Libor Smejkal has predicted a new type of phenomena in the family of spontaneous Hall effects connected to a new type of exchange splitting that depends on the momentum of the electron quasiparticle.
Abstract: Electrons, commonly moving along the applied electric field, acquire in certain magnets a dissipationless transverse velocity. This spontaneous Hall effect, found more than a century ago, has been understood in terms of the time-reversal symmetry breaking by the internal spin structure of a ferromagnetic, noncolinear antiferromagnetic, or skyrmionic form. Here, we identify previously overlooked robust Hall effect mechanism arising from collinear antiferromagnetism combined with nonmagnetic atoms at noncentrosymmetric positions. We predict a large magnitude of this crystal Hall effect in a room temperature collinear antiferromagnet RuO2 and catalog, based on symmetry rules, extensive families of material candidates. We show that the crystal Hall effect is accompanied by the possibility to control its sign by the crystal chirality. We illustrate that accounting for the full magnetization density distribution instead of the simplified spin structure sheds new light on symmetry breaking phenomena in magnets and opens an alternative avenue toward low-dissipation nanoelectronics.
The DFG has funded the CRC TRR288 ELASTO-Q-MAT initiative. It involves the JGU (Sinova co-speaker), Goethe University Frankfurt (Roser Valenti as coordinator and speaker), the Karlsruhe Institute of Technology (Joerg Schmalian co-speaker), and the Max Plank Institutes in Mainz and Dresden. This initiative has the goal to understand, advance, and exploit new physical phenomena emerging from a particularly strong coupling between a material's elasticity and its electronic quantum phases. To this end, we will study the effects of elastic tuning and elastic response of various types of electronic order in representative classes of quantum materials that share a high sensitivity to intrinsic strain or externally applied stress fields
We congratulate Olena (Helen) Gomonay on obtaining her first DFG research grant “SHARP: Spintronics witHAntiferRomagntes and Phonos”. Well done Helen!
The proposed research project will open and explore new ways to detect and manipulate antiferromagnets using phonons and magneto-elastic coupling effects.
SPICE welcomes today the network meeting of the new SPP program on Skyrmions. The meeting is organised by Karin Everschor-Sitte and Christian Pfleiderer.
At the meeting of the DFG senate, the new collaborative research centre (Sonderforschungsbereich - SFB) on spin phenomena (Spin+X) was approved. The Sinova Group takes part in this large scale project which unites the 30 leading groups in spintronics and spin - related research from Physics, Chemistry and Engineering at Johannes Gutenberg University Mainz and the TU Kaiserslautern. The project is initially funded with 12 Mio. Euros for 4 years and can be extended up to 12 years.
For more information read the JGU press release.
Johannes Gutenberg University Mainz established the Gutenberg Research College in 2007 to highlight the university's academic strengths and to promote promising new research fields. Its main instrument is the granting of fellowships to excellent researchers from all disciplines. This year, the GRC welcomed four new fellows, with Jairo Sinova among them.
Our group will be joining the Schwerpunktprogramm SPP 1538 on spin-caloritronics.
In collaboration with Henning Sirringhaus (lead PI; Cambridge), Joerg Wunderlich (Cambridge and Prague), and Iain McCulloch (Imperial College) we will explore a new mergence of organic physics and chemistry with spintronic physics to achieve new ways of spin-charge conversion. For more information visit the ERC and the JGU press release here.
Jairo Sinova has been honored by the AvH Professorship award. This will see him relocate to Johannes Gutenberg Universität in Mainz, Germany as of January 2014. This new wonderful opportunity has been made possible by many friends at Mainz, particularly Prof. Mathias Kläui, and all over the world. A principal task that he will undertake is to establish a new kind of interdisciplinary center that focuses on bringing together new fields and disciplines researching spin-phenomena that are ready for a new level of interaction. The various press releases are here and here.
For information regarding the Alexander von Humboldt Professorship see here.