Spin-reorientation magnetic transitions in Mn-doped SmFeO₃

Abstract

Spin reorientation is a magnetic phase transition in which rotation of the magnetization vector with respect to the crystallographic axes occurs upon a change in the temperature or magnetic field. For example, SmFeO 3 shows a magnetization rotation from the c axis above 480 K to the a axis below 450 K, known as the À 4 ! À 2 transition. This work reports the successful synthesis of the new single-crystal perovskite SmFe 0.75 Mn 0.25 O 3 and finds interesting spin reorientations above and below room temperature. In addition to the spin reorientation of the À 4 ! À 2 magnetic phase transition observed at around T SR2 = 382 K, a new spin reorientation, À 2 ! À 1 , was seen at around T SR1 = 212 K due to Mn doping, which could not be observed in the parent rare earth perovskite compound. This unexpected spin configuration has complete antiferromagnetic order without any canting-induced weak ferromagnetic moment, resulting in zero magnetization in the low-temperature regime. M-T and M-H measurements have been made to study the temperature and magnetic-field dependence of the observed spin reorientation transitions.

Nature of the ferromagnetic-antiferromagnetic transition in Y$_{1-x}$La$_{x}$TiO$_{3}$

“…We also note that such strongly reduced anisotropy between the a-and c-axes is known to occur upon charge-carrier doping of YTiO 3 by substituting Ca at the Y site 20 . In the literature, rotation of crystallographic easy axes in single crystals has been reported mostly as a function of temperature and magnetic field 44,45 and attributed to intricate structural details as well as coupling between different magnetic sublattices. It is a distinct possibility that different methods of crystal growth cause subtle differences in single-ion anisotropy, which would in turn control the magnetocrystalline anisotropy.…”

Mixing A -type and G -type B -site antiferromagnetism in AMn1Pajerowski1 2018Phys. Rev. B5020View full textAdd to dashboardCite

“…Similar to NMFO, PMFO shows a region of two magnetic transitions from x ≈ 0.35 to 0.5 that map well to the phase diagram in Figure 6. The SmMn1-xFexO3 is less studied, with a report of SmMn0.25Fe0.75O3 [64] that is concerned mainly with the FeO6 octahedral rotation induced spinreorientations that are not considered here. Some insight may also be gained for specific regions of heavier rare-earths.…”

Thermal control magnetic switching dominated by spin reorientation transition in Mn-doped PrFeO3 single crystals

“…In addition, the magnetization of PrFe 1−x Mn x O 3 single crystals above the transition temperature decreases with the increase of Mn doping. One possible reason is that the canted antiferromagnetic structure of Fe is destroyed by the doping of Mn, which weakens the macroscopic magnetization of the system [27][28][29][30]. In order to identify the phase transition type of the observed spin reorientation, temperature dependent magnetization measurements were carried out along the a and b axes in addition to the c axis.…”