Christian-albrechts-universitaet Zu Kiel

Andre Piorra

Eckhard Quandt

Reinhard Knoechel

Patrick Hayes

A magnetic field measuring method using a magnetoelectric composite element as an oscillator, in which a time-dependent measurement magnetic field acts on the magnetostrictive phase of the composite element, and an electrical measurement voltage is tapped off across the piezoelectric phase of the composite element and is used to infer the measurement magnetic field. At least one dielectric phase is connected to the magnetostrictive phase of the composite element by a material bond. When an electrical voltage is applied, the dielectric phase exhibits a change in length, the magnitude of which depends in a non-linear manner on the magnitude of the voltage, and a temporally periodic electrical modulation voltage is applied to the dielectric phase.

Magnetoelectric magnetic field measurement with frequency conversion

Magnetoelectric sensors that can be manufactured using known methods of thin film technology and output an ME voltage that is many times higher for a predetermined magnetic field than the known cantilever-beam sensor. The design that is termed separator ME sensor is characterized by the arrangement of a thick dielectric layer () between the ferroelectric () and the magnetostrictive phases (), and by an electrode arrangement () applied on one side of the ferroelectric () and that is engineered to tap the ME voltage along the extent of the layer. Advantageously, it can be manufactured easily by coating conventional dielectric substrates () on the front and rear with one each of the functional layers ().

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Kiel, Germany

Andre Piorra