Spin and lattice excitations of a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>thin film and ceramics

Skiadopoulou, Stella; Goian, Veronica; Kadlec, Christelle; Kadlec, F.; Bai, Xiaofei; Infante, I. C.; Dkhil, Brahim; Adamo, Carolina; Schlom, D. G.; Kamba, S.

doi:10.1103/physrevb.91.174108

Cited by 30 publications

(35 citation statements)

References 52 publications

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“…Following scientific interest in BFO, these excitations have been probed with a manifold of techniques, e.g., Raman and IR spectroscopy, time-domain terahertz spectroscopy, and neutron scattering. 6 Among these methods, IR spectroscopy may be considered one of the most direct methods to probe IR active phonon modes. It has been applied to ceramic BFO samples, [6][7][8][9] bulk single crystals, 10,11 and thin film samples at cryogenic temperatures.…”

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confidence: 99%

“…6 Among these methods, IR spectroscopy may be considered one of the most direct methods to probe IR active phonon modes. It has been applied to ceramic BFO samples, [6][7][8][9] bulk single crystals, 10,11 and thin film samples at cryogenic temperatures. 6 However, the phonon information obtainable via standard IR spectroscopy suffers from severe drawbacks: ceramic samples generally show lower crystal quality than bulk samples and yield averaged phonon properties because of their polycrystalline nature.…”

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confidence: 99%

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Phonon-induced near-field resonances in multiferroic BiFeO3 thin films at infrared and THz wavelengths

Wehmeier

Nörenberg

Oliveira

et al. 2020

Applied Physics Letters

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Multiferroic BiFeO 3 (BFO) shows several phonon modes at infrared (IR) to THz energies, which are expected to carry information on any sample property coupled to crystal lattice vibrations. While macroscopic IR studies of BFO are often limited by single-crystal size, scatteringtype scanning near-field optical microscopy (s-SNOM) allows for IR thin film spectroscopy of nanoscopic probing volumes with negligible direct substrate contribution to the optical signal. In fact, polaritons such as phonon polaritons of BFO introduce a resonant tip-sample coupling in s-SNOM, leading to both stronger signals and enhanced sensitivity to local material properties. Here, we explore the near-field response of BFO thin films at three consecutive resonances (centered around 5 THz, 13 THz, and 16 THz), by combining s-SNOM with a free-electron laser. We study the dependence of these near-field resonances on both the wavelength and tip-sample distance. Enabled by the broad spectral range of the measurement, we probe phonon modes connected to the predominant motion of either the bismuth or oxygen ions. Therefore, we propose s-SNOM at multiple near-field resonances as a versatile and very sensitive tool for the simultaneous investigation of various sample properties.

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Phonon-induced near-field resonances in multiferroic BiFeO3 thin films at infrared and THz wavelengths

Wehmeier

Nörenberg

Oliveira

et al. 2020

Applied Physics Letters

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“…In the cycloidal spin state of BiFeO 3 [27], several lowfrequency collective modes have been observed by light absorption [28][29][30] and Raman spectroscopy [7,14,31]. Though the electric-field-induced shift of the resonance frequencies observed in the Raman study indicates the ME nature of these magnon modes [14], the optical ME effect has not been investigated in BiFeO 3 .…”

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Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature MultiferroicBiFeO3

Kézsmárki¹,

Nagel²,

Bordács³

et al. 2015

Phys. Rev. Lett.

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Multiferroics permit the magnetic control of the electric polarization and the electric control of the magnetization. These static magnetoelectric (ME) effects are of enormous interest: The ability to read and write a magnetic state current-free by an electric voltage would provide a huge technological advantage. Dynamic or optical ME effects are equally interesting, because they give rise to unidirectional light propagation as recently observed in low-temperature multiferroics. This phenomenon, if realized at room temperature, would allow the development of optical diodes which transmit unpolarized light in one, but not in the opposite, direction. Here, we report strong unidirectional transmission in the room-temperature multiferroic BiFeO 3 over the gigahertz-terahertz frequency range. The supporting theory attributes the observed unidirectional transmission to the spin-current-driven dynamic ME effect. These findings are an important step toward the realization of optical diodes, supplemented by the ability to switch the transmission direction with a magnetic or electric field. DOI: 10.1103/PhysRevLett.115.127203 PACS numbers: 75.85.+t, 75.50.-y, 76.50.+g BiFeO 3 is by far the most studied compound in the populous family of multiferroic and magnetoelectric (ME) materials [1][2][3][4][5][6][7][8][9]. While experimental studies have already reported about the first realizations of the ME memory function using BiFeO 3 -based devices [6][7][8][9], the origin of the ME effect is still under debate due to the complexity of the material. Because of the low symmetry of iron sites and iron-iron bonds, the magnetic ordering can induce local polarization via each of the three canonical terms [10]-the spin-current, exchange-striction, and single-ion mechanisms. While the spin-current term has been identified as the leading contribution to the magnetically induced ferroelectric polarization in various studies [5,11,12], the spin-driven atomic displacements [13] and the electrically induced shift of the spin-wave (magnon) resonances [14] were interpreted based on the exchange-striction and single-ion mechanisms, respectively.In the magnetically ordered phase below T N ¼ 640 K, BiFeO 3 possesses an exceptionally large spin-driven polarization [13], if not the largest among all known multiferroic materials. Nevertheless, its systematic study has long been hindered by the huge lattice ferroelectric polarization (P 0 ) developing along one of the cubic h111i directions at T C ¼ 1100 K and by the lack of single-domain ferroelectric crystals. Owing to the coupling between P 0 and the spindriven polarization, in zero magnetic field they both point along the same [111] axis. A recent systematic study of the static ME effect revealed additional spin-driven polarization orthogonal to the [111] axis [12].The optical ME effect of the magnon modes in multiferroics, which gives rise to the unidirectional transmission in the gigahertz-terahertz frequency range, has recently become a hot topic in materials science [15][16][17][18][19]...

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“…Magnon modes in BiFeO 3 were under investigation in recent years using either inelastic neutron scattering [11,14,22,23], Raman scattering spectroscopy [7,13,[24][25][26], THz time-domain spectroscopy [27], or far-infrared Fourier spectroscopy [28,29]. Most of these studies focused on phenomena at low temperatures, even though BFO shows multiferroic behavior up to almost 400 • C. Our experimental system provides us with stability, high dynamic range, and high spectral resolution, which allows us to characterize these spin-wave resonances at high temperatures.…”

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confidence: 99%

Spin-wave resonances in bismuth orthoferrite at high temperatures

et al. 2018

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Spin-wave resonances in pelletized powder of bismuth orthoferrite (BiFeO 3) were studied in transmission spectroscopy at frequencies of 0.1-0.75 THz and in the temperature range of 300-650 K. A vector network analyzer with frequency extenders was used in conjunction with temperature scans. We extended the experimental coverage of spin-wave resonances in BiFeO 3 up to almost the Néel temperature. We observed that (1) 1 and (2) 1 modes are degenerate around 420 K due to the temperature dependences of the magnetic anisotropy and the Dzyaloshinskii-Moriya interaction.

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Spin and lattice excitations of aBiFeO3thin film and ceramics

Cited by 30 publications

References 52 publications

Phonon-induced near-field resonances in multiferroic BiFeO3 thin films at infrared and THz wavelengths

Phonon-induced near-field resonances in multiferroic BiFeO3 thin films at infrared and THz wavelengths

Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature MultiferroicBiFeO3

Spin-wave resonances in bismuth orthoferrite at high temperatures

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