Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.28: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Magnetic and transport properties of compensated ferrimagnetic Heusler alloys at finite-temperature predicted by ab inito spin fluctuation theory — •Shogo Yamashita¹, Esita Pandey¹, Gerhard Fecher¹, Claudia Felser¹, and Atsufumi Hirohata^1,2 — ¹Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany. — ²Center for Science and Innovation in Spintronics, Tohoku University, Sendai, Japan

Fully compensated ferrimagnets have been attractive for spintronics because their net zero magnetization suppresses stray fields, enabling high-density memory integration. Among them, Heusler alloys which have 24 valence electrons are of particular interest since they can exhibit both half-metallicity with 100 % spin polarization at the Fermi level and fully compensated ferrimagnetism. However, a fully compensated half metallic Heusler alloy Mn_1.5V_0.5FeAl reported previously has a Curie temperature below room temperature, limiting its device applications. To find alternatives, we investigated Mn₂Co_0.5V_0.5Al(Ga), which is regarded as a mixture of half-metallic Mn₂VAl(Ga) and Mn₂CoAl(Ga) exhibiting high Curie temperature, with 24 valence electrons. Using an ab inito spin-fluctuation theory based on the coherent potential approximation and disordered local moments, we examined its electronic structure, magnetic properties, and spin conductivities at finite-temperature. In this presentation, we will also discuss possible future control in the properties.

Keywords: Spintronics; Ferrimagnetism; First principles calculations; Coherent potential approximation; Linear response thoery