Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Multiferroics and Magnetoelectric Coupling (joint session MA/FM)
MA 17.4: Vortrag
Dienstag, 10. März 2026, 10:15–10:30, POT/0112
Investigation of the piezomagnetic effect in CaBaCo4O7 — •Jyotiranjan Rout1, Yusuke Tokunaga2, Yasujiro Taguchi2, Yoshinori Tokura2, Bernd Büchner1,3, and Vilmos Kocsis1 — 1IFW-Dresden — 2RIKEN, CEMS, Japan — 3TU-Dresden
In a magnetoelectric material the electric and magnetic responses are intertwined and cross control via the application of external magnetic and electric field are enabled. Ferroelectric polarization implies a special distortion of the lattice where dipolar moment related to the separation of the positive and negative ions are not compensated within the unit cell. Therefore we immediately can imagine the intricate and complicated connection between the magnetoelectric and magnetoelastic properties of a multiferroic.
The Swedenborgite CaBaCo4O7 exhibits a polar structure, which is accompanied by a ferrimagnetic order at TC=62 K and a record large change in the ferroelectric polarization. Correspondingly, former magnetoelastic measurements have indeed confirmed the presence of a giant magnetoelastic distortion close to TC; However, less is known about the magnetoelastic anisotropies.
Here, we report a detailed study of the magnetoelastic anisotropy, completing the connection between magnetoelasticity and magnetoelectricity in this material family. We also report on an unusual feature of the piezomagnetic effect, which suggests the importance of the orbitals in the piezomagnetoelectric effects.
Keywords: Spin orbit coupling; Multiferroic; Magnetolectricity; Piezomagnetism