Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Spin dynamics and transport

MA 26.2: Talk

Wednesday, April 3, 2019, 09:45–10:00, H37

Analysis of the spin transfer torques as a function of domain wall length — •Hamidreza Kazemi¹, Bertrand Dupé², Nicholas Sedlmayr³, Imke Schneider¹, Jairo Sinova², and Sebastian Eggert¹ — ¹Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — ²Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany — ³Department of Physics and Medical Engineering, Rzeszów University of Technology, Rzeszów, Poland

Use of a spin polarized current for the manipulation of magnetic domain walls in ferromagnetic nanowires has been the subject of intensive research for many years. Recently, due to technological advancements creating nano-contact with special characteristics are becoming more and more prevalent. Our goal is to delve into the full quantum investigation of the behavior of the spin transfer torques in a nano-contact of Ni₈₀Fe₂₀. According to our DFT calculations the physical behavior of low energies can be described by the s-d model which couples the domain wall and the itinerant electrons. To investigate spin transfer torques, we solve the scattering problem of a noninteracting tight-binding Hamiltonian including an s-d term. Moreover, the resulting magnetoresistance is calculated and compared with experiments.