| The magnetic properties of thin films modified by exposure to vapor phase organic molecules were investigated and show that virtually any functional group measurably changes the magnetic properties of the surface. The effect often scales with ligand strength and is not limited to ferromagnetic surface materials. A stable and sensitive device was developed to measure the magnetic effect through the planar Hall voltage and was applied to the controversial question of purported paramagnetism in thiolated gold. There is a measureable non-diamagnetic response of thin gold layers when exposed to alkanethiols as well as other ligands such as alcohols, carboxylic acids, amines, and ketones.;This approach is not susceptible to contamination by external magnetically active material, unlike many of the previous measurements of anomalous gold-thiol magnetism, as significant effort was devoted to verify. The constructed analysis system, the magnetic resonance measurement system (MaRMS), is stable, highly sensitive, and flexible. Combined with the positive results and simple theoretical explanation, a door has been opened to a wide variety of further investigation of magneto-chemical surface phenomena. |
