Superior room-temperature magnetic field-dependent magnetoelectric effect in BiFeO3-based multiferroic

Effect of Sm and Mn Co-doping on the Crystal Structure and Magnetic Properties of \(\text{BiFeO}_{3}\) Polycrystalline Ceramics

“…To overcome this obstacle, recent works have focused on chemical substitution in the Bi-site and Fe-site to collapse the space modulated spin structure [6][7][8]. The substitution of rare-earth elements for BiFeO 3 changes the ferroelectric properties and suppresses the cycloidal spin structure to reveal the weak ferromagnetic behavior [9,10]. Moreover, lanthanide doping also induces a structural transition from the initial antiferromagnetic/polar rhombohedral R3c phase to the weak ferromagnetic/antipolar orthorhombic PbZrO 3 -like phase and then to the weak ferromagnetic/nonpolar orthorhombic Pnma (or Pbnm) phase [11].…”

Oxygen‐vacancy‐controlled magnetic properties with magnetic pole inversion in BiFeO3‐based multiferroics

“…Even though this phenomenon is rare, recent studies have revealed the tunable and multiple magnetic pole inversions in multiferroics BiFeO 3 (denoted as BFO) . Due to its high ferroelectric Curie temperature (1103 K) and antiferromagnetic Néel temperature (643 K), BFO is one of the most promising single‐phase multiferroics and has attracted a lot of attention . Notably, the intrinsic defects of oxygen vacancies in BFO can significantly impact its properties, such as changing the fatigue behavior, remnant polarization and thermal conductivity, increasing the leakage current, and inducing dielectric relaxation and magnetodielectric, weak ferromagnetism, and electrochromism .…”

“…The BFO‐based solid solution of BiFeO 3 ‐DyFeO 3 (denoted as BDFO) is believed to be an ideal system for studying the correlation between oxygen vacancies and magnetism because it possesses complex types of competing magnetic interactions (which is typical of multiferroics): the weak antiferromagnetism of Fe 3+ origin, the spin glass/spin reorientation‐like behavior, and the paramagnetic properties of Dy 3+ origin . Our previous studies show that the partial substitution of the diamagnetic Bi 3+ ions (located on the A‐site of the perovskite structure) by the paramagnetic Dy 3+ ions (10.5 μ B ) can enhance the macroscopic magnetization, resulting in superior room‐temperature magnetoelectric effect . One of the unsolved yet intriguing issues is the oxygen concentration dependence of the magnetic interactions among the magnetic sub‐systems in BDFO, which has prevented us from better understanding the magneto‐chemistry and physics of multiferroics.…”

“…2,3 Due to its high ferroelectric Curie temperature (1103 K) and antiferromagnetic Néel temperature (643 K), BFO is one of the most promising single-phase multiferroics and has attracted a lot of attention. [4][5][6][7] Notably, the intrinsic defects of oxygen vacancies in BFO can significantly impact its properties, 8 such as changing the fatigue behavior, remnant polarization 9,10 and thermal conductivity, 11 increasing the leakage current, 12,13 and inducing dielectric relaxation and magnetodielectric, 14 weak ferromagnetism, 15,16 and electrochromism. 17 However, the correlation between oxygen vacancies and magnetism is still poorly understood, especially, the effects of oxygen vacancies on magnetic pole inversion have not been studied.…”

“…23 Our previous studies show that the partial substitution of the diamagnetic Bi 3+ ions (located on the A-site of the perovskite structure) by the paramagnetic Dy 3+ ions (10.5 μ B ) can enhance the macroscopic magnetization, 20 resulting in superior roomtemperature magnetoelectric effect. 4 One of the unsolved yet intriguing issues is the oxygen concentration dependence of the magnetic interactions among the magnetic sub-systems in BDFO, which has prevented us from better understanding the magneto-chemistry and physics of multiferroics. In our previous work, 3 the composition-driven magnetic pole inversion properties of (1−x)BiFeO 3 -xDyFeO 3 (x = 0-1) were systematically investigated.…”