Self-assembled multiferroic nanostructures in the CoFe2O4-PbTiO3 system

Li, Jianhua; Levin, Igor; Slutsker, Julia; Provenzano, V.; Schenck, Peter K.; Ramesh, R.; Ouyang, Jun; Roytburd, Alexander L.

doi:10.1063/1.2031939

Cited by 118 publications

(72 citation statements)

References 10 publications

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“…13 Therefore, an intrinsic piezoelectric response of the ͕001͖ film is expected to be considerably weaker than 50 pm/V previously measured on the ͕001͖ 1 / 3CoFe 2 O 4 −2/ 3PbTiO 3 nanostructures using electrodes. 12 This relatively strong response ͑compared to the value of 79 pm/V for a freestanding PbTiO 3 film͒ ͑Ref. 14͒ can be explained only assuming a substantial extrinsic piezoelectric effect associated with the 90°-domain wall movement.…”

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confidence: 99%

Piezoelectric response of nanoscale PbTiO3 in composite PbTiO3−CoFe2O4 epitaxial films

Tan

Roytburd

Levin

et al. 2008

Applied Physics Letters

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Piezoelectric properties of PbTiO3 in 1/3PbTiO3−2/3CoFe2O4 transverse epitaxial nanostructures on differently oriented SrTiO3 were analyzed using conventional and switching-spectroscopy piezoelectric force microscopy. The results confirmed that the individual PbTiO3 nanocolumns in the CoFe2O4 matrix exhibit a detectable piezoelectric response regardless of substrate orientation. For the {100} and {110} orientations, a bias of ±10 V produced ferroelectric domain switching; however, no switching was observed for the {111} films. Small values of piezoelectric constants dzz(100)≈11 pm/V, dzz(110)≈5 pm/V, and dzz(111)≈3 pm/V are attributed to the weak intrinsic response of the nano-PbTiO3 under strong mechanical and depolarizing-field constraints in the composite films.

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Piezoelectric response of nanoscale PbTiO3 in composite PbTiO3−CoFe2O4 epitaxial films

Tan

Roytburd

Levin

et al. 2008

Applied Physics Letters

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“…8 Zheng et al 9 deposited epitaxial two phase films that self-assembled into nanopillars of CoFe 2 O 4 ͑CFO͒ in a BaTiO 3 ͑BTO͒ matrix. For two-phase multiferroic thin films, not only have such ͑1-3͒ and ͑3-1͒ structures ͑i.e., nanopillars in a second phase matrix͒ been reported, [9][10][11][12][13][14][15][16][17] but many other types of structures with different phase interconnectives have also, such as ͑0-3͒ nanoparticles dispersed in a matrix [18][19][20][21][22] and ͑2-2͒ mutilayer two-phase composite thin films. 23,24 Theoretically, the ͑1-3͒ structure should be the best type for ME coupling in epitaxial films.…”

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Direct measurement of magnetoelectric exchange in self-assembled epitaxial BiFeO3–CoFe2O4 nanocomposite thin films

Li¹,

Xing²,

Wang³

et al. 2009

Applied Physics Letters

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“…We also note that a sharp weight loss of CoFe 2 O 4 occurs at approximately 721 K in the TG curve at heating processes, however, a sharp weight gain occurs at approximately 670 K at cooling processes. These features imply that the ferrimagnetic CoFe 2 O 4 phase may be identified by the sharp weight loss/ weight gain using the TMG technique in Aurivillius-type multiferroic material, if it is assumed that it does not interact with the Aurivillius phase matrix, in view of considerable evidences of phase separation between CoFe 2 O 4 spinel phase and perovskite structures such as BiFeO 3 [26], BaTiO 3 [27] and PbTiO 3 [28]. Fig.…”

Section: Science China Materialsmentioning

confidence: 99%

Measuring room-temperature intrinsic multiferroic properties by excluding the secondary magnetic inclusion contribution

et al. 2015

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main phase or from the secondary phase formed during the sample preparation is still under debate [12,13]. Therefore, some new methods or sensible techniques have to be developed to identify intrinsic multiferroic responses in studying suc h complicated layered oxides.Normally, the X-ray diffraction (XRD) method provides a direct way to detect a secondary phase i n powders, thin films or bulk ceramics, but this method cannot deal with the case that the weight ratio of the impurity is below a certain critical level (~5 wt.%, for example). Scanning electron microscopy (SEM) and/or electron backscatter (EBS) coupled with an energy dispersive X-ray spectroscopy (EDX/ EDS) [14] can also offer useful information to detect the possible existence of secondary phase, but they are limited to very small sample volumes [12]. Interestingly, the derivative thermo-magneto-gravimetry (DTMG ) technique [15], using the principle that magnetic transition affects weight, is very promising for tracing various subtle changes of the magnetic property vs. temperature, especially the magnetic contributions.In this study, we applied the DTMG technique to quantitatively discern the content and the magnetic contribution of the possible ferromagnetic/ferrimagnetic inclusions in a Bi 7 Fe 2.25 Co 0.75 Ti 3 O 21 (BFCT) layered oxide ceramic, which is chosen because of its relatively stronger FE and FM properties observed at RT [16]. The impurity identified in BFCT ceramic is CoFe 2 O 4 with a weight ratio of ~3.6% and its magnetic contribution to weight loss is ~15%. Significantly, it was testified that this layered oxide has good magnetic response at RT, which is intrinsic. Our experimental results also suggested that the measurement accuracy of DTMG method can reach to ~0.5 wt.%, far below the detection limit of XRD. In short, this DTMG method isThe assertion that a new material could become a potential single-phase and room-temperature functioning multiferroic material may be confounded by the presence of minor amount of secondary magnetic inclusions, especially in the Aurivilliustype material system. In this study, we demonstrated that the derivative thermo-magneto-gravimetry (DTMG) technique can be a sensitive tool to identify an d quantify the magnetic secondary phases in the Bi7Fe2.25Co0.75Ti3O21 ceramic, which shows the potential to become a single-phase multiferroic material. The accuracy of this DTMG measurement experimentally reaches to ~0.5 wt.%, far below the detection limit of the traditional X-ray diffraction. The impurity identified in the specimen is the ferrimagnetic CoFe2O4 spinel phase with an amount of ~3.6 wt.%. Significantly, the room-temperature intrinsic magnetism of the ceramic was measured, which is sorely from the main phase.

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Self-assembled multiferroic nanostructures in the CoFe2O4-PbTiO3 system

Cited by 118 publications

References 10 publications

Piezoelectric response of nanoscale PbTiO3 in composite PbTiO3−CoFe2O4 epitaxial films

Piezoelectric response of nanoscale PbTiO3 in composite PbTiO3−CoFe2O4 epitaxial films

Direct measurement of magnetoelectric exchange in self-assembled epitaxial BiFeO3–CoFe2O4 nanocomposite thin films

Measuring room-temperature intrinsic multiferroic properties by excluding the secondary magnetic inclusion contribution

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