2013/07/02 by Soo‐hyon Phark, Jeison A. Fischer, Phark, Soo-hyon +7 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Surface and Thin Film Phenomena
paper · pdf · doi:10.48550/arxiv.1307.0591
openalex publication_date 2013/07/02 · openalex created_date 2022/10/05 · openalex updated_date 2026/07/28
We performed spin-polarized scanning tunneling spectroscopy on\nbiatomic-layer-high Co nanoislands grown on Cu(111) in magnetic fields oriented\nnormal to the sample surface, with Fe-coated W tips. Increasing the temperature\nfrom 10 to 30 K, we observe a reduced slope of the differential conductance\naround zero field. A quantitative analysis of the field- and\ntemperature-dependent differential conductance data in the framework of\nsuperparamagnetism as described by a Langevin function gives an excellent\ndescription of the experimental results. The analysis suggests that a Fe\nnano-apex at the W tip, which is composed of 220-300 Fe atoms, determines the\nmagnetic response of the tip.\n