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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Optical spectroscopy of antiferromagnets
 Kimák, Jozef ; Němec, Petr (advisor) ; Tesařová, Naďa (referee)
Antiferromagnets, magnetically ordered materials without macroscopic magnetization, are rather difficult to study by conventional magnetic characterization tools. This thesis was focus on optical research of antiferromagnets. We studied in detail magneto-optical effects quadratic in magnetization, magnetic linear dichroism and Voigt effect, that are present even in compensated antiferromagnets. We studied magnetic semiconductor (Ga,Mn)As where these effects are rather pronounced and by employing a 2-dimensional electromagnet, we demonstrated that these effects can be used for a determination of magnetic and magneto-optical anisotropy in investigated materials. Alternative approach was used in a thin film made from a non-collinear antiferromagnet Mn3NiN where we studied changes of optical and magneto-optical properties. We revealed that they are strongly affected by the strain connected with the temperature-induced phase transition in the STO substrate. This demonstrates that optical spectroscopy can be used for the research of antiferromagnets quite efficiently.
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Characterization of two-dimensional electromagnet
 Kimák, Jozef ; Němec, Petr (advisor) ; Olejník, Kamil (referee)
Abstract:In this work we studied magnetic field magnitude and direction ge- nerated by a prototype of 2-dimensional electromagnet, which was recently cons- tructed in Laboratory of the OptoSpintronics. This electromagnet is formed by two pairs of coils with a mutually perpendicular position of their poles. In parti- cular, we revealed that, by appropriately setting the current through the coils, it is possible to rotate reproducibly the field direction in the plane of the poles for the field magnitude of about 200 mT. We also observed that the generated field is rather homogeneous in a region with a radius of about 5 mm, which corresponds to a typical sample size. On the other hand, the functionality of the electromag- net at lower fields could not be tested unambiguously due to technical problems with a home-made detection Hall probes. This problem will be addressed in the following work. 1
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