Magnetic Barkhausen Noise: Aspects of Generation and Modeling
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Abstract
The Magnetic Barkhausen noise (MBN) technique
measures discrete changes in magnetization, known as
“Barkhausen jumps”, whi ch can be seen as steps i n the
hysteresis curve. When a ferro-magnetic material is
subjected to an external varying magnetic field, the
magnetization of the material wil l change in a non-linear
way. These changes in magnetization are described by the
hysteresis curve and are the result of modifications of
domain structure of the material. Changes in magnetization
are caused by domain wall creation, domain wall
annihilation, domain wall motion and rotation. In order to
improve the interpretation of Barkhausen noise, models are
needed which describe the dependence of magnetization on
material properties.
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