High-entropy alloys (HEAs) are materials composed of five or more main elements in approximately equimolar ratios. Due to the high configurational entropy of the mixture, they exhibit a unique combination of mechanical, chemical, and magnetic properties. This thesis first presents the theoretical foundations of high-entropy alloys, followed by an overview of the basic concepts of magnetism. The central part of the thesis addresses the magnetic properties of high-entropy alloys. For soft magnetic alloys, primarily based on the Fe-Co-Ni system, the various effects of the selection and concentration of alloying elements on the properties of the alloys are demonstrated. For hard magnetic alloys, systems with and without rare-earth elements are discussed, along with the fundamental mechanisms of hard magnetism. Special attention is also given to the magnetocaloric effect. The concluding section presents actual and potential applications, along with a comparison of the advantages and disadvantages relative to classical magnetic materials. The findings indicate that high-entropy alloys represent a promising, though still largely experimental, alternative to conventional magnetic materials, with potential for reducing dependence on rare-earth elements.
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