Anisotropic and nonlinear magnetodielectric effects in orthoferrite ErFeO3 single crystals

Abstract

In rare-earth orthoferrites, strongly correlated order parameters have been thoroughly investigated, which aims to find multiple functionalities such as multiferroic or magnetoelectric properties. We have discovered highly anisotropic and nonlinear magnetodielectric effects from detailed measurements of magnetoelectric properties in single-crystalline orthoferrite, ErFeO 3 . Isothermal dielectric constant varies in shapes and signs depending on the relative orientations between the external electric and magnetic fields, which may be ascribed to the spin-phonon couplings. In addition, a dielectric constant with both electric and magnetic fields along the c axis exhibits two symmetric sharp anomalies, which are closely relevant to the spin-flop transition, below the ordering temperature of Er 3+ spins, T Er = 3.4 K. We speculate that the magnetostriction from the exchange couplings between Er 3+ and Fe 3+ magnetic moments would be responsible for this relationship between electric and magnetic properties. Our results present significant characteristics of the orthoferrite compounds and offer a crucial guide for exploring suitable materials for magnetoelectric functional applications.

Coherent charge hopping suppresses photoexcited small polarons in ErFeO 3 by antiadiabatic formation mechanism

“…ErFeO 3 is an antiferromagnetic, charge-transfer insulator that crystallizes in an orthorhombically distorted perovskite structure with the space group Pbnm , as confirmed by x-ray diffraction (note S1, fig. S1, and table S1) ( 32 ) and depicted in Fig. 1A .…”

Temperature dependence of magnetic moment of rare earth ions in ErFeO3 and NdFeO3 single crystals

“…For example, the SRT temperature range for our crystals is between 88 and 100 K for ErFeO 3 and between 101 and 171 K for NdFeO 3 , as commonly reported. 30,38 Spontaneous magnetic moment measured at 300 K along the crystalline c-axis is a measure of the Fe content in these crystals, as R 3+ ions give an insignificant contribution to the magnetic moment at these temperatures. Our NdFeO 3 crystal gave 0.036m B f.u.…”

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

“…The magnetization vs temperature curves of ErFeO 3 show a “butterfly” shape, which is characterized by the parallel and/or antiparallel magnetic moment configurations between Er 3+ and Fe 3+ magnetic sublattices at a specific temperature during the magnetic measurements in the warming and cooling process, resulting in the type-I spin switching effect . ErFeO 3 has also been studied in the fields of exchange bias effects, terahertz optomagnetic interaction, nonlinear magnetodielectric effects, and mean-field theory calculations. ,− Huang et al investigated the anisotropic magnetic entropy change of ErFeO 3 , which exhibits a large magnetic entropy change in all three crystal axes with a cooling capacity value of RC = 273.5 J/kg . Unconventional exchange biases have been also found in members of RFeO 3 systems such as ErFeO 3 . , This exchange bias occurs near the magnetization compensation temperature, and on both sides of the compensation temperature, a negative and a positive exchange bias occur, respectively.…”