Abstract
We have successfully fabricated a basic magneto -optical spatial light modulator
(MO-SLM) device driven by spin-transfer-switching (STS), which we
call Spin-SLM technology. The SLM device is comprised of a one dimensional
ten-pixel light modulation array (1
$\times$
10 pixels) with a fine pitch
of 1
$\mu{{m}}$
. The light modulation pixels were composed of Gd-Fe based
giant magneto resistance (GMR) devices, with a free layer of Gd-Fe,
an Ag spacer and a Co-Fe/Tb-Fe-Co pinned layer. The GMR devices were
sandwiched by a Cu bottom and Indium zinc oxide top electrodes in
order to inject current perpendicular to the film plane for switching.
Incident light penetrating the transparent top electrode can be modulated
due to its magneto-optic Kerr effect with the Gd-Fe free layer. The
fabricated device cell size is
${{220}}\times {{300}}\ {{nm}}^{2}$
. We confirmed successful switching of the individual free
layers, which was controlled by STS. We have also fabricated magnetic
hologram patterns with the same magnetic materials used in the light
modulation layer of the Spin-SLM device in order to determine its
feasibility in display applications. The pixel pitch of the pattern
was one micron and a reconstructed image by laser light was successfully
observed with a wide viewing zone angle as 38 deg, which is nearly
the same value expected from calculations. Although these patterns
do not have an electrode to switch the magnetization direction, we
confirmed the potential of Spin-SLM technology as a display device
for 3D holography applications.
© 2014 IEEE
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