Polarization Analysis of Microscopic Faraday Rotation of Thin Solid Ferrocene Aggregates

The Faraday rotation angles of ferrocene aggregates formed on a glass plate and a water surface were measured by a pulsed magnetic field Faraday-effect measurement system. The observed Faraday rotation of the aggregates showed a dependency on the incident polarization angle with a period of π/2, in contrast to the case of polarized absorption in the absence of a magnetic field, which gave a period of π. The polarization dependency of the Faraday rotation was analyzed in terms of the products of trigonometric functions with the angle of the transition moment of the ferrocene aggregate, inspired by the equations for the Faraday A and B terms. From the polarization angle dependencies in the presence and absence of pulsed magnetic fields, the differences in angles between the optical transition moment and the magneto-optical transition moment were evaluated, and they suggested that the ferrocene molecules in the aggregate formed on a glass plate were oriented more parallel to the horizontal glass surface than those in the aggregate formed on a water surface.