"Magnetic information in the light diffracted by submicron-scale periodic magnetic arrays"
Relatore: Dr. Paolo Vavassori- ** INFM-CNR National Research Center S3 and Dipartimento di Fisica, Universita di Ferrara, Italy.
Aula Melloni Dipartimento di Fisica
29 Marzo 2007 ore 15.00
|The experimental and theoretical aspects for
obtaining the magnetic information carried
by laser beams diffracted from an array of
nano-sized magnetic objects is reviewed.
Experimentally it will be shown that
the Magneto Optic Kerr Effect (MOKE)
hysteresis loops recorded on diffracted
beams can be quite different from those
recorded in the reflected beam. We will
show that the Diffracted-MOKE (D-MOKE)
loops are proportional to the magnetic
form factor, or equivalently, to the
Fourier component of the magnetization
corresponding to the reciprocal lattice
vector of the diffracted beam. In conjunction
with micromagnetic simulations D-MOKE provides
a powerful and non-destructive technique for
investigating the magnetization reversal process
in submicron sized magnetic particles.
The advantages and disadvantages of
the D-MOKE technique will be compared
to those of other techniques that yield
related information (e.g. Magnetic Force
Microscopy, Lorentz Electron Microscopy
and Micromagnetic simulations).