Electric Field–Induced Magnetization Rotation in Magnetoelectric Multiferroic Fluids

Abstract

Multiferroics are of interest for applications as the magnetoelectric coupling effect between ferroelectric and magnetic order parameters. Here, an approach to control and switch the ferromagnetic orientation with an electric field using the multiferroic fluids is reported. A new multiferroic material, the so‐called magnetoelectric multiferroic fluids, has been prepared by distributing surface treated Ni0.5Zn0.5Fe2O4@CoFe2O4 core–shell structured particles in to a highly insulating silicone oil. An electromagnetic coupling phenomenon is used that is manifested in core–shell structure consisting of a ferromagnetic Ni0.5Zn0.5Fe2O4 wrapped tightly with the ferroelectric BaTiO3 in the fluid, which is based on magnetoelectric coupling at the interface between a ferromagnet and the ferroelectric. Three general manifestations of the coupling interactions are discovered, the first is that the hysteresis loops tend to shift from the origin along the voltage axis toward the positive or positive direction, an exchange bias like behavior, a consequence of pinned effect; the second is an enhancement of the coercive field of the ferromagnet as a consequence of enhanced rotate drag effect; and the third one is the improved residual magnetization. The results imply that conventional core–shell structured multiferroic fluids may have an opportunity to gain electrical control of the magnetization.

A comparative study on the dielectric and multiferroic properties of Co0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics

“…They are promising candidates for potential use in many new-type and multi-functional devices, such as spintronic devices, transducer, storage, capacitor etc. [4][5][6]. In recent years, in order to develop materials with new multi-functionality, multiferroics exerts a tremendous fascination of researchers.…”

Effect of sintering temperature on magnetoelectric coupling in 0.2Ni0.9Zn0.1Fe2O4-0.8Ba0.9Sr0.1TiO3 composite ceramics

“…ME coupling is appealing not only for its potential application in information storage, spintronic devices, transducer, capaci-tor and frequency devices, but also exciting for fundamental physics concepts like magnetic and electric coupling [7][8][9]. Multiferroic materials include single phase and composite materials, however, single-phase multiferroics are rare in nature and show very feeble ME coupling, which is observed only at low temperatures (below room temperature), limiting their practical applications [10][11][12]. Fortunately, there is a workaround to this problem: multiferroic composite, which is composed of magnetic and ferroelectric materials, can produce stronger room temperature ME effect than that of single phase material.…”

A comparative study on the structural, dielectric, ferroelectric and magnetic properties of CoFe2O4/PbZr0.52Ti0.48O3 multiferroic composite with different molar ratios

“…Multiferroic material is a novel multi-functional material which couples electrical, magnetic and structural ordering parameters, and thus produces ferroelectric, ferromagnetic and ferroelastic effects [1][2][3][4][5]. Especially, the magnetoelectric (ME) effect has become a hot topic in recent years due to its intriguing physical properties and practical applications in various of device such as super capacitor, spintronic devices, information storage, sensors, transistors and so on [6][7][8][9][10].…”