Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Spin Structures at Surfaces and in thin films I (Skyrmions)

MA 45.6: Vortrag

Donnerstag, 3. April 2014, 16:15–16:30, BEY 118

In situ conversion electron Mössbauer spectroscopy on ultrathin Fe(100)/Ir(100) films — •Sergey Makarov^1,2, Werner Keune^1,2, Heiko Wende¹, and Jürgen Kirschner² — ¹Fakultät für Physik und CeNIDE, Universität Duisburg-Essen — ²Max-Planck-Institut für Mikrostrukturphysik Halle

In the present work we apply ⁵⁷Fe conversion electron Mössbauer spectroscopy for the study of magnetic order in uncoated three- and four-atomic monolayers (ML) thick epitaxial ⁵⁷Fe(100) ultrathin films grown in ultrahigh vacuum by molecular - beam epitaxy on the Ir(100) surface with the (5x1)Hex reconstruction. The spectra were taken in situ in UHV in zero external magnetic field at 30 K using a channeltron electron detector.

These spectra of 3 and 4 ML ⁵⁷Fe on Ir(100)-(5x1)Hex reveal magnetic order even at 30 K. Surprisingly, the measured CEM spectra indicate two inequivalent ⁵⁷Fe sites. Moreover, for 3 ML ⁵⁷Fe we obtain the average angle between the hyperfine field direction and γ-radiation, which shows a strong out-of-plane component of Fe spin orientation. In contrast, a preferred in-plane Fe spin alignment for 4 ML ⁵⁷Fe/Ir(100)-(5x1)Hex was observed.