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Seminář / Úterý, 28.01.2020 10:00

John Mangeri (Fyzikální ústav AV ČR, oddělení dielektrik)

This talk will summarize experimental and theoretical advances in magnetic and ferroelectric materials at multiple length scales. I will first discuss some recent work on exotic magnetic and polar states observed in BiFeO3 domain walls [1] and skyrmion states found in PbTiO3/SrTiO3 superlattices [2]. Both systems motivate the need for accurate predictive modeling of structural order parameters which need to be carefully coupled to their complex boundary conditions. To that end, I will provide an update on the following theoretical projects that we, at the institute, have been working on: (i)...

Seminář / Středa, 29.01.2020 14:00

Harold Erbin (University of Turin)

Abstrakt: Machine learning has revolutionized most fields it has penetrated, and the range of its applications is growing rapidly. The last years has seen efforts towards bringing the tools of machine learning to lattice QFT. After giving a general idea of what is machine learning, I will present two recent results on lattice QFT: 1) computing the Casimir energy for a 3d QFT with arbitrary Dirichlet boundary conditions, 2) predicting the critical temperature of the confinement phase transition in 2+1 QED at different lattice sizes.

Seminář / Čtvrtek, 30.01.2020 16:00

Tomáš Ledvinka (Univerzita Karlova, Praha)

Abstrakt: Despite the tremendous success of mathematical general relativity which revealed among others surprising features of the geometry of rotating (Kerr) black holes and developed approximation techniques to study early stages of their inspiral, the necessity to describe completely the merger of two black holes lead to a substantial progress of numerical relativity. This field necessarily uses techniques of modern computer science to amass and command number crunching capabilities of current computers as well as numerical methods for partial differential equations, but the successful...

Seminář / Úterý, 04.02.2020 10:00

Soutik Betal

World’s Smallest medical robot as the record set on Guinness World Records works on magnetoelectric mechanism in a core-shell heterostructured nanocomposite. Under influence of remotely applied modulated magnetic field, the core and shell of the nanostructure interact with each other to generate high localized electric field. The magnetic body guides and excites Nanorobot’s propel. The on demand shell’s electrification gives Nanorobot, a capability to act as an ambient electrical field sensor in bio-cellular environment and performs four remotely controlled cellular interactions. Sensing...

Workshop / Čtvrtek, 06.02.2020 09:00 - Pátek, 07.02.2020 18:00

Michal Dušek, Václav Petříček, Jan Rohlíček

Workshopy "Ad hoc" o programu Jana2006 jsou dvoudenní akce pořádané autory krystalografického programu Jana2006. Účastníci workshopu si sami vybírají témata, která jsou vyvěšena na webové stránce jana.fzu.cz, a workshop se koná, jakmile se několik osob shodne na výběru témat.

Seminář / Pondělí, 17.02.2020 11:00

Aleš Hrabec (ETH Zurich & Paul Scherrer Institut, Switzerland)

Magnetically coupled nanomagnets have many potential applications. In order to realize functional two-dimensional networks of coupled nanoscale magnetic elements, it is desirable to engineer effective lateral magnetic couplings in a controllable way. I will show that we are able to develop a method to control the lateral coupling between adjacent magnetic nanostructures based on the interfacial Dzyaloshinskii-Moriya interaction (DMI). We have patterned regions with in-plane (IP) and out-of-plane (OOP) magnetic anisotropy in a magnetic element using selective oxidation of Pt/Co/Al films, and the magnetization in the OOP and IP parts of the islands are coupled via DMI arising from the Pt underlayer. This results in chirally coupled magnetization. We have exploited this concept for various applications.

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