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Compensated Magnets - Properties & Advanced Spintronics (COMPASS)

 

Wir sind eine Spintronik-Forschungsgruppe, die sich auf kompensierte magnetische Materialien konzentriert – von kollinearen und nicht-kollinearen Antiferromagneten bis hin zu neuartigen Altermagneten.

 

Kompensierte Magnete wie Antiferromagnete und Altermagnete besitzen großes technologisches Potenzial, da sie ultraschnelle THz Spin-Dynamik, hohe Robustheit und nichtflüchtiges, neuron-ähnliches Schalten ermöglichen. Ihre magnetische Ordnung ist jedoch kaum zugänglich, da die alternierende Spinstruktur keine makroskopische Magnetisierung erzeugt. Relativistische Spin-Bahn-Effekte eröffnen aber möglicherweise Wege, diese Ordnung elektrisch anzuregen, zu manipulieren und auch auszulesen. Die Forschung in unserer Gruppe klärt die zugrunde liegenden mikroskopischen Mechanismen und entwickelt daraus energieeffiziente, extrem schnelle und neuartige Logik- und Speicherkonzepte.

News and Highlights

  • Terahertz and DC nonlinear transport in twisted graphene and van der Waals hetero-structures

    Recently approved, our new project focus on nonlinear transport phenomena excited by terahertz radiation in twisted bilayer graphene and in 2D transition metal dichalcogenide / graphene bilayer heterostructures. Within this project, we will demonstrate that nonlinear transport can be used as a new and powerful method to access and characterize electronic and spin properties in 2D materials.


    Link to the project in grepis (externer Link, öffnet neues Fenster)

  • DFG-funded Cluster of Excellence “Center for Chiral Electronics” (CCE) 

    The DFG-funded Cluster of Excellence “Center for Chiral Electronics” (CCE) brings together leading researchers from physics and chemistry in Halle (Saale), Berlin, and Regensburg.  CCE will explore the unique potential of chirality in solid-state and molecular systems to develop next-generation electronic technologies.


    CCE webpage (externer Link, öffnet neues Fenster)

Terahertz and DC nonlinear transport in twisted graphene and van der Waals hetero-structures

Recently approved, our new project focus on nonlinear transport phenomena excited by terahertz radiation in twisted bilayer graphene and in 2D transition metal dichalcogenide / graphene bilayer heterostructures. Within this project, we will demonstrate that nonlinear transport can be used as a new and powerful method to access and characterize electronic and spin properties in 2D materials.


Link to the project in grepis (externer Link, öffnet neues Fenster)

DFG-funded Cluster of Excellence “Center for Chiral Electronics” (CCE) 

The DFG-funded Cluster of Excellence “Center for Chiral Electronics” (CCE) brings together leading researchers from physics and chemistry in Halle (Saale), Berlin, and Regensburg.  CCE will explore the unique potential of chirality in solid-state and molecular systems to develop next-generation electronic technologies.


CCE webpage (externer Link, öffnet neues Fenster)

SFB 1277 - Collaborative Research Center

We contribute to the Collaborative Research Center SFB 1277 through two projects: Project B12 investigates magnetic photocurrents in PT-symmetric antiferromagnets, while Project C02 focuses on time-resolved imaging of antiferromagnetic dynamics.


 SFB webpage (externer Link, öffnet neues Fenster)

Antiferromagnetic Neuromorphic Memory (externer Link, öffnet neues Fenster)

We showed the experimental realization of a nonvolatile antiferromagnetic memory mimicking an artificial synapse, in which the reconfigurable synaptic weight is encoded in the ratio between reversed antiferromagnetic domains. The non-volatile memory is “written” by spin-orbit torque-driven antiferromagnetic domain wall motion and “read” by nonlinear magnetotransport.


 https://www.nature.com/articles/s44306-024-00027-2 (externer Link, öffnet neues Fenster)

Ultrashort spin-orbit torque induced by femtosecond laser pulses (externer Link, öffnet neues Fenster)

We demonstrate ultrashort spin–orbit torque pulses at an epitaxial Fe/GaAs interface by converting femtosecond laser pulses into high-amplitude current pulses in a biased p-i-n photodiode. This approach enables sub-picosecond current generation, offering a powerful platform to study ultrafast excitation and switching of magnetic order in metallic antiferromagnets.


https://www.nature.com/articles/s41598-022-24808-z (externer Link, öffnet neues Fenster)

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