Spintronik mit Antiferromagneten und Phononen (SHARP)

• Antragstellerin: Professorin Dr. Olena Gomonay
• Fachliche Zuordnung: Theoretische Physik der kondensierten Materie
• Förderung: Förderung von 2018 bis 2022
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 397322108

• Erstellungsjahr: 2023

Zusammenfassung der Projektergebnisse

The project SHARP was focused on bringing nonmagnetic – magnetoelastic effects into spintronics of antiferromagnets and using them for detection, manipulation and control of the magnetic textures. We demonstrated that magnetoelasticity plays a crucial role in formation and switching of the domain structure in antiferromagnetic materials. We showed that magnetoelastic coupling in combination with inhomogeneous thermal heating can be the leading mechanism of switching between different antiferromagnetic states. Thus, effective and reliable switching in antiferromagnets with the pronounced magnetoelastic coupling can be achieved by proper design of antiferromagnetic devices. We found that spontaneous strains define not only domain structure of antiferromagnetic devices, but also affect fast antiferromagnetic dynamics in a wide range of frequencies and time-scales. As an outcome of the project we developed a theoretical approach for calculation of statics and dynamics of real antiferromagnetic samples. Our findings open a way to systematic study of the magnetic textures in real samples with account of the geometry and materials combination, optimization of switching processes using additional stimulus (like stress and strain), indirect detection of antiferromagnetic ordering using magnetoelastic effects.

Projektbezogene Publikationen (Auswahl)

• Spin colossal magnetoresistance in an antiferromagnetic insulator. Nature Materials, 17(7), 577-580.
  Qiu, Zhiyong; Hou, Dazhi; Barker, Joseph; Yamamoto, Kei; Gomonay, Olena & Saitoh, Eiji
  
• Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures. Physical Review B, 97(1).
  Fischer, Johanna; Gomonay, Olena; Schlitz, Richard; Ganzhorn, Kathrin; Vlietstra, Nynke; Althammer, Matthias; Huebl, Hans; Opel, Matthias; Gross, Rudolf; Goennenwein, Sebastian T. B. & Geprägs, Stephan
  
• Anisotropies and magnetic phase transitions in insulating antiferromagnets determined by a Spin-Hall magnetoresistance probe. Communications Physics, 2(1).
  Lebrun, R.; Ross, A.; Gomonay, O.; Bender, S. A.; Baldrati, L.; Kronast, F.; Qaiumzadeh, A.; Sinova, J.; Brataas, A.; Duine, R. A. & Kläui, M.
  
• Mechanism of Néel Order Switching in Antiferromagnetic Thin Films Revealed by Magnetotransport and Direct Imaging. Physical Review Letters, 123(17).
  Baldrati, L.; Gomonay, O.; Ross, A.; Filianina, M.; Lebrun, R.; Ramos, R.; Leveille, C.; Fuhrmann, F.; Forrest, T. R.; Maccherozzi, F.; Valencia, S.; Kronast, F.; Saitoh, E.; Sinova, J. & Kläui, M.
  
• Propagation Length of Antiferromagnetic Magnons Governed by Domain Configurations. Nano Letters, 20(1), 306-313.
  Ross, Andrew; Lebrun, Romain; Gomonay, Olena; Grave, Daniel A.; Kay, Asaf; Baldrati, Lorenzo; Becker, Sven; Qaiumzadeh, Alireza; Ulloa, Camilo; Jakob, Gerhard; Kronast, Florian; Sinova, Jairo; Duine, Rembert; Brataas, Arne; Rothschild, Avner & Kläui, Mathias
  
• Direct Imaging of Current-Induced Antiferromagnetic Switching Revealing a Pure Thermomagnetoelastic Switching Mechanism in NiO. Nano Letters, 21(1), 114-119.
  Meer, Hendrik; Schreiber, Felix; Schmitt, Christin; Ramos, Rafael; Saitoh, Eiji; Gomonay, Olena; Sinova, Jairo; Baldrati, Lorenzo & Kläui, Mathias
  
• Efficient Spin Torques in Antiferromagnetic CoO/Pt Quantified by Comparing Field- and Current-Induced Switching. Physical Review Letters, 125(7).
  Baldrati, L.; Schmitt, C.; Gomonay, O.; Lebrun, R.; Ramos, R.; Saitoh, E.; Sinova, J. & Kläui, M.
  
• Spin Hall magnetoresistance in antiferromagnetic insulators. Journal of Applied Physics, 127(24).
  Geprägs, Stephan; Opel, Matthias; Fischer, Johanna; Gomonay, Olena; Schwenke, Philipp; Althammer, Matthias; Huebl, Hans & Gross, Rudolf
  
• Effective strain manipulation of the antiferromagnetic state of polycrystalline NiO. Applied Physics Letters, 118(17).
  Barra, A.; Ross, A.; Gomonay, O.; Baldrati, L.; Chavez, A.; Lebrun, R.; Schneider, J. D.; Shirazi, P.; Wang, Q.; Sinova, J.; Carman, G. P. & Kläui, M.
  
• Linear and nonlinear spin dynamics in multi-domain magnetoelastic antiferromagnets. Journal of Physics D: Applied Physics, 54(37), 374004.
  Gomonay, O. & Bossini, D.