Multiferroics: progress and prospects in thin films

Ramesh, R.; Spaldin, Nicola A.

doi:10.1142/9789814287005_0003

Cited by 212 publications

(217 citation statements)

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“…The former group includes BiFeO 3 (ref. 36) and hexagonal YMnO 3 (refs 37,38), which show relatively large spontaneous polarization and high ferroelectric/magnetic transition temperatures, albeit with weak coupling between polarization and magnetism. By contrast, type-II multiferroics inherently host strong ME coupling despite smaller ferroelectric polarization and lower transition temperature 38 .…”

Section: Magnetoelectricsmentioning

confidence: 99%

Emergent functions of quantum materials

2017

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Materials can harbour quantum many-body systems, most typically in the form of strongly correlated electrons in solids, that lead to novel and remarkable functions thanks to emergence-collective behaviours that arise from strong interactions among the elements. These include the Mott transition, high-temperature superconductivity, topological superconductivity, colossal magnetoresistance, giant magnetoelectric e ect, and topological insulators. These phenomena will probably be crucial for developing the next-generation quantum technologies that will meet the urgent technological demands for achieving a sustainable and safe society. Dissipationless electronics using topological currents and quantum spins, energy harvesting such as photovoltaics and thermoelectrics, and secure quantum computing and communication are the three major fields of applications working towards this goal. Here, we review the basic principles and the current status of the emergent phenomena and functions in materials from the viewpoint of strong correlation and topology.E mergence is a concept developed for many-body systems, indicating the properties, phenomena, and functions that never appear in the individual elements but are realized only when a huge number of elements get together 1 . Inside materials, emergent phenomena are often seen due to the interaction of electronic states; with recent developments on electronic states in solids schematically summarized in Fig. 1a. Electrons in solids have several degrees of freedom: charge, spin and orbital, and are characterized by the topological nature determined by the atomic potential on the crystal lattice structure, as schematically shown in Fig. 1b. These five attributes are coupled together and determine the overall responses to stimuli, which appear as materials' electrical, magnetic, optical, thermal, and mechanical properties.These collective electrons demonstrate various macroscopic quantum phenomena, the representative example of which is superconductivity. One of the big challenges in condensed matter physics is to increase the temperature (T c ) at which superconductivity can be observed to above room temperature. However, there are many other macroscopic quantum phenomena that are already observable above room temperature. One is magnetism (by the Bohr-van Leeuwen theorem), and the other is ferroelectricity 2,3 . Remarkably, there are common features of these three macroscopic quantum phenomena: the order parameter, which is of quantum origin, behaves as a classical quantity, and the quantum topology plays a crucial role.The topological nature of the electronic states is the key concept in the most recent developments in understanding quantum materials. The quantum Hall effect, topological insulators, and topological superconductors are all characterized by nontrivial topologies in Hilbert space. The Berry phase, which describes the connection and curvature of the subspace of Hilbert space, plays the central role in the unified principle to describe this topological nature 4 . ...

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Section: Magnetoelectricsmentioning

confidence: 99%

Emergent functions of quantum materials

2017

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“…7) or an electric field can modify antiferromagnetic order (BiFeO 3 ) [8][9][10] . There are few ferromagnetic piezoelectric materials 11 in which to attempt voltage-driven changes in magnetization, but the magnetization of thin ferromagnetic films may be electrically modified via strain from piezoelectric substrates (BaTiO 3 19 ; or via the occupation of 3d orbitals in ultra-thin Fe films 20 .…”

Section: Between Ferroelectricmentioning

confidence: 99%

Non-volatile electrically-driven repeatable magnetization reversal with no applied magnetic field

et al. 2013

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Repeatable magnetization reversal under purely electrical control remains the outstanding goal in magnetoelectrics. Here we use magnetic force microscopy to study a commercially manufactured multilayer capacitor that displays strain-mediated coupling between magnetostrictive Ni electrodes and piezoelectric BaTiO 3 -based dielectric layers. In an electrode exposed by polishing approximately normal to the layers, we find a perpendicularly magnetized feature that exhibits non-volatile electrically driven repeatable magnetization reversal with no applied magnetic field. Using micromagnetic modelling, we interpret this nominally full magnetization reversal in terms of a dynamic precession that is triggered by strain from voltage-driven ferroelectric switching that is fast and reversible. The anisotropy field responsible for the perpendicular magnetization is reversed by the electrically driven magnetic switching, which is, therefore, repeatable. Our demonstration of non-volatile magnetic switching via volatile ferroelectric switching may inspire the design of fatigue-free devices for electric-write magnetic-read data storage.

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“…Also, the coupling effect of electrical and magnetic order parameters gives a rise to a wide range of novel applications, such as in magnetic sensors, transformers, multiple state memories and microwave devices [1][2][3][4]. Among all multiferroics, BiFeO 3 (BFO) is well-known as one of the most promising materials for device applications due to its high Curie temperature (T C ~ 1103K) and antiferromagnetic temperature (T N ~ 643K) [5,6].…”

Section: Introductionmentioning

confidence: 99%

FABRICATION AND PROPERTIES OF Co DOPED Bi0.5K0.5TiO3 – BiFeO3 SOLID SOLUTION

Tuấn¹

2018

JST

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In this study, we present some results on the structure and properties of the solid solution of Bi 0.5 K 0.5 TiO 3 -BiFeCoO 3 (BKT -BFCO) by Sol-gel method. Crystal structures of BKT -BFCO solid solutions were studies by XRD and Raman spectroscopy. The results were in good agreement with the previous reports of Bi 0.5 K 0.5 TiO 3 -BiFeO 3 (BKT -BFO) and Bi 0.5 K 0.5 TiO 3 -BiCoO 3 (BKT -BCO) solid solutions. The magnetic properties were investigated via unsaturated M-H loop, which showed the competition of paramagnetic and antiferromagnetic ordering in BKT -BFCO. However, differing from the BKT -BFO and BKT -BCO solid solutions, the unclear values of saturated magnetism in BKT -BFCO raised the unexplained question, which needed further studies.

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Multiferroics: progress and prospects in thin films

Cited by 212 publications

References 0 publications

Emergent functions of quantum materials

Emergent functions of quantum materials

Non-volatile electrically-driven repeatable magnetization reversal with no applied magnetic field

FABRICATION AND PROPERTIES OF Co DOPED Bi0.5K0.5TiO3 – BiFeO3 SOLID SOLUTION

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