Creating and sharing knowledge for telecommunications

Different aspects of spintronics in 2D and 3D materials

on 02-06-2023

... Daigo Oue and Mário Silveirinha are organising a Seminar on different aspects of spintronics in 2D and 3D materials. The Seminar will have three invited speakers, respectively:

15:00 -15:20
Yuichi Saito (Lancaster University)
"MIR-induced antiferromagnetic spin dynamics at room temperature"

Growing nonlinear optics technology, the sub-picosecond laser pulse has extended its wavelength to the mid-infrared (MIR) band (~20um), where ionic vibrations and molecular oscillations broadly exist. For magnetism, this technology enables us to explore lattice-spin interaction directly, such as phonon-induced magnons. At the seminar, we will report the MIR pump - NIR probe result of a canted ferromagnetic material called FeBO3 and discuss the optical absorbance and magnon amplitude spectrum.

15:20 - 15:40
Junta Igarashi (Institute Jean Lamour, Université de Lorraine)
"Sub-picosecond magnetization manipulation induced by ultrafast-spin transfer"

The manipulation of magnetic materials without the use of magnetic fields is of great fundamental and technical interest. The discovery of spin-transfer torque (STT) allowed us to control the magnetization direction electrically in magnetic devices within nanoseconds, which paved the way for non-volatile applications such as spin-transfer- torque magnetoresistive random access memory (STT-MRAM). However, current-induced STT switching below a few hundred picoseconds with low power consumption while maintaining high thermal stability is still challenging. Ultra-short optical pulses can also be used to manipulate the magnetization direction without a magnetic field, which is called all-optical switching (AOS). So far, only specific materials containing ferrimagnet such as GdFeCo have shown ultrafast AOS. Thus, these methods to manipulate magnetization have been mostly developed independently within the fields of spintronics and ultrafast magnetism. In this seminar, I will show our recent work, where we demonstrated sub-picosecond magnetization reversal of a Co/Pt ferromagnetic layer induced by a single femtosecond laser pulse within a common [Co/Pt]/Cu/[Co/Pt] perpendicular spin-valve structure.

15:40 -16:00
Shuichi Iwakiri (ETH Zürich)
"Gate-defined quantum interferometer in magic-angle twisted bilayer graphene"

Magic-Angle Twisted Bilayer Graphene (MATBG) hosts a variety of quantum states, such as superconductivity and correlated insulating phases, which are tunable via gating. The mechanism of these correlated phenomena has been the subject of active theoretical and experimental research.
In this talk, I will present the fabrication and measurement of gate-defined devices to observe quantum interferences in MATBG, such as SQUID and Little-Parks oscillations. These devices are expected to be a powerful tool for elucidating Cooper pair symmetry and, ultimately, the mechanism of superconductivity.

The Seminar will take place on Friday (2nd June), from 15:00 to 16:00, in the Meeting Room, 11th Floor, Torre Norte, Instituto Superior Técnico, Lisboa, Portugal.
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Design and Storytelling in Data Visualization

on 24-05-2023

... It's no secret that Data Visualization can be used in countless contexts. Depending on each of these contexts, there are processes, notions, and modes of presentation that vary. Designing a chart for a child is not the same as programming a dashboard for an administrator’s desk; But, what if the Design principles are the same? What if the secret to telling a good story with graphics is also the same?

In this lecture, the invited speaker Salomé Esteves will explore Data Visualization from its more communicative side and contact with people, touching on points such as principles of design, storytelling, and accessibility.

The lecture will take place on May 24 at 14:00, Amphitheatre 6.01, University of Beira Interior.

Salomé Esteves is a journalist at Renascença and a guest lecturer in Data Visualization and Infographics at the Faculty of Architecture of the University of Lisbon, (FA-ULisboa) since 2019. She holds a degree in Communication Sciences, with a specialization in Journalism, from the University of Porto (2014) and a Master’s in Communication Design at FA-ULisboa (2016).
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