Article
Materials Science, Multidisciplinary
J. Trimble, J. Berezovsky
Summary: The study demonstrates a magneto-optical microscopy technique to observe the pinning behavior of a vortex state in a magnetic film, revealing the trapping effect of defects and inhomogeneities on high-energy-density magnetization configurations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
Sandra Ruiz-Gomez, Anna Mandziak, Laura Martin-Garcia, Jose Emilio Prieto, Pilar Prieto, Carmen Munuera, Michael Foerster, Adrian Quesada, Lucia Aballe, Juan de la Figuera
Summary: This study conducted a detailed analysis of the structural, magnetic, and chemical properties of non-stoichiometric cobalt ferrite micrometric crystals. With the use of advanced techniques such as x-ray magnetic circular dichroism, photoemission microscopy, low-energy electron microscopy, and atomic force microscopy, the magnetization vector inside the crystals was resolved at the nanoscale, and the location of magnetic domain walls was correlated with different types of defects. The findings are crucial for understanding the magnetic properties of thin films and nanostructures.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Surbhi Gupta, Madhuparna Pal, Monika Tomar, Ruyan Guo, Amar Bhalla, Vinay Gupta
Summary: The simultaneous presence of ferroelectric and magnetic ordering at room temperature in multiferroics has attracted significant interest for potential applications in low-power sensors, transducers, and memory devices. This study focused on investigating the ferroelectric and magnetic domain mapping of Bi1-XCeXFeO3 thin films, and discussed the concentration-dependent behavior of piezo-response, phase reversal, and magneto-dielectric coupling. The results showed improved ferroelectric ordering in polycrystalline BCFO0.12 thin film, with a large piezo-response amplitude change, near complete phase reversal, and enhanced magneto-dielectric coupling coefficient at 0.3 T.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Akira Sugawara, Tetsuya Akashi
Summary: The investigation delved into the nucleation of reverse domains and domain-wall propagation in anisotropic Nd-Fe-B sintered-magnet specimens. Different types of domain-wall structures play crucial roles in magnetization reversal, with head-on DWs showing lower stability when pinned at c-plane GBs.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yongtao Liu, Roger Proksch, Chun Yin Wong, Maxim Ziatdinov, Sergei Kalinin
Summary: This study explored domain dynamics in model polycrystalline materials using deep learning and rVAE methods. The research found that these methods can be used to unambiguously identify and classify ferroelectric and ferroelastic domain walls, providing insights into the intrinsic mechanisms of polarization switching.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Sebastian M. J. Beer, Arbresha Muriqi, Patrick Lindner, Manuela Winter, Detlef Rogalla, Michael Nolan, Andreas Ney, Jorg Debus, Anjana Devi
Summary: Europium sulfide (EuS) thin films grown via chemical vapor deposition (CVD) exhibit high quality, stoichiometry, and tunability, with the advantage of avoiding the use of toxic hydrogen sulfide.
CHEMISTRY OF MATERIALS
(2022)
Article
Physics, Applied
Rohan Jaiswal, Vemuru Haragopal, Chandrasekhar Murapaka, Vijayanandhini Kannan
Summary: The effect of vortex domain wall (VDW) chirality on the splitting and recombination process in ferromagnetic nanowire with an anti-dot was investigated. The chirality determines whether a 360 degrees domain wall is formed or annihilated. The splitting and recombination process is independent of the chirality when the anti-dot width is below 100 nm.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Materials Science, Multidisciplinary
Sopheak Sorn, Arun Paramekanti
Summary: In this study, transport in the presence of magnetic domain walls in a lattice model of ferromagnetic type-I Weyl metals was investigated. The study revealed the effect of DW scattering, particularly a strong skew scattering at the DW near Weyl points leading to a significant additional Hall effect. The findings are potentially relevant for understanding the Hall resistivity of spin-orbit coupled ferromagnetic metals with Weyl points near the Fermi energy, such as Co3Sn2S2, Co2MnGa, and SrRuO3.
Article
Chemistry, Multidisciplinary
C. Bran, J. A. Fernandez-Roldan, J. A. Moreno, A. Fraile Rodriguez, R. P. del Real, A. Asenjo, E. Saugar, J. Marques-Marchan, H. Mohammed, M. Foerster, L. Aballe, J. Kosel, M. Vazquez, O. Chubykalo-Fesenko
Summary: This study investigates the dynamics of domain walls in cylindrical magnetic Ni nanowires with geometrical notches. Experimental results show that larger current densities induce domain wall nucleation, while smaller currents preferentially move domain walls in the antiparallel direction to the current. Thermal modeling suggests that larger current densities temporarily raise the temperature in the nanowire above the Curie temperature, resulting in the nucleation of domain walls during system cooling. Micromagnetic modeling reveals that for intermediate current densities, Bloch point domain walls with chirality parallel to the Oersted field propagate antiparallel to the current direction.
Article
Chemistry, Physical
Huiying Liu, LingXu Wang, Zhibiao Ma, Xiaodong Guo, Bingdong Yao, Yangyang Wang, Yan Liu, Fengqing Zhang, Luyi Zhu
Summary: Epitaxial growth of BiFe0.95Mn0.05O3 (BFMO) thin films on single crystal substrates with different orientations was achieved by sol-gel and layer-by-layer rapid thermal annealing methods. The structure and aging behavior of the films were analyzed using various test techniques.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Naveen Aruchamy, Tony Schenk, Veronika Kovacova, Sebastjan Glinsek, Emmanuel Defay, Torsten Granzow
Summary: Novel applications of ferroelectric films require different substrates that exert varying mechanical stress on the film, leading to questions about the reliability of differently stressed films. This study compares the fatigue behavior of PZT films under different stress states, revealing that tensile stress causes gradual degradation while compressive stress leads to abrupt degradation. The main fatigue mechanism is domain wall pinning on charged defects.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Cristian M. Teodorescu
Summary: This study revisits Kittel's theory of ferromagnetic domains in thin films and extends it to two-dimensional domain landscapes. The most stable structure for thin films with perpendicular magnetic anisotropy is found to be one-dimensional domains, while for in-plane magnetized thin films, the domain size depends on the film thickness and stripe lateral size. The hysteresis curves exhibit different two-dimensional or one-dimensional structures depending on the magnetization level.
RESULTS IN PHYSICS
(2023)
Article
Mathematics, Applied
Chiranjeev K. Shahu, Shruti Dubey
Summary: This work investigates the static and dynamic features of transverse domain walls in a magnetostrictive, linear elastic isotropic ferromagnetic material under the action of magnetic field and electric current. The effects of stresses induced by a piezoelectric actuator and Rashba spin-orbit torque caused by structural inversion asymmetry are considered. The study derives the explicit expression of key quantities such as domain wall profile, velocity, mobility, and displacement, and confirms the agreement of the analytical results with numerical simulations and experimental observations.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Multidisciplinary Sciences
Vemuru Haragopal, Rohan Jaiswal, Chandrasekhar Murapaka, Vijayanandhini Kannan
Summary: In this work, the motion of vortex domain wall (VDW) in a ferromagnetic nanowire with a rectangular anti-dot was studied using micromagnetic simulations. It was found that the anti-dot can act as a pinning site, causing the VDW to either split or transform into a transverse domain wall (TDW), depending on the width of the anti-dot. The splitting and recombination of the VDW resulted in the formation of a 360(degrees) DW. The energy distribution across the TDW was found to play a crucial role in the splitting of the DW and the formation of the 360(degrees) DW. The DW splitting field showed a crossover as a function of the anti-dot width, which was attributed to the dependence of pinning field on the DW size.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Jian Song, Mingyu Gong, Meng-fu Tsai, Youcao Ma, Houyu Ma, Yue Liu, Ying-hao Chu, Rong Huang, Jun Ouyang, Jian Wang, Tongxiang Fan
Summary: By using atomistic simulation and microscopy characterization, a pseudo-ferroelectric domain with similar morphology to a ferroelectric domain but with the same defect character as a ferroelastic domain-wall, i.e., a semi-coherent (100)(matrix)||(100)(domain) interface, is identified. Pseudo-ferroelectric domain walls play a critical role in the migration kinetics of ferroelastic domains and the piezoelectric responses of ferroelectric thin films during cyclic mechanical/electrical loading.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
R. Badea, M. S. Wolf, J. Berezovsky
APPLIED PHYSICS LETTERS
(2016)
Article
Physics, Applied
R. Badea, J. Berezovsky
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Physics, Applied
R. Badea, E. Haber, J. Berezovsky
PHYSICAL REVIEW APPLIED
(2018)
Article
Physics, Multidisciplinary
Mohamed ElKabbash, Ermanno Miele, Ahmad K. Fumani, Michael S. Wolf, Angelo Bozzola, Elisha Haber, Tigran Shahbazyan, Jesse Berezovsky, Francesco De Angelis, Giuseppe Strangi
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Jesse Berezovsky
Article
Optics
Mahdi Mehrnia, Jeremy Trimble, Jesse Berezovsky
Article
Physics, Applied
H. Mattiat, N. Rossi, B. Gross, J. Pablo-Navarro, C. Magen, R. Badea, J. Berezovsky, J. M. De Teresa, M. Poggio
PHYSICAL REVIEW APPLIED
(2020)
Article
Materials Science, Multidisciplinary
J. Trimble, J. Berezovsky
Summary: The study demonstrates a magneto-optical microscopy technique to observe the pinning behavior of a vortex state in a magnetic film, revealing the trapping effect of defects and inhomogeneities on high-energy-density magnetization configurations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Applied
Yanan Wang, Jaesung Lee, Jesse Berezovsky, Philip X. -L. Feng
Summary: Hexagonal boron nitride (h-BN) is a widely used insulating crystal in 2D nanoelectronics and nanoelectromechanical systems, and has recently been identified as a promising platform for quantum photonics. By utilizing optically active defect centers, h-BN single photon emitters (SPEs) have been studied in microdisk resonators. The exceptional characteristics of h-BN SPEs at room temperature make them crucial for applications such as low-threshold microcavity lasers and high-purity single photon sources.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
J. Trimble, B. Gould, F. J. Heremans, S. S. -L. Zhang, D. D. Awschalom, J. Berezovsky
Summary: By exciting the gyrotropic mode of a magnetic vortex, researchers observed enhanced relaxation of the NV spin, attributed to the magnetic fringe field arising from the soliton-like nature of the gyrotropic mode.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Mahdi Mehrnia, Jeremy Trimble, Olle Heinonen, Jesse Berezovsky
Summary: The interaction between the vortex core and manufactured nanoscale defects in the magnetic material reduces the driving strength required for core polarity reversal. By exciting vortex dynamics in thin permalloy disks, researchers were able to observe two-dimensional motion of the vortex core trajectory.
PHYSICAL REVIEW APPLIED
(2021)
Article
Multidisciplinary Sciences
Huay Din, Jesse Berezovsky
Summary: We investigate the critical phenomena and ordered phase structure of musical harmony using a statistical mechanics model on a 3D lattice. Through numerical simulation, we observe a phase transition from disorder to order as a parameter similar to temperature is reduced. We also observe the formation of vortex strings as topological defects in the low-temperature phase, and explore their structure in the context of music theory.
Article
Quantum Science & Technology
R. Badea, M. S. Wolf, J. Berezovsky
Summary: We study experimentally and numerically the implementation of 7r/2 rotations of a single nitrogen-vacancy defect spin state near a magnetic vortex core. The controlled dynamics of the vortex core can offer rapidly-tunable magnetic fields for spin qubit control, but the non-equilibrium dynamics of the vortex core complicate high-fidelity gate operations. The complex profile of the driven vortex core fringe field leads to unpredictable enhancement of Zeeman splitting and Rabi frequency, and the gyrotropic dynamics of the vortex core result in a complicated evolution of the spin state. Adiabatic passage protocol is shown to improve the fidelity of pi/2 rotations by enhancing spin splitting and Rabi frequency while suppressing unwanted vortex dynamics.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Mahdi Mehrnia, Jeremy Trimble, Jesse Berezovsky
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Materials Science, Multidisciplinary
M. S. Wolf, R. Badea, M. Tader, J. Berezovsky