New insights into nanomagnetism: spin-polarized scanning tunneling microscopy and spectroscopy studies

Hirofumi Oka; Guillemin Rodary; Sebastian Wedekind; Pavel A. Ignatiev; Larissa Niebergall; Valeri S. Stepanyuk; Dirk Sander; Jürgen Kirschner

doi:10.1117/12.892459

15 September 2011 New insights into nanomagnetism: spin-polarized scanning tunneling microscopy and spectroscopy studies

Hirofumi Oka, Guillemin Rodary, Sebastian Wedekind, Pavel A. Ignatiev, Larissa Niebergall, Valeri S. Stepanyuk, Dirk Sander, Jürgen Kirschner

Author Affiliations +

Proceedings Volume 8100, Spintronics IV; 81000O (2011) https://doi.org/10.1117/12.892459
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

Abstract

We perform low-temperature spin-polarized scanning tunneling microscopy (SP-STM) and spectroscopy measurements in magnetic fields to gain new insights into nanomagnetism. We use the magnetic field to change and control magnetizations of a sample and a magnetic tip, and measure the magnetic hysteresis loops of individual Co nano-islands on Cu(111). We also exploit the high spatial resolution of SP-STM in magnetic fields to measure maps of the differential conductance within a single Co nano-island. In connection with ab initio calculations, we find that the spin polarization is not homogeneous but spatially modulated within the nano-island. We ascribe the spatial variation of the spin polarization to spin-dependent electron confinement within the Co nano-island.

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Hirofumi Oka, Guillemin Rodary, Sebastian Wedekind, Pavel A. Ignatiev, Larissa Niebergall, Valeri S. Stepanyuk, Dirk Sander, and Jürgen Kirschner "New insights into nanomagnetism: spin-polarized scanning tunneling microscopy and spectroscopy studies", Proc. SPIE 8100, Spintronics IV, 81000O (15 September 2011); https://doi.org/10.1117/12.892459

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