Spontaneous Rotation of Ferrimagnetism Driven by Antiferromagnetic Spin Canting

A. M. Vibhakar, D. D. Khalyavin, P. Manuel, J. Liu, A. A. Belik, R. D. Johnson
2020 Physical Review Letters  
Spin-reorientation phase transitions that involve the rotation of a crystal's magnetization have been well characterized in distorted-perovskite oxides such as orthoferrites. In these systems spin reorientation occurs due to competing rare-earth and transition metal anisotropies coupled via f-d exchange. Here, we demonstrate an alternative paradigm for spin reorientation in distorted perovskites. We show that the R_{2}CuMnMn_{4}O_{12} (R=Y or Dy) triple A-site columnar-ordered quadruple
more » ... tes have three ordered magnetic phases and up to two spin-reorientation phase transitions. Unlike the spin-reorientation phenomena in other distorted perovskites, these transitions are independent of rare-earth magnetism, but are instead driven by an instability towards antiferromagnetic spin canting likely originating in frustrated Heisenberg exchange interactions, and the competition between Dzyaloshinskii-Moriya and single-ion anisotropies.
doi:10.1103/physrevlett.124.127201 pmid:32281828 fatcat:mt5wbn6ofvbwbk4ct5t3mtypna