Vortex order in magnetic frustrated GeNi$_2$O$_4$ and GeCo$_2$O$_4$ spinels
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2026
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| author | Beauvois, K. Robert, J. Songvilay, M. Ollivier, J. Fåk, B. Ressouche, E. Qureshi, N. Ballou, R. Petit, S. Lenne, S. Manuel, P. DeBrion, S. Strobel, P. Simonet, V. |
| author_facet | Beauvois, K. Robert, J. Songvilay, M. Ollivier, J. Fåk, B. Ressouche, E. Qureshi, N. Ballou, R. Petit, S. Lenne, S. Manuel, P. DeBrion, S. Strobel, P. Simonet, V. |
| contents | In the search for new spin textures based on singular magnetic objects like Bloch-points or vortices, spinel compounds emerge as an interesting playground due to the interplay between magnetic anisotropy and complex interactions that extend well beyond first neighbors on a pyrochlore lattice. Based on an exploration of the exchange interaction phase diagrams of members of the Ge$B_2$O$_4$ family with $B$=Co and Ni, we show, using simultaneous modeling of inelastic neutron scattering measurements and single-crystal neutron diffraction data, that a 2-$k$ magnetic structure may be stabilized in these compounds. This leads to a short period spin vortex crystal, a variant induced by the magnetic anisotropy of the 3-$k$ Bloch-point structure predicted for isotropic spins. Our study rationalizes the formation of these multi-$k$ spin textures in frustrated antiferromagnets, as well as their anisotropy-dependent evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_20029 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Vortex order in magnetic frustrated GeNi$_2$O$_4$ and GeCo$_2$O$_4$ spinels Beauvois, K. Robert, J. Songvilay, M. Ollivier, J. Fåk, B. Ressouche, E. Qureshi, N. Ballou, R. Petit, S. Lenne, S. Manuel, P. DeBrion, S. Strobel, P. Simonet, V. Strongly Correlated Electrons In the search for new spin textures based on singular magnetic objects like Bloch-points or vortices, spinel compounds emerge as an interesting playground due to the interplay between magnetic anisotropy and complex interactions that extend well beyond first neighbors on a pyrochlore lattice. Based on an exploration of the exchange interaction phase diagrams of members of the Ge$B_2$O$_4$ family with $B$=Co and Ni, we show, using simultaneous modeling of inelastic neutron scattering measurements and single-crystal neutron diffraction data, that a 2-$k$ magnetic structure may be stabilized in these compounds. This leads to a short period spin vortex crystal, a variant induced by the magnetic anisotropy of the 3-$k$ Bloch-point structure predicted for isotropic spins. Our study rationalizes the formation of these multi-$k$ spin textures in frustrated antiferromagnets, as well as their anisotropy-dependent evolution. |
| title | Vortex order in magnetic frustrated GeNi$_2$O$_4$ and GeCo$_2$O$_4$ spinels |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.20029 |