Influence of parasitic phases on the properties of BiFeO3 epitaxial thin films

Béa, Hélène; Bibès, Manuel; Barthélémy, A.; Bouzéhouane, K.; Jacquet, Éric; Khodan, A. N.; Contour, J. P.; Fusil, S.; Wyczisk, F.; Forget, A.; Lebeugle, D.; Colson, D.; Viret, M.

doi:10.1063/1.2009808

Cited by 379 publications

(210 citation statements)

References 16 publications

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“…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.…”

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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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Successive field-induced transitions in BiFeO3 around room temperature

Kawachi

Miyake

et al. 2017

Phys. Rev. Materials

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“…The thin films of BFO were grown by pulsed laser deposition on SrTiO 3 with a conductive buffer layer of La; Sr MnO 3 [16], and the ferroelectric domain morphology was studied by way of piezo-response atomic force microscopy (PFM). The shape of the spontaneous domains is highly irregular (Fig.…”

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Fractal Dimension and Size Scaling of Domains in Thin Films of MultiferroicBiFeO3

et al. 2008

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Domains in ferroelectric films are usually smooth, stripelike, very thin compared with magnetic ones, and satisfy the Landau-Lifshitz-Kittel scaling law (width proportional to square root of film thickness). However, the ferroelectric domains in very thin films of multiferroic BiFeO 3 have irregular domain walls characterized by a roughness exponent 0.5-0.6 and in-plane fractal Hausdorff dimension H jj 1:4 0:1, and the domain size scales with an exponent 0:59 0:08 rather than 1 2 . The domains are significantly larger than those of other ferroelectrics of the same thickness, and closer in size to those of magnetic materials, which is consistent with a strong magnetoelectric coupling at the walls. A general model is proposed for ferroelectrics, ferroelastics or ferromagnetic domains which relates the fractal dimension of the walls to domain size scaling.

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“…The loops are normalised to the saturation. Samples BFO4 and BFO6 display a very weak magnetic moment (reflected in the more noisy signal), that can be attributed to uncompensated moments of the BFO sublattices due to canted spins arising from the Dzyaloshinskii-Moriya interaction [3,4] or the the presence of a parasitic Fe 2 O 3 phase [11]. Conversely, sample BFO5 has a much stronger magnetic moment, that is the sum of a similar contribution coming from the BFO layer and of the magnetisation of the γ-Fe 2 O 3 platelets.…”

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Temperature dependence of magnetic and magnetotransport properties in BiFeO₃ thin films by pulsed laser deposition

et al. 2014

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Multiferroic BFO/SRO/Si trilayers have been prepared by pulsed laser deposition in the form of thin films. As a function of the BFO layer thickness, magnetic and magneto-transport properties have been investigated at room temperature and down to 5 K. At low BFO layer thickness, a residual γ-Fe 2 O 3 phase, which interacts interfacially with the SRO and BFO layers, is responsible for moderately hard magnetic properties of the film. On increasing BFO layer thickness, more homogeneous deposits are obtained with uniform magnetic and magnetoresistive properties.

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Influence of parasitic phases on the properties of BiFeO3 epitaxial thin films

Cited by 379 publications

References 16 publications

Successive field-induced transitions in BiFeO3 around room temperature

Successive field-induced transitions in BiFeO3 around room temperature

Fractal Dimension and Size Scaling of Domains in Thin Films of MultiferroicBiFeO3

Temperature dependence of magnetic and magnetotransport properties in BiFeO₃ thin films by pulsed laser deposition

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Influence of parasitic phases on the properties of BiFeO3 epitaxial thin films

Cited by 379 publications

References 16 publications

Successive field-induced transitions in BiFeO3 around room temperature

Successive field-induced transitions in BiFeO3 around room temperature

Fractal Dimension and Size Scaling of Domains in Thin Films of MultiferroicBiFeO3

Temperature dependence of magnetic and magnetotransport properties in BiFeO3 thin films by pulsed laser deposition

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Temperature dependence of magnetic and magnetotransport properties in BiFeO₃ thin films by pulsed laser deposition