Coupled magnetic and electric hysteresis in the multiferroic double   perovskite Lu2MnCoO6
  We investigate a magnetic hysteresis loop with a remanent moment that couples to electric polarization to create coupled hysteretic multiferroic behavior in Lu2MnCoO6. Measurements of elastic neutron diffraction, muon spin relaxation, and micro-Hall magnetometry demonstrate an unusual mechanism for the magnetic hysteresis, namely the hysteretic evolution of a microscopic magnetic order, and not classic ferromagnetic domain effects. We show how the frustrated spin system evolves from antiferromagnetism with an incommensurate long-wavelength modulation and strong fluctuations towards a net magnetism. We also clarify the different temperature scales for the onset of ordering, dynamics, and hysteresis. 
Vivien S. Zapf, B. G. Ueland, Mark Laver, Martin Lonsky, Merlin   Pohlit, Jens M\"uller, Tom Lancaster, Johannes S. M\"oller...
cond-mat.mtrl-sci