Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 53: Spin Structures at Surfaces and in thin films II
MA 53.7: Vortrag
Freitag, 4. April 2014, 11:00–11:15, BEY 118
Reduced dimensionality induced magnetic stripe phase in Fe nanoislands — •Soo-hyon Phark1, Jeison Fischer1,2, Marco Corbetta1, Dirk Sander1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2Universidade Federal de Santa Catarina , Florianópolis, Brazil
Low-dimensionality in itinerant magnetic materials often leads to magnetic ground states of non-collinear magnetic order [1], such as spin helices and skyrmions. Recent theoretical works predicted that competing exchange interactions induce a spin helix in bcc Fe(110) monolayers [2]. Here we report an observation of a magnetic stripe phase with a period of 1.28 nm in bilayer Fe nanoislands on Cu(111) [3]. In-field spin-polarized scanning tunneling microscopy and spectroscopy reveal that the stripe phase originates from a helical spin ordering. Together with theoretical insights [2], our finding provides compelling experimental evidence that a non-collinear magnetic ordering can be stabilized in a system where a long-range antiferromagnetic exchange interaction is enhanced due to a reduced dimensionality.
[1] S. Mühlbauer, B. Binz, F. Jonietz, C. Pfleiderer, A. Rosch, A. Neubauer, R. Georgii, P. Böni, Science 323, 915 (2009). [2] K. Nakamura, N. Mizuno, T. Akiyama, T. Ito, A. Freeman, J. Appl. Phys. 99, 08N501 (2006). [3] A. Biedermann, W. Rupp, M. Schmid, P. Varga, Phys. Rev. B 73, 165418 (2006).