Magnetic control of transverse electric polarization in BiFeO3

Tokunaga, Masashi; Akaki, Mitsuru; Ito, T.; Miyahara, Shin; Miyake, Atsushi; Kuwahara, H.; Furukawa, Nobuo

doi:10.1038/ncomms6878

Cited by 109 publications

(93 citation statements)

References 32 publications

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“…A similar dependence of P s on the direction of the magnetic field was observed in BiFeO 3 [37,38]. The numerical calculations show that in both orientations that with increasing of the external magnetic field h the width of the temperature interval ΔТ SR = T 1 -T 2 decreases (Fig.…”

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confidence: 60%

Microscopic Approach to the Magnetoelectric Coupling in RCrO3 (R = Y, La, Lu and Eu) Compounds

Apostolov¹,

Apostolova²

2017

International Advanced Research Journal in Science, Engineering

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Abstract:A microscopic theory of magnetoelectric (ME) effects in multiferroic RCrO 3 compounds, where R is a nonmagnetic ion (R = Y, La, Lu and Eu) is presented. Taking into account the influence of polar lattice displacements on symmetric and antisymmetric exchange interactions, two types of coupling between the magnetic and the ferroelectric subsystems are defined. The first magnetoelectric interaction is biquadratic with respect to the spin and pseudo-spin operators. The second, called antisymmetric, is induced by the appearance of spontaneous polarization in RCrO 3 . The built-in microscopic model describes the occurrence of a temperature-dependent spin-reorientation (SR) transition and defines it as continuous (continuous rotation of the magnetic spins in the zx -plane within a given temperature interval). The emergence of additional polarization as a consequence of a magnetic phase transition has been proven theoretically. This is due to the induction of an antisymmetric magnetic interaction of type Dzyaloshinsky-Moriya (DM) interaction, which is a consequence of the occurrence of spontaneous polarization in these compounds. The influence of magnetoelectric interactions on the magnetic and ferroelectric subsystems has been investigated. The behaviour of magnetization at the application of an external electric field is qualitatively explained with the renormalization of the exchange symmetric and antisymmetric magnetic interactions by the spontaneous polarization P S . The dependence of spontaneous polarization on the direction of external magnetic field was explained by the occurrence of feedback between P S and magnetization. It has been established that the width of the temperature interval ΔТ SR , in which the SR transition takes place, decreases with the increase of the value of the external magnetic field. The method of Green's function is used for the numerical calculations.

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Section: Ugc Approved Journalsupporting

confidence: 60%

Microscopic Approach to the Magnetoelectric Coupling in RCrO3 (R = Y, La, Lu and Eu) Compounds

Apostolov¹,

Apostolova²

2017

International Advanced Research Journal in Science, Engineering

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“…This state is known to exhibit marginal quadratic magnetoelectric (ME) effect at low magnetic fields [12]. High magnetic fields of ∼20 T stabilize the canted antiferromagnetic (CAFM) phase as opposed to the cycloidal phase [13][14][15][16][17]. Although several groups succeeded in realizing the CAFM phase at zero field [18][19][20][21][22][23], the ME effect in this phase has not been clarified.…”

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confidence: 99%

“…The kink at ∼ 15 T indicated the existence of a magnetic transition at this field [17]. Extrapolation of the linear M -H curve at high field to zero field indicated finite offsets in the vertical axis and thus suggested that the high field phase possesses spontaneous magnetization (M S ).…”

mentioning

confidence: 99%

“…Recently, Tokunaga et al indicated the emergence of an electric polarization perpendicular to the Z direction that was controlled by magnetic fields [17]. Theoretical calculations suggested that the cycloidal spin order in BiFeO 3 could involve electric polarization perpendicular to the Q i -Z plane as illustrated as P T in Fig.…”

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confidence: 99%

“…However, this change was suppressed in the second field cycle (blue). This irreversible change (also known as the nonvolatile effect) was ascribed to the reorientation of the magnetoelectric domains [9,17]. It was assumed that the transverse electric polarization P T changed the direction during the reorientation of the cycloidal domains to the Q 2 domain in the initial field scan.…”

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confidence: 99%

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Successive field-induced transitions in BiFeO3 around room temperature

Kawachi

Miyake

et al. 2017

Phys. Rev. Materials

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The effects of high magnetic fields applied perpendicular to the spontaneous ferroelectric polarization on single crystals of BiFeO3 were investigated through magnetization, magnetostriction, and neutron diffraction measurements. The magnetostriction measurements revealed lattice distortion of 2 × 10 −5 , during the reorientation process of the cycloidal spin order by applied magnetic fields. Furthermore, anomalous changes in magnetostriction and electric polarization at a larger field demonstrate an intermediate phase between cycloidal and canted antiferromagnetic states, where a large magnetoelectric effect was observed. Neutron diffraction measurements clarified that incommensurate spin modulation along [110] Recently, multiferroic materials have been widely investigated due to their coupling between magnetic and ferroelectric ordering. BiFeO 3 is perhaps the most extensively studied multiferroic material as it possesses robust multiferroicity at room temperature as well as various possible applications [1][2][3][4][5][6][7][8][9][10]. The effects of magnetic fields on the coupled multiple degrees of freedom behind these phenomena are not fully understood.BiFeO 3 exhibits a cycloidal magnetic order below 640 K [11]. This state is known to exhibit marginal quadratic magnetoelectric (ME) effect at low magnetic fields [12]. High magnetic fields of ∼20 T stabilize the canted antiferromagnetic (CAFM) phase as opposed to the cycloidal phase [13][14][15][16][17]. Although several groups succeeded in realizing the CAFM phase at zero field [18][19][20][21][22][23], the ME effect in this phase has not been clarified. In this study, several features were observed when a magnetic field was applied normal to the trigonal c-axis, and they indicated that a third magnetic phase emerged in bulk BiFeO 3 between the cycloidal and CAFM phases at approximately room temperature.BiFeO 3 has a crystal structure with the polar space group of R3c. A large switchable spontaneous electric polarization emerges along the c-axis of the trigonal cell [24][25][26]. Degeneracy exists in selecting the polarization direction from eight 111 directions in the cubic unit. Hence, depending on synthesis methods, BiFeO 3 crystals can contain multiple ferroelectric domains [27].Magnetic domains can be present even in single ferroelectric domain crystals. The magnetic propagation vector Q points in one of the 110 directions of the trigonal cell [11] in the cycloidal spin ordered state below ∼640 K. The three-fold rotational symmetry around the c-axis (Z direction in this paper) leads to three equivalent Q i (i = 1, 2, 3), as shown in Fig. 1(d). The spins rotated primarily in the Q i -Z plane in a magnetic domain with a given Q i .Recently, Tokunaga et al. indicated the emergence of an electric polarization perpendicular to the Z direction that was controlled by magnetic fields [17]. Theoretical calculations suggested that the cycloidal spin order in BiFeO 3 could involve electric polarization perpendicular to the Q i -Z plane as illustrated as P T in...

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