Observation of spontaneous spin reorientation in Nd1-x Dy (x) Fe-3(BO3)(4) ferroborates with a competitive R-Fe exchangeстатья

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[1] Observation of spontaneous spin reorientation in nd1-x dy (x) fe-3(bo3)(4) ferroborates with a competitive r-fe exchange / Y. F. Popov, A. M. Kadomtseva, G. P. Vorob'ev et al. // JETP Letters. — 2009. — Vol. 89, no. 7. — P. 345–351. The magnetic, magnetoelectric, and magnetoelastic properties of DyFe3(BO3)(4) single crystals and the Nd0.75Dy0.25Fe3(BO3)(4) substituted compound with the competitive Nd-Fe and Dy-Fe exchange interactions have been investigated in magnetic fields up to 210 kOe. It has been shown that the antiferromagnetic state in Nd0.75Dy0.25Fe3(BO3)(4) below the N,el temperature is easy-plane and a spontaneous spin-reorientation transition to a uniaxial state occurs near 25 K. Anomalies are observed in various physical characteristics in a spin-flop transition induced by the magnetic field along the trigonal axis. The H-T phase diagrams are constructed; they are in good agreement with a simple model taking into account the anisotropy of the exchange splitting and g factors of the ground doublets of the Dy3+ and Nd3+ ions. The features of the magnetoelectric effect in various magnetic phases have been studied. Spontaneous electric polarization has been revealed in the region of the existence of an easy-plane antiferromagnetic state in the substituted compound. A qualitative theoretical justification of the possibility of the appearance of the spontaneous spin-reorientation transition in the Nd0.75Dy0.25Fe3(BO3)(4) substituted compound is given. [ DOI ]

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