STM Observations of Ferromagnetic Clusters |
| A. Wawroa,b and A. Kasuyaa aInstitute for Materials Research, Tohoku University, 2-1-1 Katahira, 980 Sendai, Japan bInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland |
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| Co, Fe and Ni clusters of nanometer size, deposited on silicon and graphite (highly oriented pyrolytic graphite), were observed by a scanning tunneling microscope. Deposition as well as the scanning tunneling microscope measurements were carried out in an ultrahigh vacuum system at room temperature. Detailed analysis of Co cluster height was done with the scanning tunneling microscope equipped with a ferromagnetic tip in the magnetic field up to 70 Oe. It is found that bigger clusters (few nanometers in height) exhibit a dependence of their apparent height on applied magnetic field. We propose that such behaviour originates from the ferromagnetic ordering of cluster and associate this effect to spin polarized tunneling. |
| DOI: 10.12693/APhysPolA.93.443 PACS numbers: 34.80.Nz, 36.40.Cg, 61.16.Ch |