News

A publication of Jairo Sinova, Libor Šmejkal and Thomas Jungwirth about altermagnetism, a  new nonrelativistic magnetic phase has been published in Physical Review X.

By the use of spin symmetries they predict a new nonrelativistic magnetic phase, namely altermagnetism. Altermagnets have zero net magnetization (like antiferromagnets) yet spin split electronic bands (like ferromagnets). Such materials are promising candidates for future spintronic devices which combile the advanteges from ferromagnets and antiferromagnets.

You can find the publication under PhysRevX.12.031042

A joint publication with Libor Šmejkal about the parity violations of the electronic structure in the antiferromagnet Mn2Au has been published in Journal of Physics: Condensed Matter.

They perform momentum resolved photemission on individual antiferromagnetic domains. The results show an asymmetry of the energy with respect to momentum. The responsible spin–orbit interaction couples the broken parity to the Néel order parameter direction. With this foundation they demonstrate a novel tool to image the Néel vector direction, N, by combining spatially resolved momentum microscopy with ab-initio calculations that correlate the broken parity with the vector.

You can find the publication under iopscience.iop.org/article/10.1088/1361-648X/ac87e6.

A joint publication with Helen Gomonay about  magnetoelastic effects at the interface of antiferromagnetic-ferromagnetic bilayers has been published in Physical Review B.

They show that surface acoustic waves at the interface of both magnets can be used to find complex magnetic textures.They are able to connect the magnetoelastic resonance to spin spirals in both layers.The reulst add to the emergent research in using noncollinear magnetism in spintronics devices.

You can find the publication under PhysRevB.105.144432.

A joint publication from the team in antiferromagnetic spintronics about anomalous Hall antiferromagnets has been published in Nature Reviews Materials.

They review and order the recent progress about the anoumalous Hall effect in antiferromagnets. They discuss the materials with the anomalous Hall effect form both a fundamental and applied view.

You can find the publication under nature.com/articles/s41578-022-00430-3.

A joint publication with Helen Gomonay about  ultrafast manipuation of antiferromagnets  has been published in Communications Physics.

They show a theoretical mechanism to imprint spin chirality into collinear antiferromagnets with the use of laser pulses. These pulses then can lead to quasi-stable ciral states. The results provide a more detailed  insight on the interactions between light and chiral magnetism.

You can find the publication under nature.com/articles/s42005-022-00840-3.

 

A publication from the team of antiferromagnetic spintronics about giant and tunneling magnetoresistance in unconventional collinear antiferromagnets has been published in Physical Review X.

They presentc archetype model mechanisms for the giant and tunneling magnetoresistance effects in multilayers of such materials. These mechanisms are linked to real materials through ab-initio calculations. Further they show how their models can allow for magnetic excitations by teh spin transfer torque.

You can find the publication under PhysRevB.12.011028.

A joint publication from the team of antiferromagnetic spintronics about domain walls driven by elastic defects has been published in Nature Communications.

They show that the domain structure in thin films of the antiferromagnet CuMnAs is dominated by elastic defects. These defects determine the location and orientation of 90° and 180° domain walls.The results show the impact of defects on the antiferromagnetic domain structure and provides a route to optimize the performance of devices.

You can find the publication under nature.com/articles/s41467-022-28311-x.

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.

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.