Spin-flop transition driven by competing magnetoelastic anisotropy terms in a spin-spiral antiferromagnetReport as inadecuate




Spin-flop transition driven by competing magnetoelastic anisotropy terms in a spin-spiral antiferromagnet - Download this document for free, or read online. Document in PDF available to download.

1 Department of Materials Science and Metallurgy

Abstract : Holmium, the archetypical system for spin-spiral antiferromagnetism, undergoes an in-plane spin-flop transition earlier attributed to competing symmetry-breaking and fully symmetric magnetoelas-tic MEL anisotropy terms Phys. Rev. Lett. 94, 227204 2005, which underlines the emergence of six-fold MEL constants in heavy rare earth RE metals, as otherwise later studies suggested Phys. Rev. Lett. 98, 267201 2007 and Phys. Rev. B 89, 134421 2014. A model that encompasses MEL contributions to the in-plane sixfold magnetic anisotropy is laid out to elucidate the mechanism behind the spin-flop transition. The model, which is tested in a Ho-based superlat-tice, shows that the interplay between competing fully symmetric α-MEL and symmetry-breaking γ-MEL anisotropy terms triggers the spin-reorientation. This also unveils the dominant role played by the six-fold exchange magnetostriction constant, where D 66 α2 0.32 GPa against its crystal-field counterpart M 66 α2 −0.2 GPa, in contrast to the crystal-field origin of the symmetry-breaking mag-netostriction in RE metals.

Keywords : rare earth metals holmium magnetoelastic effects magnetostriction spin-flop transition magnetoelastic anisotropy





Author: L Benito -

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents