The 294th MANA Seminar
Prof. Matthieu Petit & Prof. Jean-Manuel Raimundo
| Date | October 26, Friday |
| Time | 15:00-16:30 |
| Place | Auditorium, 1F, WPI - MANA Bldg., NAMIKI Site, NIMS |
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15:00-15:45
Growth of Mn5Ge3 multilayers for spintronic and bio-sensors
The Mn5Ge3 compound, thanks to its room-temperature ferromagnetism, metallic character and ability to epitaxially grow on germanium, acts as a potential candidate for spin injection into group-IV semiconductors. Understanding and controlling Ge overgrowth behavior on Mn5Ge3/Ge heterostructures represent a crucial step to realize Ge/Mn5Ge3/Ge multilayers for numerous spintronic applications. After a brief overview of the properties of Mn5Ge3, the mechanisms of Ge overgrowth on epitaxial Mn5Ge3 layers as a function of the substrate temperature will be presented. We will see that this is a typical example in which stabilization of metastable thin films by epitaxy can overcome the thermodynamic equilibrium. Then the effects of carbon adsorption on the top of the Mn5Ge3 layers and carbon incorporation inside the Mn5Ge3 layers on the Ge overgrowth will be investigated.
Speaker
Prof. Matthieu Petit, Aix-Marseille University, Polytech'Marseille/CINaM-CNRS, France
Chair
Dr. Yutaka Wakayama, MANA Scientist, MANA, NIMS
15:45-16:30
From thiacalix[n]arenes to azacalix[n]arenes toward new opportunities and new applications
Up to now, calixarenes represent one of the most widely used platform in supramolecular chemistry which ushered to the most significant technological advances for biological applications and materials, with the development of already commercially available devices such as sensors for selective recognition and chemical separation or speciation. One of the reasons of their development finds out its roots in the simplicity of their synthesis providing highly functionalized molecules associated to a bowl-shape structure and used as scaffolds for modular assembly of complex macromolecules. Recently, a great interest in respect to their analogous incorporating heteroatoms on the bridge has stimulated many efforts in order to set up new properties and functionalities on such macrocycles. In this context, we have developed a simple strategy based on a nucleophilic aromatic substitution reaction, in order to introduce heteroatoms on the bridge, and affording the desired heteracalixarenes in high yields. Some examples and properties will be presented herein as well as the synthesis of new mixed-heteracalixarenes incorporating two different heteroatoms on the same scaffold and the on-going research toward nanoarchitectures.
Speaker
Prof. Jean-Manuel Raimundo, Aix-Marseille University, CINaM UMR CNRS 7325, Chemistry Department, Molecular Engineering and Functional Materials, France)
Chair
Dr. Yutaka Wakayama, MANA Scientist, MANA, NIMS