Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Direct-Write Nanofabrication and Applications III
(Electron Beam Induced Processing) (joint session DS/TT)
TT 62.1: Hauptvortrag
Donnerstag, 4. April 2019, 15:00–15:30, H32
Artificial nano-granular heterostructures: fundamentals and applications — •Oleg Udalov1,2 and Igor Beloborodov1 — 1California State University, Northridge, USA — 2Institute for Physics of Microstructures RAS, Nizhny Novgorod, Russia
Granular composites are a large class of artificial materials in which nanograins are embedded into a hosting matrix. Combining different types of grains and matrix one can obtain composites with desirable functionalities. Fabrication of granular materials is scalable and is much cheaper than, for example, the thin film preparation techniques. Such an advantage makes these materials very attractive for various applications, including medical, photonic, radiofrequency, mechanical, etc. Properties of granular materials are defined by the interplay of disorder, dimensionality, surface and size effects, superconductivity, magnetic interactions, strain, the Coulomb blockade, etc. Therefore, studying of these materials is a complicated challenge promising unexpected novel properties. Nanograins ensembles are often used as a prototype of systems with competitive interactions and strong many-body effects. This makes granular materials of a great fundamental interest. In this talk we will focus on recent developments in solid granular materials. First, we discuss different types of granular media and their applications. In particular, we will consider granular metals, ferromagnets, superconductors and semiconductors. Next, we will discuss granular multiferroics where two order parameters are combined: 1) magnetization and 2) polarization. We will consider theoretical and experimental works on magneto-electric coupling in these materials.