SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Poster Session VII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces III
O 95.6: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
Probing magnetic excitation of a spin spiral — •Hung-Hsiang Yang1, Masayuki Hamada2, Yasuo Yoshida3, and Yukio Hasegawa2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, Karlsruhe, 76131, Germany — 2Institute for Solid State Physics, University of Tokyo, 5-1-5, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan — 3Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
Magnetic excitation due to inelastic electron scattering plays a crucial role in spintronics devices concerning the spin lifetime of polarized electrons and the amount of spin transfer torque for switching magnetic configurations in magnetic tunnel junctions. One of the fundamental processes is magnon creation, which occurs when injected hot electrons induce spin-flip scattering of the magnetic material. To image and address the magnetic origin of the excitations, we have performed low-temperature spin-polarized inelastic electron tunneling spectroscopy (IETS) on double layer Mn thin films formed on W(110) substrate.
The atomically-thin magnetic layer exhibits a homogeneous spin spiral with antiferromagnetic coupling, which provides a good reference for spin-polarized scanning tunneling microscopy (STM). Characteristic peak-dip features in IETS, as well as their correlation with the spin spiral, are acquired. Additionally, we have observed contrast reversal in the IETS intensity when the tip magnetization direction is flipped, indicating that the excitation is spin-dependent and thus presumably due to magnon creation.