Research

17.10.2022 Joint Publication about Spin Transport in Antiferromagnets

A joint publication with Jairo Sinova and Libor Šmejkal about spin transport in the canted antiferromagnet YFeO3 has been published in Nature Communications.

They report long range spin transport in YFeO3 by a transport mechanism that is combined from the Dzyaloshinskii-Moriya interaction and externally applied fields. The decay length of spin waves is determined to be hundreds of nanometers and is strongly anisotropic. This result opens the possibility to use the large class of canted antiferromagnets in the technologically relevant field of long range spin transport.

You can find the publication under nature.com/articles/s41467-022-33520-5.

26.09.2022 Joint Publication about Magnetoelastic Antiferromagnets

A joint publication with Helen Gomonay about shape dependent magnetoelastic effects in the antiferromagnet NiO has been published in Physical Review B.

They demonstrate that the antiferromagnetic order in NiO/Pt films can be manipulated via strains. Experiments guided by theoretical models suggest that shape dependent strains require special attention in the design of antiferromagnetic devices.

You can find the publication under PhysRevB.106.094430.

23.09.2022 Publication about Altermagnetism

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

26.08.2022 New joint publication in spintronics

A joint publication with Helen Gomonay about noncollinear spin currents for switching of chiral magnetic textures has been published in PRL.

They demonstrate the combined generation of broadband and narrowband magnons in thin films of NiO/Pt. They present two excitation processes which both lead to the emmision of THz signals. These results open new routes towards the development of fast opto-spintronic devices based on antiferromagnetic materials.

They propose a concept of noncollinear spin current, whose spin polarization varies in space even in nonmagnetic crystals.  Moreover, by referring to atomistic spin dynamics simulations they show that noncollinear spin currents can be used to switch the chiral spin texture of Mn3X in a deterministic way even in the absence of an external magnetic field. Their theoretical prediction can be readily tested in experiments, which will open a novel route toward electric control of complex spin structures in noncollinear antiferromagnets.

You can find the publication under Phys. Rev. Lett. 129, 097204.

18.08.2022 Joint Publication about the electron structure in Mn2Au

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.

26.04.2022 Joint Publication about antiferromagnetic spintronics

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.

30.03.2022 Joint Publication about antiferromagnetic spintronics

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.

25.03.2022 Joint publication about antiferromagnetic spintronics

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.

10.02.2022 Publication about Unconventional Antiferromagnets

 

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.

07.02.2022 Joint publication about antiferromagnetic spintronics

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.