C8.4 - Characterization and Simulation of a Magnetized Sample
- AMA Conferences 2017
2017-05-30 - 2017-06-01
- Proceedings Sensor 2017
- C8 - Material Characterization
- M. Linnert, A. Sutor, S. Rupitsch, R. Lerch - University of Erlangen-Nuremberg (Germany)
- 424 - 428
For several decades, magnetic sensors have been exploiting the nonlinear relation between the magnetic field strength and the magnetic flux density. Whereas strong saturation effects were most relevant in the past, today energy consumption of modern sensors plays an increasingly important role. Recent semihard magnetic materials concern this issue by retaining a significant magnetic flux density even when all excitation currents are turned off. Nevertheless, in contrast to classical hard magnets, it is relatively easy to commutate them. With sensor development cycles becoming shorter, there is an increasing demand for accurate numerical models concerning hysteresis. In this contribution, we present a new combination of scalar and vector material characterization techniques to compute the remanent magnetic field of a magnetized sample by static finite element (FE) simulations. Vacuumschmelze offers a suitable semihard magnetic material with a coecivity field around 2kA/m that is available as thin stripes. In a first step, the Sensorvac material will be characterized to obtain meaningful material properties required for simulations. With material parameters having been identified, the remanent magnetic field of the magnetized sample will be computed. As it is revealed, simulation results coincide very well with laboratory measurements. In future, the model can be applied to design complex sensors.