Scope:
Recent fine technologies have achieved fabrications of materials with atomic scale controls such as ultrathin films, multilayers and nanocomposites. Especially we could obtain fine oxide materials called <Function Harmonized Oxides>, through a discovery of oxide high temperature superconductors. In this symposium we fabricate the function harmonized (1) oxide thin films, (2) oxide nanocomposites and (3) non-oxide thin films and nanocomposites, then clarify differences and commonalities of their function harmonized properties to obtain novel devices. We focus on interfaces and grain-boundaries to recognize these.
<Function Harmonized Materials> should show various natures as ferroelectric, ferromagnetic, multiferroic, insulating, semiconducting, metallic and superconducting properties depending on elemental components while keeping substantial identical lattice structures. It is known in the function harmonized perovskite oxides containing transition metal elements, a novel idea of strong electron correlation is the most important factor, due to this they exhibit unique properties arising from electron spin and charge. This electron correlation can be controlled by lattice distortions, elemental substitutions in lattices and carrier transfers from the vicinal atomic layers.
In this symposium we fabricate three categories of function harmonized materials and investigate relations between the above mentioned function harmonized properties and structures (phases). First we fabricate (1) the <oxide thin films and multilayers>, then try to fabricate (2) the <oxide nanocomposites> having the same components with <oxide thin films and multilayers>. We clarify whether the two materials show the similar or dissimilar properties. Lastly we challenge to fabricate (3) the <non-oxide thin films (multilayers) and nanocomposites> which exhibit the function harmonized properties. We hope respective researchers bring these results and considerations in our symposium and discuss together to get our deeper understandings.
Topics:
1) Fabrication of function harmonized thin films (ALD, MBE, laser abrasion, plasma deposition, CVD, others) and nanocomposites (solid, liquid, vaper methods).
2) We try various oxide materials (STO, BTO, ZnO, MgO, TiO2, LSMO, LBMO, VO, PZT, YBCO, BSCCO, others).
3) We challenge non-oxides (Graphene, Carbon nanotube, SiC, amorphous C, MoS2, ZrB2, CoFe-AlN, SnSe, others)
4) Thin films, Ultrathin films, Double layers, Multilayers, Composites, Nanocomposites, Nanoparticles and Bulks are included.
5) Estimation techniques (I-V, C-V, M-T, EPR, FMR, SCUID, Optical, FTIR, Raman, Microscope, STM, SPM, XPS, In-situ monitor by laser, RHEED, others)
6) Ferroelectric, ferromagnetic, multiferroic, insulating, semiconducting, metallic and superconducting properties.
7) Phase transition (Multiferroic) induced by I, V, T and light, Resistive switching under I-V, R-T and light, others.
8) Phase separation of LSMO and LBMO.
9) We consider properties consistently in terms of grain-boundaries, interfaces and surfaces in the nanocomposites, multilayers and thin films.
10) We propose here one effective procedure to investigate the respective roles of and . [1] The ideal multilayers with perfect ordered interfaces (in 2 and 3 dimensions) are fabricated. [2] They are irradiated by ion beams at various doses, then the ordered interfaces are gradually changed into disordered interfaces (i.e., random grain-boundaries) with increasing dose. [3] We investigate the correlations between translated structures and properties at the respective dose steps. This gives a clear hint to elucidate the roles of complex grain-boundaries in the nanocomposites which are normally laborious to clarify.
