Research

01.02.2022 Joint Publication in antiferromagnetic spintronics

A joint publication of the Kläui - Lab together with Olena Gomonay and Jairo Sinova about magnon transport in weak antiferromagnets has been published in the Journal of Magnetism and Magnetic Materials. 

In more detail, they studied the antiferromagnet hematite with the Dzyaloshinskii-Moriya interaction (DMI). The results show that the DMI gives a new reconfigurability in the long distance magnon transport within thin films. This introduces a hysteresis in the system as a consequense of a competiotion of the Zeeman field and the effective field of the DMI.

You can find the publication under j.jmmm.2021.168631.

28.01.2022 Publication by Ricardo Zarzuela and Jairo Sinova

A publication by Ricardo Zarzuela and Jairo Sinova about the spin-charge transport theory and spin-transfer physics in frustrated magnets has been published in Physical Review B.

They present a new theory based on the doped Hubbard model and the slave-boson formalism. The results of their work point towards possible new Hall physics thhat was previously unanticipated  in the studied frustrated materials.

You can find the publication under PhysRevB.105.024423.

12.01.2022 Joint publication with Jairo Sinova

A joint publication of the London Centre for Nanotechnology and the Catalan Institute of Nanoscience and Nanotechnology together with Jairo Sinova about Van der Waals layered systems has been published in Nature Reviews Physics.

They present fundamentals on van der Waals magnetism and spin–orbit coupling effects in 2D systems. It is discussed how the coexistance of both effects could establish new ways to engineer robust spin textures. The results will help in designing future non-volatile memory devices that utilize the unique properties of 2D materials.

You can find the publication under nature.com/articles/s42254-021-00403-5.

04.06.2020 New Science Advance publication on the prediction of the Crystal Hall effect.

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.

https://advances.sciencemag.org/content/6/23/eaaz8809

01.06.2020 – CRC TRR288 Elastoqmat funded by the DFG

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

https://www.uni-mainz.de/presse/aktuell/11474_DEU_HTML.php

 

Posted on | Posted in Research

19.12.2017 – Olena Gomonay receives DFG grant

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.

20.11.2015 – New Collaborative Research Center on Spin Phenomena approved by DFG

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.

Posted on | Posted in Research

27.05.2014 – Sinova becomes a Gutenberg Research Fellow

GFK_gutenberg_research_award_2014_gruppenbild_klein

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.

Posted on | Posted in Research