Structural and magnetic characterization of spin canted mixed ferrite-cobaltites: LnFe0.5Co0.5O3 (Ln = Eu and Dy)

Abstract

The mixed ferrite-cobaltites LnFe 0.5 Co 0.5 O 3 , with Ln = Eu & Dy have been prepared by a sol-gel method and the samples have been characterized using X-ray diffraction and electron microscopy. The magnetic investigations reveal that both samples ordered in canted antiferromagnetic structures near room temperature. The Dzyaloshinskii-Moriya or antisymmetric exchange interaction induces weak ferromagnetism due to canting of the antiferromagnetically ordered spins. In the case of Ln-Fe-Co orthoferrites, two magnetic sublattices (Ln 3+ -4f and Fe 3+ /Co 3+ -3d) generally align in opposite directions and interesting temperature dependent phenomena: e.g. uncompensated antiferromagnetic sublattices and spin-reorientations, are observed in the system. The existence of hysteresis at low temperature region has been explained in terms of the strength of magnetic interactions between Fe 3+ and Co 3+ ions with different A-site rare earth cations.

Magnetocaloric effect and spin-phonon correlations in RFe0.5Cr0.5O3 (R = Er and Yb) compounds

“…Interestingly, weak thermal hysteresis is also observed between FCC and FCW curves. As reported previously [13], [18,19]. This feature can be explained on the basis of interaction strength and effect of temperature on magnetic sub-lattices of both compounds.…”

Role of B-site cation on the structure, magnetic and dielectric properties of nanosized La0.7Sr0.3Fe1−xMxO3 (M = Mn; Co and x = 0, 0.5) perovskites

“…Moreover, the obtained magnetization versus high magnetic field, hysteresis loops measured below room temperature, but the saturated magnetization didn't obtain. Otherwise, conductivity and dielectric properties did not be studied [5,6]. Furthermore, P S J Bharadwaj et al prove that magnetization of YFeO 3 originated entirely from the canting of Fe 3+ moments, as Y 3+ being diamagnetic, cannot contribute to the magnetization.…”

Insulator–Metal Transition in the Nd2CoFeO6 Disordered Double Perovskite

“…The introduced chemical disorder, also known as antisite disorder (ASD), 7 can suppress or even lead to different magnetic and electronic phases into the system. 8,9 Interestingly, in the disordered Ln 2 CoFeO 6 family it has been observed multiple magnetic and electrical properties leading to high thermoelectric figure-of-merit, 10 spin reorientation transitions, 11−13 spin canting, 14 pyroelectric current, 13 magnetic entropy change, 15,16 and Griffith's-like phase. 17 From all of these results, it seems natural that spin-charge-lattice interactions play an essential role on the observed complex magnetic and electrical phase diagram.…”

“…The strong correlated unusual charge transport and magnetic properties bring about additional useful functionalities. − An additional degree of complexity in the structure property relationship is introduced when a random assembly of BO 6 and B′O 6 octahedra is considered in the crystal field. The introduced chemical disorder, also known as antisite disorder (ASD), can suppress or even lead to different magnetic and electronic phases into the system. , Interestingly, in the disordered Ln 2 CoFeO 6 family it has been observed multiple magnetic and electrical properties leading to high thermoelectric figure-of-merit, spin reorientation transitions, − spin canting, pyroelectric current, magnetic entropy change, , and Griffith’s-like phase . From all of these results, it seems natural that spin-charge-lattice interactions play an essential role on the observed complex magnetic and electrical phase diagram.…”