Abstract
Novel magnetic properties of very small nanostructures have attracted broad interests in the fields of nanoscience and nanotechnology. The magnetic stability of such nanostructures relies on the magnetic anisotropy and magnetization dynamics. These properties were investigated for single Co atoms on Pt(111) using low-temperature scanning tunneling microscopy. The atomic manipulation capabilities of scanning tunneling microscopy allow to extend the study to Co dimers. Information on the magnetic anisotropy and lifetime of magnetically excited states of single atoms and dimers was achieved simultaneously with inelastic tunneling spectroscopy. Manufactured dimers consist of adatoms in nearest-neighbor fcc-hcp sites. For adatoms this close, a strong direct exchange interaction of 14 meV/h2 was found, much larger than the weak long-range indirect Ruderman-Kittel-Kasuya-Yoshida interaction. [DOI: 10.1380/ejssnt.2011.237]
Highlights
We present results on the magnetic anisotropy as well as the magnetization dynamics of single atoms and dimers by inelastic tunneling spectroscopy (ITS) using a low-temperature scanning tunneling microscope (STM)
The effective spin model is used for inelastic tunneling spectroscopy (ITS) [3]
In X-ray magnetic circular dichroism (XMCD), often a description of the magnetic anisotropy energy (MAE) is used where it is linked to only L [4]
Summary
Modification of Magnetic Stability of Co Single Atoms on Pt(111) by Dimer Formation∗. Schuh Physikalisches Institut, Karlsruher Institut fur Technologie, 76131 Karlsruhe, Germany. W. Wulfhekel Physikalisches Institut, Karlsruher Institut fur Technologie, 76131 Karlsruhe, Germany (Received 2 November 2010; Accepted 19 May 2011; Published 4 June 2011). The magnetic stability of such nanostructures relies on the magnetic anisotropy and magnetization dynamics. These properties were investigated for single Co atoms on Pt(111) using low-temperature scanning tunneling microscopy. Manufactured dimers consist of adatoms in nearest-neighbor fcc-hcp sites. For adatoms this close, a strong direct exchange interaction of 14 meV/ħ2 was found, much larger than the weak long-range indirect Ruderman-Kittel-Kasuya-Yoshida interaction.
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