Magnetocrystalline anisotropy and dynamic spin reorientation of half-doped Nd_0.5Pr_0.5FeO₃ single crystal*

Abstract

The single crystals of Nd0.5Pr0.5FeO3 were successfully grown by optical floating zone method. Room temperature x-ray diffraction and Laue photograph declared the homogeneity and high quality of the crystal. The significant magnetic anisotropy and multiple magnetic transitions illustrate the complex magnetic structure. At high temperatures (T > 66 K), it shows the typical characteristics of Γ 4(G x , A y , F z ) state. With the decrease of the temperature, it undergoes a first-order spin reorientation transition from Γ 4(G x , A y , F z ) to Γ 2(F x , C y , G z ) state in the temperature window of 45–66 K under an applied magnetic field of 0.01 T. As the temperature drops to ∼ 17 K, a new magnetic interaction mechanism works, which results in a further enhancement of magnetization. The T–H phase diagram of Nd0.5Pr0.5FeO3 single crystal was finally constructed.

Pr-Doping Effect on Spin Switching in Nd0.8Pr0.2FeO3 Single Crystal

“…In RFeO 3 family, NdFeO 3 single crystal has the largest temperature range of SRT and the type-I SSW along a-axis, 12 while PrFeO 3 single crystal has a type-II SSW along c-axis, 14 so the mutual doping of these two materials may lead to more wonderful magnetic behaviors. However, in the previous report, Nd 0.5 Pr 0.5 FeO 3 single crystal only showed an SRT of Γ 4 -Γ 2 without any SSW, 46 which is quite unusual. Therefore, it is necessary to explore the effect of other ratios of Pr 3+ doping on the magnetic properties of NdFeO 3 .…”

Field-Tuning Mechanisms of Spin Switching and Spin Reorientation Transition in Praseodymium–Erbium Orthoferrite Single Crystals

“…Terahertz spectroscopy studies of Sm 0.5 Pr 0.5 FeO 3 confirm that the SR transition occurs at 175–210 K, which is lower than the T SR of SmFeO 3 . The SR transition type of DyFeO 3 is Γ 4 –Γ 1 , but on doping with Pr 3+ , Dy 0.5 Pr 0.5 FeO 3 shows a richer magnetic behavior that double SR transitions of Γ 4 –Γ 1 –Γ 2 . − In the 45–66 K temperature region of Nd 0.5 Pr 0.5 FeO 3 single crystals, Γ 4 –Γ 2 SR transition was observed . The SR transition temperature region of Ho 0.5 Pr 0.5 FeO 3 (75–90 K) was increased after Pr 3+ doping in HoFeO 3 (50–58 K), and a spin switching occurred, which has not been observed in HoFeO 3 . , The Sm x Pr 1– x FeO 3 system causes a variety of spin configurations, and magnetization jump (spin switching) changes due to Pr 3+ doping, which can be summarized ultimately as a result of strong interactions between the R 3+ 4f electrons and the Fe 3+ 3d electrons …”