Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.137: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Magneto-optical Kerr effect of DyS and EuTe — •P. Clodius, M. Marutzky, and J. Schoenes — Institut für Physik der Kondensierten Materie und Hochmagnetfeldanlage, TU Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig

DyS is a metallic antiferromagnet with a Néel temperature T_N=40K which crystallises in the rocksalt structure. Dy³⁺ has the electronic configuration 4f⁹, leading to a saturation moment of 10µ_B. Many of the rare earth sulfides have been investigated, e.g. NdS in which large magneto-optical effects have been found. In contrast, DyS has not been studied with magneto-optical methods yet.
The rare earth chalcogenide EuTe is a magnetic semiconductor (E_g=2,0eV). It is an antiferromagnet (T_N=9,6K) and has also rocksalt structure. The Eu²⁺ ground state (4f⁷, ⁸S_7/2) leads to a large saturation moment of 7µ_B. The Faraday effect of EuTe has been extensively studied [1] but the magneto-optical Kerr effect of EuTe has not been measured yet.
The complex Kerr effect of DyS will be shown as well as the optical conductivity and the off-diagonal elements of the optical conductivity.
A Drude-Lorentz model will be fitted to get quantitative statements about the electronic structure of DyS.
First results of measurements of the magneto-optical-Kerr effect of EuTe will be presented.

[1] J.Schoenes, Z. Physik B 20. 345-368 (1975)