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