Generalized Energetic Model for Characterizing the Magnetic Hyste

Generalized Energetic Model for Characterizing the Magnetic Hyste

Institut: Elektrotechnik u. Informationste
Autor: Peter Haumer
ISBN: 9783903024106
Seitenanzahl: 213
Herausgeber: TU Verlag
Erscheinungsort: Wien

About this Book
In this book, a generalized two-dimensional energetic hysteresis
model for characterizing the magnetization process of thin
ferromagnetic films is presented. Based on the “Energetic Model of
Ferromagnetic Hysteresis” (EM), which has been introduced by H.
Hauser in 1994, so called statistical domain classes adapted from the
magnetic easy directions of the material sample are distinguished.
As a first generalization, the orientation of the elementary magnetic
dipoles within a statistical domain class is no longer restricted to the
specified easy direction, but is represented by a stochastic circular
distribution function that is characterized by a mean orientation and
a certain variance. So local misalignments of magnetic moments due
to imperfections within the material can be modeled on the one hand,
and the temperature dependence of the spontaneous magnetization
can be described from the first principles on the other hand. The
second key extension is the fully two-dimensional formulation of the
EM comprising all the energy contributions of the model.
On the example of Permalloy thin films for AMR sensors, it is
demonstrated how variations in the technological parameters of the
underlying sputter process influence the microstructural misalignment
of the magnetic dipole moments, which becomes manifest in the
macroscopic magnetization curves. As shown within this work, the
generalized EM is able to quantify the homogeneity of the film as well
as these misalignments in terms of anisotropy dispersion.

Peter Haumer

Peter Haumer was born in St. Pölten, Austria in 1975. Having
finished Master studies in Electrical Engineering (2001) and Business
Informatics (2003), he started PhD studies in Technical Science at
Vienna University of Technology. The PhD thesis about magnetic
hysteresis modeling for thin film material has been supervised by Prof. Hans Hauser until his death in 2007, and afterwards by Prof. Johann Nicolics. During his research, the author has presented his results at international conferences and published several articles on magnetic hysteresis modeling in international journals.
Besides his scientific work, Peter Haumer is currently employed as
control systems engineer in the field of electric traction systems for
rail vehicles.

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