Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Surface Magnetism 2 (Joint Session with O)

MA 49.6: Vortrag

Donnerstag, 23. März 2017, 11:00–11:15, HSZ 401

Control of helical spin order in Fe nanoislands — •Jeison A. Fischer, Leonid Sandratskii, Dirk Sander, and Stuart Parkin — Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany.

An exchange driven helical spin order has been revealed for Fe bilayer islands on Cu(111 [1]. The driving force for the existence of the spin helix with a period of 1.28 nm has been attributed to the competition between ferro- and antiferromagnetic interactions due to the reduced dimensionality of the Fe bilayer islands [1]. Mechanisms to control the non-collinear spin order via lateral confinement with ferromagnet and vacuum interfaces has been demonstrated [2]. Here we report an alternative form to control the magnetic spin order in Fe nanoislands by changing the Fe thickness. Spin-polarized scanning tunneling microscopy and spectroscopy reveals a magnetic stripe phase with a period of 2.3 nm in trilayer Fe nanoislands on Cu(111) [3]. The change in period represents an increase of 80% from bilayer to trilayer systems. Together with theoretical insights, we discuss our finding in view of the role of the layerwise dependence of the exchange interactions acting in the system.

[1] S.-H. Phark, J.A. Fischer, M. Corbetta, D. Sander, K. Nakamura, J. Kirschner, Nat. Commun. 5:5183 doi:10.1038/ncomms6183 (2014).

[2] J.A. Fischer, L.M. Sandratskii, S.-H. Phark, S. Ouazi, A. A. Pasa, D. Sander, S.S.P. Parkin, Nat. Commun. 7, 13000 doi: 10.1038/ncomms13000 (2016).

[3] A. Biedermann, W. Rupp, M. Schmid, P. Varga, Phys. Rev. B 73, 165418 (2006).