Ho and Fe magnetic ordering in multiferroic HoFe3(BO3)O4
D. K. Shukla, S. Francoual, A. Skaugen, M. v. Zimmermann, H. C., Walker, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, J. Strempfer
TL;DR
This study investigates the magnetic ordering in HoFe3(BO3)O4, revealing a spiral spin order of Ho moments and a temperature-induced rotation of Fe spins that induce electric polarization, using advanced X-ray scattering techniques.
Contribution
It provides the first direct observation of spiral Ho magnetic order and its interaction with Fe spins in HoFe3(BO3)O4, elucidating the magnetic structure and polarization mechanisms.
Findings
Ho moments form a spiral spin order in the ab-plane.
Fe spins rotate at 22.5 K, inducing electric polarization.
Electric polarization components scale with magnetic scattering intensities.
Abstract
Resonant and non-resonant X-ray scattering studies on HoFe3(BO3)O4 reveal competing magnetic ordering of Ho and Fe moments. Temperature and X-ray polarization dependent measurements employed at the Ho L3 edge directly reveal a spiral spin order of the induced Ho moments in the ab-plane propagating along the c-axis, a screw-type magnetic structure. At about 22.5 K the Fe spins are observed to rotate within the basal plane inducing spontaneous electric polarization, P. Components of P in the basal plane and along the c-axis can be scaled with the separated magnetic X-ray scattering intensities of the Fe and Ho magnetic sublattices, respectively.
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