Spin-lattice relaxation dynamics in Multiferroic CuFe2O4

Recently, NiFe2O4 shows a ferroelectric order around ~ 98 K. Although a possible ordered occupancy of Ni2+ and Fe3+ atoms at the octahedral sites of P4122 structure was correlated to the ferroelectricity, the possible modulation of the magnetic structure still remain unexplored. Analogous to NiFe2O4, CuFe2O4 shows ferroelectric order at ~ 39 K. Our interest is to understand possible origin of ferroelectric order by investigating mu_SR studies in CuFe2O4. We, therefore, propose to investigate the temperature dependence of muon-spin rotation (μSR) on CuFe2O4 both in zero magnetic field and in presence of magnetic field. This sensitive information of the static and dynamic properties of the ordered spins near ferroelectric ordering along with the information on the values of magnetic moment can be obtained using the magnetic structure (a diffraction proposal has been submitted on WISH).

最近，NiFe₂O₄在约98 K时呈现铁电有序。尽管P4₁22结构八面体位点上Ni²+和Fe³+原子的有序占据可能与铁电性相关，但磁结构的可能调制仍未被探索。与NiFe₂O₄类似，CuFe₂O₄在约39 K时呈现铁电有序。我们的研究兴趣在于通过对CuFe₂O₄进行μ子自旋弛豫（μSR）研究，探究其铁电有序的潜在起源。因此，我们建议在零磁场和有磁场条件下，研究CuFe₂O₄的μ子自旋旋转（μSR）随温度的变化关系。通过磁结构分析（已向WISH提交衍射提案），可获取铁电有序温度附近有序自旋的静态与动态特性，以及磁矩数值的相关敏感信息。