Abstract
We have developed a magneto-optical spatial light modulator (MOSLM) using giant magneto-resistance (GMR) structures for realizing a holographic three-dimensional (3D) display. For practical applications, reconstructed image of hologram consisting of GMR structures should be investigated in order to study the feasibility of the MOSLM. In this study, we fabricated a hologram with GMR based fringe-pattern and demonstrated a reconstructed image. A fringe-pattern convolving a crossshaped image was calculated by a conventional binary computer generated hologram (CGH) technique. The CGH-pattern has 2,048 × 2,048 with 5 μm pixel pitch. The GMR stack consists of a Tb-Fe-Co/CoFe pinned layer, a Ag spacer, a Gd-Fe free layer for light modulation, and a Ru capping layer, was deposited by dc-magnetron sputtering. The GMR hologram was formed using photo-lithography and Krion milling processes, followed by the deposition of a Tb-Fe-Co reference layer with large coercivity and the same Kerr-rotation angle compared to the free layer, and a lift-off process. The reconstructed image of the ON-state was clearly observed and successfully distinguished from the OFF-state by switching the magnetization direction of the free-layer with an external magnetic field. These results indicate the possibility of realizing a holographic 3D display by the MOSLM using the GMR structures.
Highlights
Holography [1, 2] has emerged as a very attractive method for 3D imaging because it reconstructs the same wavefronts of light that are emitted from objects
The magneto-optical spatial light modulator (MOSLM) driven by an external magnetic field, which consists of garnet film, has a large degree of the light modulation compared to other MOSLMs
5!m (b) patterns made of giant magneto-resistance (GMR) multilayers (GMR hologram) without electrode for driving which can be fabricated with relatively simple lithography technique, and evaluated the capability of displaying images with magnetic materials
Summary
Holography [1, 2] has emerged as a very attractive method for 3D imaging because it reconstructs the same wavefronts of light that are emitted from objects. We have studied an ultra-fine SLM which may have potential to display 3D images with a wide viewing-zone angle, and proposed a MOSLM using giant magneto-resistance (GMR) structures which is driven by spin-transfer-switching (STS) [8], which we call SpinSLM. Instead of fabricating large scale Spin-SLM in order to study reconstructed images from them, we take relatively simple and easy way to fabricate hologram. 5!m (b) patterns made of GMR multilayers (GMR hologram) without electrode for driving which can be fabricated with relatively simple lithography technique, and evaluated the capability of displaying images with magnetic materials
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