) providing a bimetal ferrite powder, wherein zinc is one of the metals, as the magnetostrictive composition;
(b) forming a combination of the powder of step (a) with a powder of a piezoelectric material in the separate layers; and
(c) compressing and sintering the combination of step (b) to form the magnetoelectric composite. - View Dependent Claims (7, 8, 9, 10)
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Specification