Ovládání magnetického uspořádání v kompenzovaných kolineárních magnetických materiálech pro spintroniku

Zubáč, Jan

This thesis investigates the effective means of controlling magnetic order in compensated collinear magnetic materials relevant to spintronics. While traditional spintronic technologies primarily rely on uncompensated ferro- magnets, emerging compensated systems such as antiferromagnets and alter- magnets offer distinct advantages, including terahertz magnetization dynam- ics and the absence of stray fields. Altermagnets, in particular, combine these features with spin-polarized transport, opening new opportunities for device functionality. The work focuses on three representative systems: MnTe, CuMnAs, and Mn2As. In MnTe, manipulation of magnetic order by exter- nal magnetic fields revealed the anomalous Hall effect, establishing MnTe as a model altermagnet and extending this phenomenon beyond ferromag- nets and non-collinear antiferromagnets. In antiferromagnetic CuMnAs and Mn2As, a thermally induced quench switching of resistivity was identified as a novel means of controlling magnetic order via ultrashort optical or electrical pulses. The effect produces large resistive changes, and its energy efficiency and relation to atomically sharp 180◦ domain walls observed in CuMnAs were investigated. The demonstrated functionalities include ultrafast latency in- formation encoding and temporal pulse-pattern recognition....

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