Electric control of magnetism at the Fe/BaTiO3 interface

Radaelli, Greta; Petti, Daniela; Plekhanov, Evgeny; Fina, Ignasi; Torelli, Piero; Salles, B. Rache; Cantoni, Matteo; Rinaldi, Christian; Gutiérrez, Diego; Panaccione, G.; Varela, M.; Picozzi, Silvia; Fontcuberta, J.; Bertacco, Riccardo

doi:10.1038/ncomms4404

Cited by 190 publications

(162 citation statements)

References 47 publications

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“…Similarly, magnetoelectric coupling can emerge at the interfaces. [375][376][377] Finally, in the last several years progressively more attention has been paid to the coupling between physical and electrochemical phenomena in oxides, especially pronounced in nanoscale systems 278,279,[378][379][380][381] Similarly to the magnetoelectricity and electronic transport, the coupling between ferroelectric functionality and (electro)chemistry can be bulk and interface driven. In the bulk, Morozovska 382 analyzed the case of Vegard strain changing the sign of the first term in the Landau expansion, resulting in a ferroelectric phase transition.…”

Section: Phenomenamentioning

confidence: 99%

Ferroelectric or non-ferroelectric: Why so many materials exhibit “ferroelectricity” on the nanoscale

Vasudevan

Balke

Maksymovych

et al. 2017

Applied Physics Reviews

250

203

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Ferroelectric materials have remained one of the foci of condensed matter physics and materials science for over 50 years. In the last 20 years, the development of voltage-modulated scanning probe microscopy techniques, exemplified by Piezoresponse force microscopy (PFM) and associated time-and voltage spectroscopies, opened a pathway to explore these materials on a single-digit nanometer level. Consequently, domain structures, walls and polarization dynamics can now be imaged in real space. More generally, PFM has allowed studying electromechanical coupling in a broad variety of materials ranging from ionics to biological systems. It can also be anticipated that the recent Nobel prize 1 in molecular electromechanical machines will result in rapid growth in interest in PFM as a method to probe their behavior on single device and device assembly levels. However, the broad introduction of PFM also resulted in a growing number of reports on nearly-ubiquitous presence of ferroelectric-like phenomena including remnant polar states and electromechanical hysteresis loops in materials which are non-ferroelectric in the bulk, or in cases where size effects are expected to suppress ferroelectricity. While in certain cases plausible physical mechanisms can be suggested, there is remarkable similarity in observed behaviors, irrespective of the materials system. In this review, we summarize the basic principles of PFM, briefly discuss the features of ferroelectric surfaces salient to PFM imaging and spectroscopy, and summarize existing reports on ferroelectric-like responses in non-classical ferroelectric materials. We further discuss possible mechanisms behind observed behaviors, and possible experimental strategies for their identification.3

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Section: Phenomenamentioning

confidence: 99%

Ferroelectric or non-ferroelectric: Why so many materials exhibit “ferroelectricity” on the nanoscale

Vasudevan

Balke

Maksymovych

et al. 2017

Applied Physics Reviews

250

203

View full text Add to dashboard Cite

show abstract

“…7 Recently, electric field effects on magnetic properties were demonstrated in all-solid-state devices, exploiting mechanisms such as interfacial hybridization induced by a change in electronic d orbital population, magneto-electric coupling in multiferroics and accumulation of charges induced by ferroelectric polarization in artificial multiferroics. [8][9][10][11][12][13] On a parallel line, ion migration has been widely exploited in non-magnetic devices, e.g., made by an oxide layer sandwiched by two metallic layers, suitable for resistive switching technology. 14,15 The magneto-ionic effect, i.e., the electric control of magnetic properties mediated by ion migration, 16,17 is a physical phenomenon connecting these two fields.…”

mentioning

confidence: 99%

Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy

Baldrati

Tan

Mann

et al. 2017

Applied Physics Letters

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The magneto-ionic effect is a promising method to control the magnetic properties electrically. Charged mobile oxygen ions can easily be driven by an electric field to modify the magnetic anisotropy of a ferromagnetic layer in contact with an ionic conductor in a solid-state device. In this paper, we report on the room temperature magneto-ionic modulation of the magnetic anisotropy of ultrathin CoFeB films in contact with a GdOx layer, as probed by polar micro-Magneto Optical Kerr Effect during the application of a voltage across patterned capacitors. Both Pt/CoFeB/GdOx films with perpendicular magnetic anisotropy and Ta/CoFeB/GdOx films with uniaxial in-plane magnetic anisotropy in the as-grown state exhibit a sizable dependence of the magnetic anisotropy on the voltage (amplitude, polarity, and time) applied across the oxide. In Pt/CoFeB/GdOx multilayers, it is possible to reorient the magnetic anisotropy from perpendicular-to-plane to in-plane, with a variation of the magnetic anisotropy energy greater than 0.2 mJ m−2. As for Ta/CoFeB/GdOx multilayers, magneto-ionic effects still lead to a sizable variation of the in-plane magnetic anisotropy, but the anisotropy axis remains in-plane.

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“…To overcome this limitation, the use of artificial 35 heterostructures combining ferromagnetic films with ferro-or 36 piezo-electric substrates has been explored [8][9][10][11][12].…”

mentioning

confidence: 99%

Strain-induced magnetization control in an oxide multiferroic heterostructure

et al. 2018

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Controlling magnetism by using electric fields is a goal of research towards novel spintronic devices and future nano-electronics. For this reason, multiferroic heterostructures attract much interest. Here we provide experimental evidence, and supporting DFT analysis, of a transition in La0.65Sr0.35MnO3 (LSMO) thin film to a stable ferromagnetic phase, that is induced by the structural and strain 2 properties of the ferroelectric BaTiO3 (BTO) substrate, which can be modified by applying external electric fields. X-ray Magnetic Circular Dichroism (XMCD) measurements on Mn L edges with a synchrotron radiation show, in fact two magnetic transitions as a function of temperature that correspond to structural changes of the BTO substrate. We also show that ferromagnetism, absent in the pristine condition at room temperature, can be established by electrically switching the BTO ferroelectric domains in the out-of-plane direction. The present results confirm that electrically induced strain can be exploited to control magnetism in multiferroic oxide heterostructures.

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Electric control of magnetism at the Fe/BaTiO3 interface

Cited by 190 publications

References 47 publications

Ferroelectric or non-ferroelectric: Why so many materials exhibit “ferroelectricity” on the nanoscale

Ferroelectric or non-ferroelectric: Why so many materials exhibit “ferroelectricity” on the nanoscale

Magneto-ionic effect in CoFeB thin films with in-plane and perpendicular-to-plane magnetic anisotropy

Strain-induced magnetization control in an oxide multiferroic heterostructure

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