We are delighted to see the enormous interest in the new On-line SPICE-SPIN+X Seminars. We had 500 participants in Zoom (to capacity) and over 300 watching life on YouTube. Tomas Jungwirth gave the inaugural seminar on Antiferromagnetic spintronics: from memories to ultra-fast optics and topological transport. His talk is available on the SPICE YouTube Channel and can also be reached to the direct link here.
To receive by e-mail the Zoom Meeting log-in information and the announcements, please sign up to the seminars e-mail list (no further announcements on the on-line seminars will be sent by the news-from-spice mailing list). You can click here for the e-mail list sign-up form or find it directly at the SPICE-SPIN+X Seminars website.
In the time of physical distancing, it is more important than ever to remain close socially and scientifically. The Spin Phenomena Interdisciplinary Center SPICE and the Collaborative Research Center SPIN+X have joined forces to start a weekly condensed matter seminar series with an emphasis on spin and topological physics.
The talks will be given via Zoom and live streamed on the SPICE YouTube Channel, with most of them also available afterwards on the channel.
To receive by e-mail the Zoom Meeting log-in information and the announcements, please sign up to the seminars e-mail list (no further announcements on the on-line seminars will be sent by the news-from-spice mailing list). You can click here for the e-mail list sign-up form or find it directly at the SPICE-SPIN+X Seminars website. To listen to the talk through the livestreaming, simply go to the SPICE YouTube Channel at the time of the seminar. Attendance is of course free.
Elastic Tuning and Response of Electronic Order
New physical phenomena have emerged from a particularly strong coupling between a materials’ elasticity and its symmetry-broken electronic quantum phases. Examples are reversible superelasticity with large recoverable strain in iron-based materials, strong nonlinear elastic response with violation of Hooke’s law and critical elasticity in pressurized organic charge-transfer salts, a doubling of the superconducting transition temperature in strained strontium ruthenate, strain-induced charge order in cuprate superconductors, as well as nematicity in iron-based superconductors. Static and dynamic strain manipulation has emerged as a new knob to tune and shape a material’s electronic properties.
Novel Electronic and Magnetic Phases in Correlated Spin-Orbit Coupled Oxides
The interplay between spin, orbit and electron correlation has emerged as a new paradigm in contemporary condensed matter physics and represents a rich playground for the realization of novel quantum state of matters with exotic electronic and magnetic properties including Dirac-Mott insulators, Lifshitz/Slater phases, Multipolar and Kitaev model magnetism, unconventional superconductivity and topological physics.
Molecular electronics originally promised miniaturization of molecular devices using Nature’s smallest building blocks to allow for novel electronic function by simply altering the chemical structure of the molecular component. Molecular electronics has evolved towards a complementary technology to silicon-based electronics, providing functionalities not possible with classical electronic devices. After more than 40 years of experiments, it remains a challenge to rationally design molecule-electrode junctions due the complex interplay between electronic structure and the chemical/supramolecular arrangement of the interfaces. Unlike traditional CMOS electronics, comprehensive design rules for molecular junctions are not available yet. Only bits and pieces have been published scattered across disciplines, including interface engineering, supramolecular chemistry, surface science, computational science, physics, chemistry, optics, biology and micro/nanofabrication.
Antiferromagnetic Spintronics: from topology to neuromorphic computing
The new field of antiferromagnetic spintronics focuses on making antiferromagnets active elements of spintronic devices. The higher complexity of the ordered phase and parameter space in antiferromagnets have given rise to new avenues of basic research that range from topological quasiparticle dynamic manipulation, multipole order effects, ultra-fast dynamics, and even applications towards neuromorphic computing and IoT.
The new field is of interest to the strongly correlated effects community and the community focused on topological matter. It has connected to the current ferromagnetic spintronics research by creating entirely new ways of rethinking spin phenomena in antiferromagnets, while benefiting from the pioneering works in antiferromagnetic materials.
YRLGW: Topomagnetism Is Coming: Relativity and Correlations in Topological Magnets
Remarkable advances in strongly correlated and relativistic condensed matter physics have been made over the past decade by these largely non-interacting communities. Interestingly, their attention recently focused on the same grand challenges such as room-temperature quantum chiral edge modes, topological superconductivity, or topological computation.
The research of nonmagnetic materials culminated in predicting that approximately one third of them exhibit topological electronic structure. In contrast, the investigation of topological magnets is progressing at much slower pace albeit time-reversal symmetry broken topological phases demand magnetic order. For a long time, low-dimensional topological systems were anticipated to be naturally incompatible with robust magnetism. However, recent theoretical and experimental efforts have revealed low-dimensional as well as 3D topological insulators and Weyl semimetal magnets. The relativistic phenomena, e.g. the spin Hall, quantum spin Hall, or magnetic spin-Hall effect, were originally predicted within the single-particle picture. However, realistic predictions of magnetic materials, requires inclusion of the electronic correlations. Conversely, the correct description of strongly correlated magnets with high atomic numbers needs to include spin-orbit coupling phenomena.
Skyrmionics Workshop for Young Researcher
The recent interest skyrmionic materials have provided a new playground for the study of topological solitons. The topologically non-trivial magnetic spin textures can facilitate fast current-induced magnetization manipulation, which makes these exotic textures widely advantageous for many areas of technology, from spintronics to neuromorphic computing.
The current research effort is to detect, visualize, and manipulate the magnetic states: by momentum space mapping such as small angle neutron scattering, by real space detection such as Lorentz transmissions electron microscopy, by transport such as the topological Hall effect, and manipulation by external fields resulting in the skyrmion Hall effect. The extensive study of their transport properties and the ability to create a controlled environment for the creation and annihilation of magnetic skyrmions are essential steps towards the realization of skyrmion-based devices. Skyrmions can exist in a multitude of systems, bulk, multilayer heterostructures, and films with a variety of shapes due to the internal symmetry and the competition of exchange interactions. The increasing number of skyrmion hosting materials combined with the rapid growth of the research field provides a promising prospect to overcome the challenges for next-generation devices.
Gordon Research Conference: Spin Transport and Dynamics in New Geometries, Materials and Nanostructures
In recent years the fields of spintronics has greatly expanded towards new materials, new functionalities, and new device concepts. In the new materials front, antiferromagnetic metallic and insulating systems have been shown to be effective transport media of spins, allowing for very high frequency applications and efficient electric control of the magnetic order parameter. There has also been a tremendous progress in the realization of magnetism in two dimensional materials, where new functionalities, such as spin valves, have been also demonstrated recently. Due to their spin-valley coupling these material systems also connect spins with photons. In addition, new forms of spin-orbit coupling have been discovered in magnetic and non-magnetic systems, connecting new materials with topological insulator and Weyl materials that promise new functionalities based on the control of these type of high-energy-like quasiparticles. A remaining materials frontier in spintronics is organic systems, which seems to be very different from solid state spintronics, exhibiting new chiral phenomena which remains to be fully understood. Finally, as an emergent new device concept, the conference will cover the area of neuromorphic computing in spintronics, where Skyrmions, and other spin systems, are being touted as future platforms for such type of brain-inspired devices.
Ultrafast Spintronics: from Fundamentals to Technology
The 21st century digital economy and technology is presently facing fundamental scaling limits (heating and the superparamagnetic limit) as well as societal challenges: the move to mobile devices and the increasing demand of cloud storage leads to an enormous increase in energy consumption of our ICT infrastructure. These developments require new strategies and paradigm shifts, such as spin-based technologies and the introduction of photonic processors. Currently, photons are used for information transport, electrons for processing and spins for storage. Future developments will require integration of these separate technologies. Spintronic or spin-based memory such as Spin-torque transfer magnetic Random Access Memory (STT-RAM) is one concept that may revolutionize memory technology. The ability to control spins and macroscopic magnetic ordering by means of femtosecond laser pulses provides an alternative and energy efficient approach to magnetic recording. But this will only provide a novel and energy efficient alternative to current data storage if spintronics can be integrated with photonics. Such integration may also allow faster spin logic. Antiferromagnetic materials may provide another alternative for fast spintronics, but there are still many challenges. In this workshop we want to discuss recent developments in this exciting field as well as the challenges that lay ahead.