Magnetocaloric effect for the topological semimetal Co$_3$Sn$_2$S$_2$ due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases

N. N. Orlova; V. D. Esin; A. V. Timonina; N. N. Kolesnikov; E. V. Deviatov

doi:10.1016/j.jmmm.2025.172998

paper

Magnetocaloric effect for the topological semimetal Co $_{3}$ Sn $_{2}$ S $_{2}$ due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases

arXiv:2410.05138 · doi:10.1016/j.jmmm.2025.172998

Abstract

We experimentally investigate magnetocaloric effect for the topological magnetic Weyl semimetal Co $_{3}$ Sn $_{2}$ S $_{2}$ in a wide temperature range. The isothermal magnetic entropy change $Δ S$ is calculated from the experimental magnetization curves by using Maxwell relation. In addition to the expected $Δ S$ peak at the Curie temperature $T_{C}$ , we obtain another one at the temperature $T_{in v}$ of the hysteresis inversion, which is the main experimental result. The inverted hysteresis usually originates from the antiferromagnetic coupling between two magnetic phases. For Co $_{3}$ Sn $_{2}$ S $_{2}$ topological magnetic Weyl semimetal these phases are the ferromagnetic bulk and the spin-polarized topological surface states. Thus, the pronounced magnetocaloric effect at $T_{in v}$ is determined by the bulk magnetization switching by the exchange bias field of the surface spin-polarizad phase, in contrast to the ferromagnetic-paramagnetic transition at the Curie temperature $T_{C}$ . For possible applications of magnetocaloric effect, Weyl semimetals open a new way to shift from ferromagnetic to the antiferromagnetic systems without loss of efficiency, but with higher reversibility and with smaller energy costs.

Magnetocaloric effect for the topological semimetal Co3​Sn2​S2​ due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases

Abstract

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Magnetocaloric effect for the topological semimetal Co $_{3}$ Sn $_{2}$ S $_{2}$ due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases