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Newsletter June

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In order to study the internal friction of thin films a nodal suspension system called GeNS (Gentle Nodal Suspension) has been developed. The key features of this system are: i) the possibility to use substrates easily available like silicon wafers; ii) extremely low excess losses coming from the suspension system which allows to measure Q factors in excess of 2x108 on 3” diameter wafers; iii) reproducibility of measurements within few percent on mechanical losses and 0.01% on resonant frequencies; iv) absence of clamping; v) the capability to operate at cryogenic temperatures. Measurements at cryogenic temperatures on SiO2 and at room temperature only on Ta2O5 films deposited on silicon are presented.

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The silicon wafers storage (or other materials) perfectly polished must be inventoried in controlled atmosphere area (Ideally in clean room) as soon as they are out from there double packaging sealed in clean room.

Actually, in uncontrolled atmosphere area, there are always a residual particulate contamination which changes depending the geographic situation.

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The Czochralski (Cz) Pulling process to achieve Silicon wafers and Silicon crystals

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Have a look to our newsletter of March !

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The field of applications for monocrystalline silicon are always more numerous. On side of classical fields such as microelectronics or micromechanics, new industries such as biotechnologies or watch makers use silicon wafers with different characteristics for different needs than standard wafers.

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Magnetic skyrmions are nanometer scale magnetic texture. They have recently been observed for the first time at room temperature in materials compatible with the electronics industry independently by two French team from CNRS in Grenoble and in Palaiseau. These results open a way for the use of skyrmions as nanoscale information carrier in computers.

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The semiconductor industry is manufacturing chips that are included in all electronic devices, telephones, computer, television, watch industries, optics, photonics, micro sensors, MEMS, etc… 

To manufacture those devices in mass production, the starting raw material has been silicon since more than 45 years. Today, new materials are arriving in this industry, but silicon is still in first position.

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The silicon material has different diffractions in X-rays regarding the crystalline orientation. If standard crystalline orientations such as (100) or (111) have important diffraction pics, there is a specific crystalline orientation with no diffraction on X-rays.

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Finnlitho offers nanolithography services from R&D and prototyping to production of small series. The company is specialized in products and processes related to diffractive X-ray optics: this includes Fresnel zone plates, beam shapers and various other phase- and amplitude elements for soft- and hard X-ray ranges. Typical customers are synchrotron beamlines and their users who have need for highly specialized nanostructures.

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Over the past 20 years, scientists have been developing metamaterials, or materials that don't occur naturally and whose mechanical properties result from their designed structure rather than their chemical composition. They allow researchers to create materials with specific properties and shapes. Metamaterials are still not widely used in everyday objects, but that could soon change.

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A group of researchers led by Stanislav Evlashin, a senior research scientist at the Skoltech Center for Design, Manufacturing and Materials (CDMM), demonstrated a simple and 100% efficient method of converting silicon wafers into nanoparticles in an aqueous solution. This discovery can help find an environmentally friendly way of silicon recycling without using toxic chemicals.

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