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Magnons in ultrathin Fe/Co multi-layers on W(110) and Ir(111)

Tsurkan, Sergey

Abstract (englisch):
Probing the fundamental magnetic interactions in layered magnetic structures is
essential to the understanding of the properties of these systems. Such physical
quantities can be experimentally measured by probing the magnon dispersion
relation over the whole Brillouin zone. On this regard, high wavevector magnons
in ultrathin Fe and Co multilayers grown on W(110) and Ir(111) are studied using
spin polarized high resolution electron energy loss spectroscopy.
In layers of Fe and Co films deposited on W(110) the magnons are probed
along the [001] direction in the wavevector range of 0.25 inverse angstrom to 1.3 inverse angstrom.
Experimental results reveal two magnon modes which exhibit a clear dispersion as expected. The
results are described within the Heisenberg model. In the case of 1ML Co/1ML
Fe/W(110) structure, the interface Fe intralayer exchange coupling constants are
found to be enhanced when compared to 1ML Fe/W(110). The interlayer exchange
coupling was found to be weak (4.5 meV) relative to the 2ML Fe deposited on the
same substrate (7.6 meV). The antisymmteric Dzyaloshinskii-Moriya interaction
(DMI) was observed to be enhanced when compared to the 2ML Fe/W(110) system.
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Volltext §
DOI: 10.5445/IR/1000128888
Veröffentlicht am 08.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Hochschulschrift
Publikationsdatum 08.02.2021
Sprache Englisch
Identifikator KITopen-ID: 1000128888
Verlag Karlsruher Institut für Technologie (KIT)
Umfang 116 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Physikalisches Institut (PHI)
Prüfungsdatum 18.12.2020
Referent/Betreuer PD. Dr. K. Zakeri Lori
Schlagwörter Surface science, magnetism, Heisenberg, magnons, spin waves
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