Challenges in ferromagnetic-piezoelectric magnetoelectric 2-2 composite sensor structures

Date

Sep 26, 2018

Time

10:00 AM - 11:00 AM

Speaker

Prof. Dr.-Ing. Jeffrey McCord

Affiliation

Kiel University, Institute for Materials Science

Language

en

Main Topic

Materialien

Other Topics

Materialien, Physik

Host

Brit Präßler-Wüstling

Description

From an engineering point of view, magnetoelastic interactions are often considered an effect that negatively affects soft-magnetic device applications. The use of magnetic materials with strong magnetoelastic contributions is challenging due to the strong coupling of stress and strain to the magnetic domain structure. Yet, the utilization of magnetostrictive effects offers a path to new sensor concepts with remarkable sensitivity and low limit of detection. Depending on the magnetic field frequency, the minimum detectable magnetic field can be below 1 pT/Hz^1/2. For the performance of resonant ferromagnetic-piezoelectric magnetoelectric 2-2 composite sensor structures we find significant noise contributions of magnetic origin. Separating electrical and magnetic contributions from the piezoelectric, respectively ferromagnetic phases is essential for the optimization of composite magnetoelectric sensor structures working in the kHz to hundred MHz regime. Applying magneto-optical imaging under in-operando conditions on various timescales, the occurring magnetic effects can be evaluated. Magnetic domain effects will be discussed on different types of 2-2 composite sensor structures. The examples include magnetic model structures, magnetically and electrically modulated, and surface acoustic wave sensor devices. Magnetic characterization is compared to electrical analysis. Conclusions for the further optimization of magnetoelectric sensors, especially of their noise characteristic, will be discussed.

Links

• Seminars at the IFW

Last modified: Sep 12, 2018, 2:08:26 AM