Ferromagnetic resonance spectra of linear magnetosome chains

• Elizaveta M. Gubanova and
• Nikolai A. Usov

Beilstein J. Nanotechnol. 2024, 15, 157–167, doi:10.3762/bjnano.15.15

• correct interpretation of the FMR spectra, it is highly desirable to use the results of detailed micromagnetic modeling, which takes into account the main physical factors affecting the FMR spectra, including the effect of strong magnetic dipole interactions in magnetosome chains. Both magnetosomes grown

• strong magnetic dipole interactions between the particles of the chain, as well as the effect of thermal fluctuations of magnetic moments of nanoparticles at a finite temperature. Using this approach, in this paper the FMR spectra of oriented assemblies of linear chains of quasi-spherical magnetosomes

• the magnetic dipole interactions within the clusters. For example, at η = 0.308, when the average distance between particle centers in a dense random cluster is rather small, L = (π/6η)1/3D ≈ 1.2D, the width of the FMR spectrum of the assembly of random clusters at half maximum is approximately ΔH

Observation of multiple bulk bound states in the continuum modes in a photonic crystal cavity

• Rui Chen,
• Yi Zheng,
• Xingyu Huang,
• Qiaoling Lin,
• Chaochao Ye,
• Meng Xiong,
• Martijn Wubs,
• Yungui Ma,
• Minhao Pu and
• Sanshui Xiao

Beilstein J. Nanotechnol. 2023, 14, 544–551, doi:10.3762/bjnano.14.45

• field vectors. The annular E field distribution of the mode corresponds to a magnetic dipole (MD) with its dipole moment along the vertical direction. The symmetry nature of the MD is incompatible with the illumination waves. Hence, a BIC mode is formed at the Г point. By changing the in-plane k vector

• . The yellow dashed squares represent region A in the devices. The eigenmodes of the bandgap mirror-assisted finite-size BIC structure are calculated and shown in Figure 2d. This part of the simulation was performed using Ansys Lumerical FDTD. In the simulation, a magnetic dipole cloud with momentum

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

• Chaoying Shi,
• Jinhua Hu,
• Xiuhong Liu,
• Junfang Liang,
• Jijun Zhao,
• Haiyan Han and
• Qiaofen Zhu

Beilstein J. Nanotechnol. 2022, 13, 1408–1417, doi:10.3762/bjnano.13.116

• dominated by the electric toroidal dipole rather than the SP-BIC dominated by the magnetic dipole [46]. As a result, instead of having to break the symmetry of the structure, as in the case of SP-BIC, a simple change in the grating spacing can transform the BIC into a QBIC, leading to high-Q resonance. The

Plasmon-enhanced photoluminescence from TiO₂ and TeO₂ thin films doped by Eu³⁺ for optoelectronic applications

• Marcin Łapiński,
• Jakub Czubek,
• Katarzyna Drozdowska,
• Anna Synak,
• Wojciech Sadowski and
• Barbara Kościelska

Beilstein J. Nanotechnol. 2021, 12, 1271–1278, doi:10.3762/bjnano.12.94

• deposited on the plasmonic platform with a dielectric Al2O3 layer. The most intense peaks appear for films with 4 and 6 nm thickness. The emission spectra show only one significant peak at 591 nm. It corresponds to the 5D0→7F1 magnetic dipole transition. This type of transition is observed in

• caused by Al2O3 may successfully tune the optical properties of gold plasmonic nanostructures to obtain a more efficient excitation of the luminescent layer with europium ions. The characteristic narrow emission band at 591 nm was assigned to the 5D0→7F1 magnetic dipole transition in Eu3+ [40][41]. Its

• intensity is higher for samples with Au platforms than for the reference sample (TeO2:Eu) and reaches the greatest value for 4 nm of Al2O3 layer. In general, greater excitation of luminescent material leads to more efficient emission. The observed magnetic dipole transition is characteristic for a uniform

Hexagonal boron nitride: a review of the emerging material platform for single-photon sources and the spin–photon interface

• Stefania Castelletto,
• Faraz A. Inam,
• Shin-ichiro Sato and
• Alberto Boretti

Beilstein J. Nanotechnol. 2020, 11, 740–769, doi:10.3762/bjnano.11.61

Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields

• Nikolai A. Usov,
• Ruslan A. Rytov and
• Vasiliy A. Bautin

Beilstein J. Nanotechnol. 2019, 10, 2294–2303, doi:10.3762/bjnano.10.221

• magnetic dipole interaction between nanoparticles [27][28][29][30][31][32] on the energy absorption intensity. On the other hand, for particles distributed in a viscous liquid it is necessary to take into account [25] a coupled motion of the unit magnetization vector and the nanoparticle director that is

Targeted therapeutic effect against the breast cancer cell line MCF-7 with a CuFe₂O₄/silica/cisplatin nanocomposite formulation

• B. Rabindran Jermy,
• Vijaya Ravinayagam,
• Widyan A. Alamoudi,
• Dana Almohazey,
• Hatim Dafalla,
• Lina Hussain Allehaibi,
• Abdulhadi Baykal,
• Muhammet S. Toprak and
• Thirunavukkarasu Somanathan

Beilstein J. Nanotechnol. 2019, 10, 2217–2228, doi:10.3762/bjnano.10.214

• preparation of a copper nanoferrite using a citrate sol–gel technique [6]. In addition, several metal-based ferrite systems have been recently reported for bioscience applications [7]. Although spinel ferrite nanoparticles are interesting, due to the strong magnetic dipole–dipole interactions, they tend to

Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

• Alberto Boretti,
• Lorenzo Rosa,
• Jonathan Blackledge and
• Stefania Castelletto

Beilstein J. Nanotechnol. 2019, 10, 2128–2151, doi:10.3762/bjnano.10.207

• (MRFM). Among the other approaches, magnetic dipole interaction is a new way to replace magnetic induction to allow for nanoscale MRI detection and has delivered promising results in the employment of spin sensors based on atomic-scale diamond impurities. The use of diamond NV centers with nano-MRI has

Unipolar magnetic field pulses as an advantageous tool for ultrafast operations in superconducting Josephson “atoms”

• Daria V. Popolitova,
• Nikolay V. Klenov,
• Igor I. Soloviev,
• Sergey V. Bakurskiy and
• Olga V. Tikhonova

Beilstein J. Nanotechnol. 2019, 10, 1548–1558, doi:10.3762/bjnano.10.152

• the form of where γ is the quasi-energy of the system (Equation 7) and can be found from the equation Usually for real superconducting systems Δ ≪ ℏΩ and the coupling between qubit states V induced by a magnetic field is rather strong due to the huge value of the magnetic dipole moment. For these

Magnetic field-assisted assembly of iron oxide mesocrystals: a matter of nanoparticle shape and magnetic anisotropy

• Julian J. Brunner,
• Marina Krumova,
• Helmut Cölfen and
• Elena V. Sturm (née Rosseeva)

Beilstein J. Nanotechnol. 2019, 10, 894–900, doi:10.3762/bjnano.10.90

• alignment of the magnetic dipole between the nanocrystals and the nanocrystals will then tend to orient their easy axis along the direction of the magnetic field. The magnetic dipole of each nanocrystal will interact with those of the surrounding nanocrystals and they attract to each other with specific

Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode

• Valerio F. Gili,
• Lavinia Ghirardini,
• Davide Rocco,
• Giuseppe Marino,
• Ivan Favero,
• Iännis Roland,
• Giovanni Pellegrini,
• Lamberto Duò,
• Marco Finazzi,
• Luca Carletti,
• Andrea Locatelli,
• Aristide Lemaître,
• Dragomir Neshev,
• Costantino De Angelis,
• Giuseppe Leo and
• Michele Celebrano

Beilstein J. Nanotechnol. 2018, 9, 2306–2314, doi:10.3762/bjnano.9.215

• scattered power of the first five radiating multipole moments in the bare nanodisk (hybrid system) we computed the first five Cartesian multipole moments inside the cylinder using the expressions summarized in [40], where Pe, Md, Td, Qe and Qm indicate the electric dipole, magnetic dipole, toroidal dipole

• excited at correspondence with the magnetic dipole resonance at the fundamental wavelength, as measured in our previous works [38][41]. This experimental outcome, which is confirmed by our simulations, is the result of a trade-off situation. In fact, while the magnetic dipole resonance in the isolated

• ) Electric field vector map at 1550 nm for the proposed structure. b) Electric and c) magnetic field distribution in the hybrid nanoantenna at 1550 nm. d) The full multipolar decomposition of the first five contributing multipole moments: electric dipole (Pe), magnetic dipole (Md), toroidal dipole (Td

Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film

• Kalpana Singh,
• Evgeniy Panchenko,
• Babak Nasr,
• Amelia Liu,
• Lukas Wesemann,
• Timothy J. Davis and
• Ann Roberts

Beilstein J. Nanotechnol. 2018, 9, 1491–1500, doi:10.3762/bjnano.9.140

• structure is complementary to a trimer consisting of three rods with the lowest energy magnetic dipole mode being dark and the next highest energy modes being degenerate orthogonal dipole modes (see Supporting Information File 1). The dominant modes of this structure are a dark mode with radial symmetry

Excitation of nonradiating magnetic anapole states with azimuthally polarized vector beams

• Aristeidis G. Lamprianidis and
• Andrey E. Miroshnichenko

Beilstein J. Nanotechnol. 2018, 9, 1478–1490, doi:10.3762/bjnano.9.139

• comparable toroidal and electric dipoles might result in nonradiating anapole excitation [10][11][12][13][14]. It has a number of interesting features and can be used to design near-field laser [15], to obtain high-efficiency harmonic generation [16], to achieve pure magnetic dipole scattering without

• nanoparticles, in addition to multipolar modes of electric type, also support magnetic ones. In analogy with anapole excitations of electric type, one might also expect the existence of magnetic anapoles, associated with the vanishing scattering contribution of the magnetic dipole term. It now raises the

• . More specifically, the scattered field would be a superposition of VSHs of type , with the magnetic dipole, , corresponding to a dipole moment along the z-axis, mz, and the magnetic quadrupole, , corresponding to a Cartesian quadrupole moment , and so on. So, for demonstration purposes, we are going to

Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna

• Haitao Chen,
• Mingkai Liu,
• Lei Xu and
• Dragomir N. Neshev

Beilstein J. Nanotechnol. 2018, 9, 780–788, doi:10.3762/bjnano.9.71

• and Discussion Concept At resonances, the far-field radiation of the nanoantennna could be expanded into multipolar series. Equation 1 shows the first three terms, including the contribution of the electric dipole p, the electric quadrupole and the magnetic dipole m [43]: where k0 is the vacuum

High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces

• Jonathan Ward,
• Khosro Zangeneh Kamali,
• Lei Xu,
• Guoquan Zhang,
• Andrey E. Miroshnichenko and
• Mohsen Rahmani

Beilstein J. Nanotechnol. 2018, 9, 460–467, doi:10.3762/bjnano.9.44

• first Kerker condition. Within dielectric metasurfaces, it has been shown that an overlap of the electric and magnetic dipole resonances can generate a relatively broad spectral band Kerker condition [20][23][24]. In order to achieve high-performance compact optical devices with novel functionalities

• heating, in the wavelength range between 1150 and 1350 nm, the total scattering (Q) is determined mainly by the resonant excitations from magnetic dipole (MD) and magnetic quadrupole (MQ), and a small portion of excitation from electric quadrupole (EQ) and electric dipole (ED). These optically induced

Ferrocholesteric–ferronematic transitions induced by shear flow and magnetic field

• Dmitriy V. Makarov,
• Alexander A. Novikov and
• Alexander N. Zakhlevnykh

Beilstein J. Nanotechnol. 2017, 8, 2552–2561, doi:10.3762/bjnano.8.255

• ferrocholesteric. Because of the small volume fraction () of ferroparticles in the suspension, magnetic dipole–dipole interactions are neglected. The equation of the director motion has the form [13][27] where γ1 = α3 − α2 and γ2 = α3 + α2 are the coefficients of the rotational viscosity of a liquid crystal. The

Computing the T-matrix of a scattering object with multiple plane wave illuminations

• Martin Fruhnert,
• Ivan Fernandez-Corbaton,
• Vassilios Yannopapas and
• Carsten Rockstuhl

Beilstein J. Nanotechnol. 2017, 8, 614–626, doi:10.3762/bjnano.8.66

• if we want to consider the electric part or bnm if we consider the magnetic part, respectively. For example the electric and magnetic dipole contributions, which are usually the strongest contributions for electromagnetically small particles, read as Thus, if we know the scattering coefficients of an

• notable electric and magnetic dipole moment in the visible-light range. To calculate the T-matrix numerically we illuminate the sphere with the appropriate number of plane waves K. The wave vectors are chosen, such that they are evenly distributed in all directions. They can be considered as normal

• the dominant ones, we stop the procedure. As depicted in Figure 3, the scattering cross sections obtained from the different T-matrix methods agree very well. We can clearly identify three different resonances: a broad electric dipole resonance at 680 THz, and two resonances with magnetic dipole and

Signal enhancement in cantilever magnetometry based on a co-resonantly coupled sensor

• Julia Körner,
• Christopher F. Reiche,
• Thomas Gemming,
• Bernd Büchner,
• Gerald Gerlach and
• Thomas Mühl

Beilstein J. Nanotechnol. 2016, 7, 1033–1043, doi:10.3762/bjnano.7.96

• elongated magnetic dipole oscillating in a magnetic field. Since the magnetization of the iron nanowire is considered to be nearly parallel to the axis of the FeCNT, its two magnetic poles are positioned at either end, i.e., at a distance of Lcnt = 10 μm. Furthermore, a decrease of the field of the NdFeB

Magnetic reversal dynamics of a quantum system on a picosecond timescale

• Nikolay V. Klenov,
• Alexey V. Kuznetsov,
• Igor I. Soloviev,
• Sergey V. Bakurskiy and
• Olga V. Tikhonova

Beilstein J. Nanotechnol. 2015, 6, 1946–1956, doi:10.3762/bjnano.6.199

• the superconducting qubits. Thus, the problem can be solved in the framework of the nonstationary Schroedinger equation (rather than the density matrix formalism): where is the Hamiltonian of the unperturbed magnetic system, is the operator of the X projection of the magnetic dipole moment of the

• previous section for oscillating quasi-resonance and unipolar magnetic pulses and their influence on the atomic and superconducting qubit systems. A dramatic difference between the atomic and superconducting qubits exists in the value of the matrix element of the magnetic dipole moment, which (for allowed

Interaction of electromagnetic radiation in the 20–200 GHz frequency range with arrays of carbon nanotubes with ferromagnetic nanoparticles

• Agylych Atdayev,
• Alexander L. Danilyuk and
• Serghej L. Prischepa

Beilstein J. Nanotechnol. 2015, 6, 1056–1064, doi:10.3762/bjnano.6.106

• and transmission of electromagnetic radiation. Keywords: carbon nanotubes; electromagnetic radiation; ferromagnetic nanoparticles; magnetic dipole; magnetic nanocomposite; resonance circuit; Introduction Magnetic nanocomposites consisting of ferromagnetic nanoparticles embedded into a matrix

• other words, the nanocomposite impedance compensates for the magnetic moment created by the NP in the carbon matrix at a fixed frequency range. When no valley is present in the μ(ω) dependence, the impedance of the magnetic dipole (and consequently, its polarizability) is determined by the permeability

• values of the passive elements of the interfaces (pH and pF). Sudden decreases in the μ(ω) coefficient for different RiLiCi circuits are explained in terms of the interaction of the magnetic dipole formed by the ferromagnetic metallic NPs and the RiLiCi circuits, which leads to the compensation of the

qPlus magnetic force microscopy in frequency-modulation mode with millihertz resolution

• Maximilian Schneiderbauer,
• Daniel Wastl and
• Franz J. Giessibl

Beilstein J. Nanotechnol. 2012, 3, 174–178, doi:10.3762/bjnano.3.18

• gradients of the interactions responsible for atomic contrast and those causing domain contrast are orders of magnitude apart, ranging from up to 100 Nm−1 for atomic interactions down to 0.0001 Nm−1 for magnetic dipole interactions. Here, we show that this gap can be bridged with a qPlus sensor, with a

• stiffness of 1800 Nm−1 (optimized for atomic interaction), which is sensitive enough to measure millihertz frequency contrast caused by magnetic dipole–dipole interactions. Thus we have succeeded in establishing a sensing technique that performs scanning tunneling microscopy, atomic force microscopy and MFM

• with a single probe. Keywords: hard disc; high-stiffness cantilever; magnetic force microscopy; qPlus; Introduction Ferromagnetism is a collective phenomenon showing a parallel alignment of atomic magnetic dipole moments over macroscopic domains caused by a quantum-mechanical exchange interaction

Analysis of fluid flow around a beating artificial cilium

• Mojca Vilfan,
• Gašper Kokot,
• Andrej Vilfan,
• Natan Osterman,
• Blaž Kavčič,
• Igor Poberaj and
• Dušan Babič

Beilstein J. Nanotechnol. 2012, 3, 163–171, doi:10.3762/bjnano.3.16

• arbitrary direction and of varying magnitude. The typical magnetic-field density used in the experiments was between 5 and 7 mT, which is low enough to keep the magnetisation in the superparamagnetic particles well below the saturation value. The induced magnetic dipole moment in the beads was therefore

Nanoscaled alloy formation from self-assembled elemental Co nanoparticles on top of Pt films

• Luyang Han,
• Ulf Wiedwald,
• Johannes Biskupek,
• Kai Fauth,
• Ute Kaiser and
• Paul Ziemann

Beilstein J. Nanotechnol. 2011, 2, 473–485, doi:10.3762/bjnano.2.51

• effective spin magnetic moment µL/µSeff, where the effective spin moment µSeff = µS + 7 µT contains two contributions: The spin moment µS, as well as the magnetic dipole moment µT, which relates to the anisotropy of the spin density distribution. As the magnetic dipole term may be quite significant in CoPt

Magnetic interactions between nanoparticles

• Steen Mørup,
• Mikkel Fougt Hansen and
• Cathrine Frandsen

Beilstein J. Nanotechnol. 2010, 1, 182–190, doi:10.3762/bjnano.1.22

• 10.3762/bjnano.1.22 Abstract We present a short overview of the influence of inter-particle interactions on the properties of magnetic nanoparticles. Strong magnetic dipole interactions between ferromagnetic or ferrimagnetic particles, that would be superparamagnetic if isolated, can result in a

• magnetic dipole interactions can have a strong influence on, e.g., the magnetic dynamics in samples containing ferromagnetic or ferrimagnetic nanoparticles. If nanoparticles or thin films are in close proximity, exchange interactions between surface atoms can be significant. An important example of

• . In this short review, we first discuss how the superparamagnetic relaxation in nanoparticles can be influenced by magnetic dipole interactions and by exchange interactions between particles. Subsequently, we discuss how the spin structure of nanoparticles can be influenced by inter-particle exchange

Magnetic coupling mechanisms in particle/thin film composite systems

• Giovanni A. Badini Confalonieri,
• Philipp Szary,
• Durgamadhab Mishra,
• Maria J. Benitez,
• Mathias Feyen,
• An Hui Lu,
• Leonardo Agudo,
• Gunther Eggeler,
• Oleg Petracic and
• Hartmut Zabel

Beilstein J. Nanotechnol. 2010, 1, 101–107, doi:10.3762/bjnano.1.12

• , indicative of a collective behavior due to magnetic dipole interaction. The composite system shows two blocking temperatures: one above the temperature of the single NP layer, which likely is due to the interaction with the Co-layer, and one below, which we assign to small NP islands that are in contact with