Magnetoelectric Coupling in Ordered Arrays of Multilayered Heteroepitaxial BaTiO3/CoFe2O4 Nanodots

Lü, Xiaoli; Kim, Yunseok; Goetze, Silvana; Li, Xiaoguang; Dong, Sining; Werner, P.; Alexe, Marin; Hesse, D.

doi:10.1021/nl201443h

Cited by 101 publications

(88 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the constraint of completely regular arrays of CFO nanopillars 12 , one might even envisage data-storage concepts by encoding the local polarization patterns of single nanopillars (Fig. 4c) via external current-controlled local magnetic fields H x or H y .…”

Section: Discussionmentioning

confidence: 99%

Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields

et al. 2013

View full text Add to dashboard Cite

Ferrimagnetic CoFe 2 O 4 nanopillars embedded in a ferroelectric BaTiO 3 matrix are an example for a two-phase magnetoelectrically coupled system. They operate at room temperature and are free of any resource-critical rare-earth element, which makes them interesting for potential applications. Prior studies succeeded in showing strain-mediated coupling between the two subsystems. In particular, the electric properties can be tuned by magnetic fields and the magnetic properties by electric fields. Here we take the analysis of the coupling to a new level utilizing soft X-ray absorption spectroscopy and its associated linear dichroism. We demonstrate that an in-plane magnetic field breaks the tetragonal symmetry of the (1,3)-type CoFe 2 O 4 /BaTiO 3 structures and discuss it in terms of off-diagonal magnetostrictive-piezoelectric coupling. This coupling creates staggered in-plane components of the electric polarization, which are stable even at magnetic remanence due to hysteretic behaviour of structural changes in the BaTiO 3 matrix. The competing mechanisms of clamping and relaxation effects are discussed in detail.

show abstract

Section: Discussionmentioning

confidence: 99%

Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields

et al. 2013

View full text Add to dashboard Cite

show abstract

“…12,13 In one approach, a BaTiO3-CoFe2O4 (BTO-CFO) multilayer is deposited onto the AAO film on an STO substrate, which yields a small amount of magnetoelectric response. 12 Another technique is to use the AAO film to form CFO islands and then overcoat the islands with ferroelectric Pb(Zr,Ti)O3 (PZT), which yields a composite that is both ferroelectric and ferromagnetic. 13 Others have used a SiN membrane as a shadow mask to 3 grow ferromagnetic La0.7Sr0.3MnO3 islands and overcoat them with ferroelectric PbTiO3, which produces an epitaxial composite structure with sub-micron dots and intriguing ferroelectric domain structures.…”

mentioning

confidence: 99%

Directed Self-Assembly of Epitaxial CoFe₂O₄–BiFeO₃ Multiferroic Nanocomposites

Comès¹,

Liu²,

et al. 2012

View full text Add to dashboard Cite

ABSTRACT. CoFe2O4 (CFO)-BiFeO3 (BFO) nanocomposites are an intriguing option for future memory and logic technologies due to the magnetoelctric properties of the system. However, these nanocomposites form with CFO pillars randomly located within a BFO matrix, making implementation in devices difficult. To overcome this, we present a technique to produce patterned nanocomposites through self-assembly. CFO islands are patterned on Nb-doped SrTiO3 to direct the self-assembly of epitaxial CFO-BFO nanocomposites, producing square arrays of CFO pillars.2 Multiferroic nanocomposite films have been heavily studied for their potential applications in magnetoelectric systems. 1 The CoFe2O4-BiFeO3 (CFO and BFO, respectively) system has generated particular interest due to the magnetoelastic properties of CFO 2 and the combination of ferroelectricity and anti-ferromagnetism in BFO 3 . It has been shown that when CFO and BFO are codeposited via physical vapor deposition at high temperatures on a SrTiO3 (001) substrate that the materials will spontaneously phase segregate to produce an epitaxial CFO pillar in an epitaxial BFO matrix, which is referred to as a 1-3 nanocomposite. 4 The CFO pillars form faceted structures with {110}-type interfaces with the BFO matrix and {111}-facets on the surface, protruding above the matrix. 5 The pattern of the CFO pillars in the structure is essentially random, since they are formed through the nucleation of a CFO island on the substrate, while BFO wets the remaining surface. Thus, to control the location of the pillars a means of controlling the nucleation site for the CFO island is needed. CFO-BFO composites have been found to demonstrate magnetoelectric coupling, allowing for electrical control of the magnetic anisotropy of the CFO pillars. 6 , 7 Based on these properties, the composite system has been proposed for both magnetoelectric memory 8 and logic 9 applications. In particular, the reconfigurable array of magnetic automata (RAMA) 9,10 is a nanomagnetic logic system based on the magnetic quantum cellular automata (MQCA) logic architecture 11 which would use a CFO-BFO 1-3 composite with the pillars arranged in a square array to create a reprogrammable logic system. However, in order to make devices using these composites, the ability to place the pillars into pre-determined arrays is required.Previous work in patterning multiferroic nanocomposites has been limited. One method to produce patterned magnetoelectric composites is to use a porous anodic aluminum oxide (AAO) film as a liftoff mask during deposition, which produces a hexagonal array pattern. 12,13 In one approach, a BaTiO3-CoFe2O4 (BTO-CFO) multilayer is deposited onto the AAO film on an STO substrate, which yields a small amount of magnetoelectric response. 12 Another technique is to use the AAO film to form CFO islands and then overcoat the islands with ferroelectric Pb(Zr,Ti)O3 (PZT), which yields a composite that is both ferroelectric and ferromagnetic. 13 Others have used a SiN membrane as a shadow mask to 3 ...

show abstract

“…[6][7][8][9] The magnetoelectric effect in two-phase systems may be mediated by strain, and this often forms the basis of the search for multiferroic materials. [8][9][10] Recently, nanopatterned heterostructures, 11 composites, 12,13 or epitaxial multilayers 14,15 have also been investigated. A particular case of strain-driven magnetoelectric effect occurs in heterostructures combining ferroelectric substrates such as BaTiO 3 19,20 In these systems, changes in the FM layer are mediated by the piezoelectric effect of the substrate via magnetoelastic (ME) coupling.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic coupling in La0.7Ca0.3MnO3/BaTiO
Alberca
¹
,
Nemes
²
,
Mompeán
³

et al. 2013
Phys. Rev. B
7
0
4
0
View full text Add to dashboard Cite

The magnetism of La 0.7 Ca 0.3 MnO 3 (LCMO) epitaxial thin films grown on SrTiO 3 (STO) and BaTiO 3 (BTO) substrates is studied using polarized neutron reflectometry (PNR) and ferromagnetic resonance (FMR) techniques. In LCMO/BTO, PNR reveals a strongly suppressed magnetization of 300 kA/m, equivalent to a magnetic moment of 2 μB/Mn, throughout the LCMO layer, amounting to half the expected value. The largest suppression occurs near the interface with BTO, with magnetization values of 50 kA/m, equivalent to 0.3 μB/Mn. FMR is observable at 8.9 GHz only around the [110] crystallographic direction in thin LCMO/BTO. The resonance barely shifts as the applied field is rotated away from [110]. The FMR results are analyzed in terms of magnetoelastic anisotropy and compared to LCMO/STO grown under the same conditions. A two-layer magnetization model is proposed, based on strong out-of-plane anisotropy near the BTO interface and shown to qualitatively explain the main characteristics of the FMR results.

show abstract

Magnetoelectric Coupling in Ordered Arrays of Multilayered Heteroepitaxial BaTiO₃/CoFe₂O₄ Nanodots

Cited by 101 publications

References 31 publications

Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields

Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields

Directed Self-Assembly of Epitaxial CoFe₂O₄–BiFeO₃ Multiferroic Nanocomposites

Magnetoelastic coupling in La0.7Ca0.3MnO3/BaTiO
Alberca
¹
,
Nemes
²
,
Mompeán
³

et al. 2013
Phys. Rev. B
7
0
4
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Magnetoelectric Coupling in Ordered Arrays of Multilayered Heteroepitaxial BaTiO3/CoFe2O4 Nanodots

Cited by 101 publications

References 31 publications

Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields

Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields

Directed Self-Assembly of Epitaxial CoFe2O4–BiFeO3 Multiferroic Nanocomposites

Magnetoelastic coupling in La0.7Ca0.3MnO3/BaTiOAlberca1, Nemes2, Mompeán3 et al. 2013Phys. Rev. B7040View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Magnetoelectric Coupling in Ordered Arrays of Multilayered Heteroepitaxial BaTiO₃/CoFe₂O₄ Nanodots

Directed Self-Assembly of Epitaxial CoFe₂O₄–BiFeO₃ Multiferroic Nanocomposites

Magnetoelastic coupling in La0.7Ca0.3MnO3/BaTiO
Alberca
¹
,
Nemes
²
,
Mompeán
³

et al. 2013
Phys. Rev. B
7
0
4
0
View full text Add to dashboard Cite