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Magnetism & Spintronics: Spin Currents and Spin Transport

 

SMR (png, 31k)

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 compared to ferromagnets. The direct observation of the antiferromagnetic state, however, is challenging due to the absence of a macroscopic magnetization. The spin Hall magnetoresistance (SMR) effect, however, 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 insulators,
  • the antiferromagnetic spin texture and its evolution as a function of the external magnetic field, and
  • the spin-transport in antiferromagnetic insulators via the the magnon-mediated magnetoresistance (MMR).
   
Recent publications

Spin Hall magnetoresistance in antiferromagnetic insulators
Stephan Geprägs, Matthias Opel, Johanna Fischer, Olena Gomonay, Philipp Schwenke, Matthias Althammer, Hans Huebl, Rudolf Gross
Journal of Applied Physics 127, 243902 (2020)

 

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
Physical Review Applied 13, 014019 (2020)

 

Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures
Johanna Fischer, Olena Gomonay, Richard Schlitz, Kathrin Ganzhorn, Nynke Vlietstra, Matthias Althammer, Hans Huebl, Matthias Opel, Rudolf Gross, Sebastian T.B. Goennenwein, Stephan Geprägs
Physical Review B 97, 014417 (2018)

  

 

SMR (png, 31k)

Spin Transport and Magnon-Mediated Magnetoresistance

Pure spin currents represent the chargeless transport of angular momentum. They give rise to novel interface effects like the recently discovered spin Hall magnetoresistance. We investigate ...

  • the spin transport and the spin Hall magnetoresistance (SMR) effect in materials wit long-range magnetic order,
  • non-local effects and magnon-mediated magnetoresistance (MMR), and
  • the topological Hall effect (THE) and related phenomena in materials with large spin-orbit coupling.
   
Recent publications

Spin Transport in a Magnetic Insulator with Zero Effective Damping
Tobias Wimmer, Matthias Althammer, Lukas Liensberger, Nynke Vlietstra, Stephan Geprägs, Mathias Weiler, Rudolf Gross, Hans Huebl
Physical Review Letters 123, 257201 (2019)

 

Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device
Tobias Wimmer, Birte Coester, Stephan Geprägs, Rudolf Gross, Sebastian T. B. Goennenwein, Hans Huebl, Matthias Althammer
Applied Physics Letters 115, 092404 (2019)

 

Pure spin currents in magnetically ordered insulator/normal metal heterostructures
Matthias Althammer
J. Phys. D: Appl. Phys. 51, 313001 (2018)

 

 

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