Multi- k spin ordering in CaFe3Ti4O12 stabilized by spin-orbit coupling and further-neighbor exchange

Midori Amano Patino*, Fabio Denis Romero, Masato Goto, Takashi Saito, Fabio Orlandi, Pascal Manuel, Attila Szabó, Paula Kayser, Ka H. Hong, Khalid N. Alharbi, J. Paul Attfield, Yuichi Shimakawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Orthogonal spin ordering is rarely observed in magnetic oxides because nearest-neighbor symmetric Heisenberg superexchange interactions usually dominate. We have discovered that in the quadruple perovskite CaFe3Ti4O12, where only the S=2 Fe2+ ion is magnetic, long-range magnetic order consisting of an unusual arrangement of three interpenetrating orthogonal sublattices is stabilized. Each magnetic sublattice corresponds to a set of FeO4 square planes sharing a common orientation. This multi-k magnetic spin ordering is the result of fourth-neighbor spin couplings with a strong easy-axis anisotropy. In an applied magnetic field, each sublattice tends towards ferromagnetic alignment, but remains polarized by internal magnetic fields generated by the others, thus stabilizing in a noncollinear canted ferromagnetic structure. CaFe3Ti4O12 provides a rare example of how nontrivial long-range spin order can arise when near-neighbor Heisenberg superexchange is quenched.

Original languageEnglish
Article number043208
JournalPhysical Review Research
Issue number4
Early online date22 Dec 2021
Publication statusE-pub ahead of print - 22 Dec 2021


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