Spin Currents and Magnon Transport

Pure spin currents represent the charge-less transport of angular momentum. Our present research is focused on the injection, transport, and detection of magnon-based angular momentum transport in insulating, long-range ordered magnetic materials. We aim at the detailed understanding of spin transport and its precise control as the key ingredient for novel spin current-based devices.
Team
Matthias Althammer, Rudolf Gross, Stephan Geprägs, Matthias Opel, Hans Huebl, Monika Scheufele, Matthias Grammer, Fiona Sosa
Recent projects
Chiral phonons for spintronics
Hans Huebl, Stephan Geprägs, Matthias Opel, Matthias Althammer
Recent publications
Impact of growth conditions on magnetic anisotropy on the magnon Hanle effect in α-Fe2O3
Monika Scheufele, Janine Gückelhorn, Matthias Opel, Akashdeep Kamra, Hans Huebl, Rudolf Gross, Stephan Geprägs, Matthias Althammer
Research Article | APL Materials 11, 091115  (2023)
Preprint: arXiv:2306.00375
Observation of nonreciprocal magnon Hanle effect
Janine Gückelhorn, Sebastián de-la-Peña, Matthias Grammer, Monika Scheufele, Matthias Opel, Stephan Geprägs, Juan Carlos Cuevas, Rudolf Gross, Hans Huebl, Akashdeep Kamra, Matthias Althammer
Research Article | Physical Review Letters 130, 216703  (2023)
Preprint: arXiv:2209.09040
All-Electrical Magnon Transport Experiments in Magnetically Ordered Insulators
Matthias Althammer
Review | Physica Status Solidi (RRL) 15, 2100130  (2021)
Preprint: arXiv:2103.08996
Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures
Johanna Fischer, Matthias Althammer, Nynke Vlietstra, Hans Huebl, Sebastian T.B. Goennenwein, Rudolf Gross, Stephan Geprägs, Matthias Opel
Research Article | Physical Review Applied 13, 014019  (2020)
Preprint: arXiv:1907.13393
Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle Effect
Tobias Wimmer, Akashdeep Kamra, Janine Gückelhorn, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer
Research Article | Physical Review Letters 125, 247204  (2020)
Preprint: arXiv:2008.00440

Antiferromagnetic Spintronics

Antiferromagnetic materials promise improved performance for spintronic applications, as they are robust against external magnetic field perturbations and allow for faster magnetization dynamics as well as a higher packing density, compared to ferromagnets. The spin Hall magnetoresistance (SMR) effect is a versatile tool to probe the antiferromagnetic spin structure via simple electrical transport experiments. We investigate ...

  • the spin Hall magnetoresistance (SMR) effect in antiferromagnetic and altermagnetic insulators and
  • the topological Hall effect (THE) and related phenomena in materials with large spin-orbit coupling.

Magnon Spin Transport

Pure spin currents represent the chargeless transport of angular momentum. We investigate ...

  • the diffusive magnon spin transport in insulators with long-range magnetic order and
  • the spin texture and its evolution as a function of the external magnetic field.