Article
Chemistry, Multidisciplinary
Shanquan Chen, Shuai Yuan, Zhipeng Hou, Yunlong Tang, Jinping Zhang, Tao Wang, Kang Li, Weiwei Zhao, Xingjun Liu, Lang Chen, Lane W. Martin, Zuhuang Chen
Summary: The paper explores recent advances in the study of topological spin/polarization structures in ferroic materials, including the evolution of topological spin structures and exotic polar topologies in magnetic thin films and ferroelectric oxide films. It discusses the control of these structures and emergent phenomena through factors such as epitaxial strain, layer thickness, electric fields, and magnetic fields. Additionally, the paper provides a brief overview and prospectus for the future development of the field in the coming years.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Soumen Pradhan, Oleg I. Lebedev, Martando Rath, Fabien Veillon, Wilfrid Prellier, M. S. Ramachandra Rao
Summary: The MC performance in SLs of pure ferroelectric and ferromagnetic sublayers for multiferroic applications was investigated. Different behaviors were observed in SLs with different LSMO sublayer thicknesses including high strain, different lattice matching, spin-glass behavior, and insulator-metal transition. The capacitance and magnetocapacitance were well explained by the MR coupled Maxwell-Wagner relaxation model. A large magnetocapacitance was observed in the SL with optimum LSMO sublayer thickness.
Review
Nanoscience & Nanotechnology
Massimo Ghidini, Fancesco Maccherozzi, Sarnjeet S. Dhesi, Neil D. Mathur
Summary: The authors discuss and compare two complementary techniques commonly used to image ferromagnetic and ferroelectric materials with high spatial resolutions. They showcase their own and other published/unpublished XPEEM and MFM images of ferroic domains and complex magnetic textures. The highlights include the creation of 2D vector maps of in-plane magnetization using XPEEM images, and the detection of electrically driven local reversals of magnetization through imaging.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Andres Camilo Garcia-Castro, Yanjun Ma, Zachary Romestan, Eric Bousquet, Cheng Cen, Aldo H. Romero
Summary: The discovery of room-temperature multiferroic orders in multi-anion SrNbO3-xNx thin films reveals a new design strategy for multiferroism via multi-anion engineering. The findings not only expand the pool of available multiferroic materials but also shed light on the potential for energy-efficient electrical control of magnetism through strong correlations between different material degrees of freedom.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Ceramics
Jae-Hyeon Cho, Seongwoo Cho, Jun Han Lee, Haribabu Palneedi, Ju-Hyeon Lee, Hwang-Pill Kim, Nyun Jong Lee, Siriporn Tigunta, Soodkhet Pojprapai, Sanghoon Kim, Jungho Ryu, Yoon Seok Oh, Seungbum Hong, Wook Jo
Summary: Intentional subtraction of Fe ions in NiFe2O4 induces spin canting and enhances magnetoelectric coupling, while also generating ferroelectricity. The peak enhancement in magnetoelectric coupling strength is observed when about 30% of Fe ions are subtracted, after which further removal of Fe ions affects the material's structure.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Pedro Martins, Ana C. Lima, Victor A. L'vov, Nelson Pereira, Pimpet Sratong-on, Hideki Hosoda, Volodymyr Chernenko, Senentxu Lanceros-Mendez
Summary: This study demonstrates a significant resonance amplification of the ME effect by incorporating Ni-Mn-Ga particles into P(VDF-TrFE) piezopolymer, resulting in a giant ME coefficient of 6.05 V.cm(-1) under specific magnetic fields. The physical mechanism behind this enhancement involves the volume magnetostriction of the magnetostrictive particles and the resonant elastic oscillation of the piezoelectric polymer matrix.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Physical
A. Trukhanov, V. A. Turchenko, V. G. Kostishin, F. Damay, F. Porcher, N. Lupu, B. Bozzo, I Fina, S. Polosan, M. Silibin, M. M. Salem, D. Tishkevich, S. Trukhanov
Summary: The local crystal/magnetic structures of SrFe12-xInxO19 solid solutions were investigated using neutron powder diffraction, revealing the presence of ferroelectric and ferromagnetic ordering. The existence of a nonzero dipole moment in SrFe12-xInxO19 hexaferrites remains controversial, with a possible connection to unequal distortions of neighbor oxygen polyhedra. The formation of the nonzero dipole moment in In-substituted SrFe12-xInxO19 hexaferrites was described based on neutron diffraction data.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Shahran Ahmed, A. K. M. Sarwar Hossain Faysal, M. N. Khan, M. A. Basith, Muhammad Shahriar Bashar, H. N. Das, Tarique Hasan, Imtiaz Ahmed
Summary: This study synthesized various materials using solid state reaction technique and investigated their structural, electrical, and magnetic properties. Zr and Ni doping significantly affected the grain size and chemical composition of the samples, while unique characteristics of the samples were discovered through phenomena such as forbidden first order Raman scattering.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Ceramics
Jae-Hyeon Cho, Yu Jin Kim, Su Hwan Kim, Young-Jin Lee, Jun-Yong Choi, Geon-Tae Hwang, Jungho Ryu, Sang Kyu Kwak, Wook Jo
Summary: The study found that manipulating spin canting through composition-induced structural transition in nickel-zinc ferrite can enhance magnetoelectric coupling efficiency. The ME coefficient was maximized at 60% Zn substitution, showing about 70% enhancement compared to pure nickel ferrite.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Pankhuri Bansal, Manoj Kumar, Rajat Syal, Arun Kumar Singh, Sanjeev Kumar
Summary: In this study, particulate composites of (1 - x)Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT)-xNi(0.8)Zn(0.2)Fe(2)O(4 )(NZFO) were prepared by the conventional solid-state method with x values of 0.2, 0.3, and 0.4. The composites exhibited mixed spinel-perovskite phases, and changes in dielectric properties, magnetic behavior, and magnetoelectric coupling were observed with variations in ferrite content. The highest magnetoelectric coupling coefficient was found in the x = 0.4 composite.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Volker Neu, Ivan Soldatov, Rudolf Schaefer, Dmitriy D. Karnaushenko, Alaleh Mirhajivarzaneh, Daniil Karnaushenko, Oliver G. Schmidt
Summary: The method presented allows the creation of new, metastable multidomain patterns with tailored wall configurations through a self-assembled geometrical transformation, offering unparalleled possibilities for designing new magnetic or other ferroic micropatterns.
Article
Nanoscience & Nanotechnology
Stephen S. Sasaki, Oleg G. Udalov, Jeffrey A. Kurish, Momoko Ishii, Igor S. Beloborodov, Sarah H. Tolbert
Summary: In this work, a granular multiferroic composite is demonstrated where the magnetic state of nanocrystals is modified by tuning the interparticle exchange coupling using an applied electric field. The findings suggest that by changing the local dielectric environment, the ensemble magnetic coercivity and the superparamagnetic-to-ferromagnetic phase transition temperature can be controlled. This study is important for the development of new multiferroic materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Cheng Tang, Lei Zhang, Stefano Sanvito, Aijun Du
Summary: A general strategy for achieving 2D triferroicity by imposing electric polarization into a ferroelastic magnet is proposed in this study, and dual transition-metal dichalcogenides, such as 1T'-CrCoS4, are demonstrated to display room temperature triferroicity. The 1T'-CrCoS4 monolayer shows negative out-of-plane piezoelectricity and strain-tunable magnetic anisotropy, making it a strong candidate for practical applications. This research introduces a new class of 2D room-temperature triferroic materials, providing a promising platform for advanced spintronics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Moein Adnani, Melissa Gooch, Liangzi Deng, Stefano Agrestini, Javier Herrero-Martin, Hung-Cheng Wu, Chung-Kai Chang, Taha Salavati-fard, Narayan Poudel, Jose Luis Garcia-Munoz, Samira Daneshmandi, Zheng Wu, Lars C. Grabow, Yen-Chung Lai, Hung-Duen Yang, Eric Pellegrin, Ching-Wu Chu
Summary: HoFeWO6 exhibits multiferroicity and magnetoelectric (ME) coupling, with electric polarization onset at 17.8 K and antiferromagnetic ordering. The compound shows metamagnetic behavior at low temperatures directly related to dielectric properties, with a magnetocapacitance (MC) effect observed. X-ray diffraction results confirm the noncentrosymmetric polar structure and suggest Fe3+ cations are antiferromagnetically ordered in a noncollinear fashion. The observed MC effect, change in polarization by magnetic field, and direct correspondence with magnetization support strong ME coupling in HoFeWO6.
Article
Materials Science, Multidisciplinary
Valeri Petkov, Sarvjit Shastri
Summary: Finite size effects on ferroic orders in BiFeO3 were studied, finding that nanoparticles smaller than 62 nm preserve their polar rhombohedral structure and develop ferromagnetism, enhancing magnetoelectric coupling. However, nanoparticles smaller than 17 nm become nonpolar cubic, ceasing to exhibit both ferroelectricity and ferromagnetism simultaneously.
Article
Chemistry, Multidisciplinary
Yooun Heo, Marin Alexe
Summary: Enhancing the piezoelectric property of BiFeO3 single crystals using light as a control parameter can result in a locally enhanced effective piezoelectric coefficient, d(zz), showing almost a sevenfold increase. This phenomenon is explained with theoretical models involving the bulk photovoltaic effect and Schottky barrier effect, and the role of open-circuit voltage and photocharge carrier density. These results offer key insights into light-induced piezoelectricity enhancement for potential multifunctional optoelectronic devices.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Weng Heng Liew, Yunjie Chen, Marin Alexe, Kui Yao
Summary: This research reports a strategy to achieve high rate dynamic photostrictive strain by utilizing local fast responses under modulating continuous light excitation in the resonance condition. The experimental results demonstrate a high strain rate under continuous light excitation and significant photostrictive response even in depoled ferroelectric materials.
Article
Multidisciplinary Sciences
Mads C. Weber, Mael Guennou, Donald M. Evans, Constance Toulouse, Arkadiy Simonov, Yevheniia Kholina, Xiaoxuan Ma, Wei Ren, Shixun Cao, Michael A. Carpenter, Brahim Dkhil, Manfred Fiebig, Jens Kreisel
Summary: This article explores the phenomenon of spin-phonon coupling in SmFeO3. The study finds that a strong spin-phonon coupling effect occurs when both iron and samarium magnetic orders are present. This coupling is induced by the magnetism of iron rather than occurring spontaneously. The findings provide a new approach for discovering unknown properties.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Hang-Bo Zhang, Marin Alexe
Summary: The optoelectronic properties of bismuth ferrite thin films can be tuned by the interface between the film and the strontium titanate substrate. Defects, particularly oxygen vacancies, play a crucial role in the photoelectric properties of the film-substrate system. These results provide a new strategy for designing optoelectronic devices by utilizing defect doping and interface coupling.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Maximilian Kissel, Lukas Porz, Till Froemling, Atsutomo Nakamura, Juergen Roedel, Marin Alexe
Summary: This study reveals that dislocations in oxide semiconductors can enhance the photoconductivity and result in different global photoconductivity behavior. Additionally, indications for a bulk photovoltaic effect enabled by dislocation-surrounding strain fields are observed for the first time.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
C. M. Fernandez-Posada, C. R. S. Haines, D. M. Evans, Z. Yan, E. Bourret, D. Meier, M. A. Carpenter
Summary: The strength and dynamics of magnetoelastic coupling in multiferroic hexagonal ErMnO3 have been investigated through Resonant Ultrasound Spectroscopy. Elastic stiffening and softening are observed during the paramagnetic-antiferromagnetic and antiferromagnetic-ferrimagnetic transitions, respectively. The variation in elastic properties during poling is attributed to piezomagnetic and/or piezoelectric effects. Additionally, changes in acoustic resonance frequencies allow for the detection of ferroelectric domain reconfiguration. A peak in acoustic loss at around 250 K is associated with strain-mediated pinning/freezing of the domain microstructure.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Lukas Puntigam, Markus Altthaler, Somnath Ghara, Lilian Prodan, Vladimir Tsurkan, Stephan Krohns, Istvan Kezsmarki, Donald M. Evans
Summary: Rewritable nanoelectronics have great potential in fundamental research and technological applications. This study focuses on conductive domain walls and demonstrates enhanced conductivity in narrow-gap correlated insulators due to local strain gradients, expanding the range of materials applicable to domain wall-based nanoelectronics.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
Hang-Bo Zhang, Marin Alexe
Summary: The lack of a center of symmetry in oxides makes them highly sought after due to their fascinating physical properties. However, there are limited numbers of noncentrosymmetric media in nature, and most of them lack integrated multiple functionalities. Through the use of the bulk photovoltaic effect, it has been shown that strontium titanate (SrTiO3) exhibits polarity at interfaces with a wide range of oxides, breaking inversion symmetry in the quantum paraelectric phase. Conductivity and the bulk photovoltaic effect studies on LaAlO3/SrTiO3 thin films further reveal that appropriate band bending at the interface is crucial in controlling symmetry breaking. The polar interface under illumination at low temperatures exhibits conductivity or metallic behavior, allowing for multifunctionality coupling between oxides and SrTiO3.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Hang-Bo Zhang, Marin Alexe
Summary: The bulk photovoltaic effect has the potential to surpass the current theoretical limits of solar cells. However, there is limited understanding of the inner properties of materials with this effect, hindering its further development. In this study, the transport properties of the bulk photovoltaic effect in a BiFeO3/SrTiO3 heterostructure were investigated using the Hall effect. The results provide important insights into the fundamental characteristics of the bulk photovoltaic effect and suggest a potential ballistic transport mechanism.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Applied
Lilian Prodan, Donald M. Evans, Sinead M. Griffin, Andreas Oestlin, Markus Altthaler, Erik Lysne, Irina G. Filippova, Sergiu Shova, Liviu Chioncel, Vladimir Tsurkan, Istvan Kezsmarki
Summary: We investigated the magnetic anisotropy of Fe3Sn kagome bilayer ferromagnet using bulk magnetometry and magnetic force microscopy. The magnetization dependence on the orientation of the external magnetic field showed strong easyplane magnetocrystalline anisotropy and anisotropy of the saturation magnetization. Ab initio electronic structure calculations and micromagnetic simulations agreed well with the experimental values, providing insights into the magnetic properties of Fe3Sn.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Mehrzad Soleimany, Marin Alexe
Summary: SrTiO3 crystals exhibit unique photoelectric characteristics, including non-linear electron transport and voltage-controlled negative resistance, when excited by light. The negative resistance leads to the instability of the photocurrent and the spontaneous generation of low-frequency Gunn-like oscillations.
Article
Chemistry, Multidisciplinary
Ola G. Grendal, Donald M. Evans, Solveig S. Aamlid
Summary: This study revisits the structures and phase transitions of Ba2NaNb5O15 (BNN) using high-resolution X-ray and neutron powder diffraction combined with density functional theory calculations. The results show that BNN has an average structure described by the Ama2 space group, and no other structural phase transitions were observed. Symmetry mode analysis reveals significant octahedral tilting and corrugations, and a strong correlation between spontaneous strain and octahedral tilting was observed.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Materials Science, Multidisciplinary
Hang-Bo Zhang, Ming-Min Yang, Marin Alexe
Summary: In this study, a large photocurrent was detected only in the stripe domain structure of BiFeO3 thin films. The temperature-resolved time-dependent photocurrent measurements revealed a significant trapping effect associated with the abnormal photocurrent. Furthermore, optoelectronic measurements with tuned defect density unveiled the essential interaction between defects and domain walls in generating a large photocurrent in BiFeO3 thin films.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Florian Mayer, Maxim N. Popov, Donald M. Evans, Stephan Krohns, Marco Deluca, Jurgen Spitaler
Summary: By calculating the anharmonic contributions to the potential energy surface, the quality of molecular dynamics simulations of barium titanate can be improved, leading to more accurate predictions of physical properties such as phase transition temperatures. This approach can also be applied to other perovskite structures.
Article
Materials Science, Multidisciplinary
Donald M. Evans, Ola G. Grendal, L. Prodan, Maximilian Winkler, Noah Winterhalter-Stocker, Philipp Gegenwart, Somnath Ghara, Joachim Deisenhofer, Istvan Kezsmarki, V. Tsurkan
Summary: In this study, we used high-resolution synchrotron powder diffraction to investigate the evolution of the crystal structure of FeCr2S4. The results revealed a cubic to tetragonal transition at around 65K, followed by a polar transition at around 9K, resulting in a multiferroic compound. These findings provide a basis for understanding the properties of FeCr2S4 and highlight the importance of structural deformation in correlated materials.
