Optická a magnetooptická spektroskopie materiálů s antiferomagnetickou interakcí

Križanová, Katarína

Title: Optical and magneto-optical spectroscopy of materials with antiferro- magnetic interaction Author: Bc. Katarína Križanová Department: Institute of Physics of Charles University Supervisor: RNDr. Jakub Zázvorka, Ph.D., Institute of Physics of Charles University Abstract: One of the goals of spintronic research is the efficient external con- trol of magnetic moment. Non-collinear antiferromagnets in the antiperovskite structure, such as Mn3NiN, show a piezomagnetic effect that can be used to utilize these materials in applications. In the strain free state, the material ex- hibit zero net magnetic moment. Using strain induced by a lattice constant mismatch between the thin layer and a substrate on which the thin film is applied on a non-zero net magnetic moment can be registered. Magneto-optical Kerr effect spectroscopy is used to investigate the non-collinear magnetic thin films. The effect of two substrate layers with resulting opposite sign of strain influencing the magnetic ordering of the antiperovskite material is studied with respect to sample temperature. Results show comparable spectral dependence with opposite sign of the Kerr effect caused by the opposite direc- tion of net magnetization moments. Ellipsometry measurements depending on sample orientation are performed to study the material...

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