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MA: Fachverband Magnetismus
MA 45: Magnonics I
MA 45.7: Vortrag
Donnerstag, 19. März 2020, 11:15–11:30, HSZ 401
Probing magnetic excitation by spin-polarized scanning tunneling microscopy — •Hung-Hsiang Yang1, 2, Masayuki Hamada1, Yasuo Yoshida1, and Yukio Hasegawa1 — 1Institute for Solid State Physics, 5-1-5, Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan — 2Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, Karlsruhe, 76131, Germany
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 feature in IETS, as well as its 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. The spatial distribution of the magnon excitation and its energy dependence will be discussed in the presentation.