Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.8: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster C

Magnetic anisotropy and anisotropic critical fields in MnSi and Fe_1−xCo_xSi — •Gilles Gödecke, Julius Grefe, Stefan Süllow, and Dirk Menzel — Institut für Physik der Kondensierten Materie, TU Braunschweig, Mendelssohnstr.3, 38106 Braunschweig, Germany

The itinerant B20 bulk magnets MnSi and Fe_1−xCo_xSi are known to host chiral spin structures and magnetic skyrmions arising from competing magnetic interactions including magnetic anisotropy. We report on the measurement of the magnetic anisotropy constants for MnSi and Fe_1−xCo_xSi (0.08 ≤ x ≤ 0.30) using angle-resolved magnetisation measurements in a commercial SQUID magnetometer. From the measurements, we have identified the angle dependence of the critical fields H_C1 and H_C2. Whereas both H_C1 and H_C2 for MnSi are maximal along the hard axis, the behavior of H_C1 is opposite for Fe_1−xCo_xSi. The values of the anisotropy constants at T = 5 K are K = −12× 10² J/m³ for MnSi and K = (2...6)× 10² J/m³ for Fe_1−xCo_xSi.

Keywords: chiral magnets; skyrmions; magnetic anisotropy