Terahertz-optical properties of a bismuth ferrite single crystal

Białek, M.; T, Ito; Rønnow, H. M.; Ansermet, Jean-Philippe

doi:10.1103/physrevb.99.064429

Cited by 19 publications

(14 citation statements)

References 48 publications

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“…, where the factor p = 0.64 is a volume fraction of material to air in our pelletized samples. 43 This value is the maximum density of random-packed hard spheres. 48 This assumption allows us to obtain values of c and µ c that are comparable with literature values for single crystal samples.…”

Section: Arxiv:190309590v2 [Cond-matmes-hall] 12 Dec 2019mentioning

confidence: 99%

“…where g s = 2, ρ is density of resonators and p = 0.64 is the mass filling factor of our polycrystalline sample. 43,48 Equation 8 assumes that a magnon is coupled to a single electromagnetic cavity mode with a coupling strength 53…”

Section: Arxiv:190309590v2 [Cond-matmes-hall] 12 Dec 2019mentioning

confidence: 99%

“…We used polycrystaline samples for their isotropic properties, as large anisotropic properties in crystals might hinder the coupling. 43 We have created disk-shaped samples of 1.0 and 0.6 mm thicknesses, thus having different cavity-mode spectra. A sample was placed in a furnace, which allowed to control temperature up to 700 K. By using quasioptical methods, we measured transmission with our continuous-wave THz spectrometer based on frequency extenders to a vector network analyzer (VNA).…”

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confidence: 99%

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Spin-wave coupling to electromagnetic cavity fields in dysposium ferrite

2020

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Coupling of spin-waves with electromagnetic cavity field is demonstrated in an antiferromagnet, dysprosium ferrite (DyFeO3). By measuring transmission at 0.2-0.35 THz and sweeping sample temperature, magnon-photon coupling signatures were found at crossings of spin-wave resonances with Fabry-Pérot cavity modes formed in samples. The obtained spectra are explained in terms of classical electrodynamics and a microscopic model. PACS numbers: 71.36.+c, 76.50.+g, 75.50.Ee Coupling of matter and electromagnetic radiation 1 is a topic of great interest in solid state physics research because of their hybrid quantum nature. 2 In the THz range, phonon-polaritons are a well-know example of a light-matter coupling. Recently, polaritons in the THz region were shown with intersubband transitions, 3,4 cyclotron resonance 5 and plasmons 6 in two-dimensional electron gases, as well as with intermolecular transitions in organic materials. 7 In these systems, a strong-coupling regime can be achieved when losses are smaller than the exchange rate between light and matter, 8 giving rise to the vacuum Rabi splitting. Polaritons are composite particles, which are studied in basic research on quantum optics, 2 and can be considered for use in quantum computing and quantum memories. 9-13 The coupling of electromagnetic cavity-modes to magnons was researched intensively in ferromagnets at GHz frequencies, 12,14,15 meeting with expectations of energy-efficient spintronic devices. 16 Coupling of magnons with superconducting qubits was also investigated. 17,18 The Purcell enhancement and the vacuum Rabi splitting were demonstrated in ferromagnetic materials. [19][20][21][22]

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Section: Arxiv:190309590v2 [Cond-matmes-hall] 12 Dec 2019mentioning

confidence: 99%

Section: Arxiv:190309590v2 [Cond-matmes-hall] 12 Dec 2019mentioning

confidence: 99%

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confidence: 99%

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Spin-wave coupling to electromagnetic cavity fields in dysposium ferrite

2020

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“…The q vectors of the cycloids point to one of the three 110 directions in the plane normal to P, resulting in three magnetic domain states within a ferroelectric domain. The strength of the Heisenberg exchange, the DM interactions and the magnetic anisotropies were determined by a combination of spectroscopic studies such as inelastic neutron [15,16] and light scattering experiments [17], THz absorption spectroscopy [18][19][20][21] as well as linear spin-wave theory [22,23] and ab initio calculations [24][25][26][27] .…”

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confidence: 99%

Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO3

et al. 2021

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We report the magnetic-field dependence of the THz absorption and nonreciprocal directional dichroism spectra of BiFeO 3 measured on the three principal crystal cuts for fields applied along the three principal directions of each cut. From the systematic study of the light polarization dependence, we deduced the optical selection rules of the spin-wave excitations. Our THz data, combined with small-angle neutron scattering results showed that (i) an in-plane magnetic field rotates the q vectors of the cycloids perpendicular to the magnetic field and (ii) the selection rules are mostly determined by the orientation of the q vector with respect to the electromagnetic fields. We observed a magnetic field history-dependent change in the strength and the frequency of the spin-wave modes, which we attributed to the change of the orientation and the length of the cycloidal q vector, respectively. Finally, we compared our experimental data with the results of linear spin-wave theory that reproduces the magnetic-field dependence of the spin-wave frequencies and most of the selection rules, from which we identified the spin-polarization coupling terms relevant for the optical magnetoelectric effect.

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“…Помимо создания дважды отрицательных сред на основе ФМ, работающих в микроволновом диапазоне, были предприняты попытки создать аналогичные среды и функциональные устройства для терагерцевого диапазона [1,[11][12][13]. Так, в [14] было проведено численное моделирование показателя преломления метаматериала, выполненного на основе ферритовых пленок LuBiIG и серебряных полосок, который имел отрицательные значения на частотах выше 100 GHz.…”

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Дважды Отрицательные Среды На Основе Антиферромагнитных Метаматериалов Для Терагерцевого Диапазона Частот

Гришин¹,

Амельченко²,

Шараевский³

et al. 2021

Письма В Журнал Технической Физики

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The paper presents the theoretical study results of the dispersion characteristics of electromagnet-ic waves existing in antiferromagnetic (AFM) metamaterial. The AFM metamaterial consists of a transversely magnetized antiferromagnet, inside of which a two-dimensional periodic structure of thin conducting wires surrounded by insulators is placed. It has been established that the AFM metamaterial has two frequency ranges, in which there are backward waves, and the material pa-rameters of the medium are twice negative. The indicated areas are located in the terahertz range.

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Terahertz-optical properties of a bismuth ferrite single crystal

Cited by 19 publications

References 48 publications

Spin-wave coupling to electromagnetic cavity fields in dysposium ferrite

Spin-wave coupling to electromagnetic cavity fields in dysposium ferrite

Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO3

Дважды Отрицательные Среды На Основе Антиферромагнитных Метаматериалов Для Терагерцевого Диапазона Частот

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