Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Magnetization / Demagnetization Dynamics II

MA 14.2: Vortrag

Montag, 20. März 2017, 15:15–15:30, HSZ 401

Temperature-dependent Mueller matrix measurements of the optical constants of Ni near the Curie temperature — Farzin Abadizaman, Jaime M. Moya, and •Stefan Zollner — New Mexico State University, Las Cruces, NM, USA

Previous ellipsometry measurements (S. Zollner et al., Appl. Surf. Sci.  in print) of the pseudo-dielectric function of bulk and thin-film Ni at 1.96 eV as a function of temperature reported a discontinuity near the Curie temperature while heating the sample from 80 to 800 K. The discontinuity disappeared when cooling the sample. Our previous experiments were unable to distinguish between the off-diagonal response (magneto-optical Kerr effect) and the on-diagonal response (Drude conductivity and interband transitions). We therefore performed more advanced temperature dependent ellipsometry measurements to determine the Mueller matrix response of bulk and thin-film Ni. We also carried out control measurements on a Ni:V alloy (which is not ferromagnetic for a sufficiently large V content) and other materials to determine the systematic and random errors of the Mueller matrix elements using our J.A. Woollam variable-angle-of-incidence (VASE) ellipsometer.