Electromagnon in the Y-type hexaferrite 
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Vít, Jakub; Kadlec, F.; Kadlec, Christelle; Borodavka, Fedir; Chai, Yisheng; Zhai, Kun; Sun, Young; Kamba, S.

doi:10.1103/physrevb.97.134406

Cited by 30 publications

(19 citation statements)

References 38 publications

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“…We assign the observed 41.7 GHz (≈ 0.17 meV) in Fig. 2 to the lower energy magnon 39 by noting that the higher energy magnon in Y-type hexaferrites is usually located in the frequency range of 0.5-1.5 THz 42,43 . Using the fully determined parameters in the Hamiltonian, the relative magnitudes of μL1 and μS1 precessions are calculated (see Methods and Supplementary Fig.…”

Section: An Effective Magnetic Hamiltonian Quantifying the Precessing...mentioning

confidence: 89%

“…We attribute the lower energy AFM magnon (low-lying mode) to the coherent magnon with the frequency of 41.7 ± 0.9 GHz 39 . The higher energy AFM magnon (high-lying mode) is presumed in the frequency range 0.5 -1.5 THz where a number of Y-type hexaferrites exhibit another AFM magnon mode 42,43 . By setting the frequency of this higher energy mode to 0.8 THz, we find DL|μL| With all the parameters determined in the magnetic Hamiltonian, relative magnitudes of the AFM magnon modes are calculated.…”

Section: Fitting Of the Transient Magneticmentioning

confidence: 99%

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4D visualization of the light-induced coherent magnon by an X-ray free electron laser

Jang

Ueda

Kim

et al. 2022

Preprint

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Ultrafast optical manipulation of magnetic phenomena is an exciting achievement of mankind, expanding one’s horizon of knowledge towards functional non-equilibrium states. The dynamics acting on an extremely short timescale push the limit of detection, and ultimately require four-dimensional (4D) views, i.e., 3D space and 1D time to keep sight of the evolving magnetic structure thoroughly. Here we introduce time-resolved resonant magnetic X-ray diffraction with an X-ray free electron laser to accomplish the 4D visualization of a light-induced coherent magnon. The trajectory of antiferromagnetic precession in a Y-type hexaferrite manifests a photoinduced effective magnetic-field that lasts long after the photoirradiation, being attributed to nonthermal inter-site electron transfer among the magnetic ions. With the unprecedented capability of direct quantifying the field for the photoexcitation above the band gap, we find a remarkable amplification of the photomagnetic effect reaching an order of magnitude higher than that below the gap with the same laser fluence. This result illuminates a highly energy-efficient route to achieve substantial photoinduced field in antiferromagnetic dielectrics desired for optospintronics applications. The X-ray methodology established in this work has no restriction on net-magnetization, offering a great capability to uncover ultrafast magnetic phenomena in every class of magnets.

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Section: An Effective Magnetic Hamiltonian Quantifying the Precessing...mentioning

confidence: 89%

Section: Fitting Of the Transient Magneticmentioning

confidence: 99%

4D visualization of the light-induced coherent magnon by an X-ray free electron laser

Jang

Ueda

Kim

et al. 2022

Preprint

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“…To find out whether some magnetic excitation can be at the origin of the discovered THz soft mode, similar to Y-and Z-type hexaferrites 33,34 , we performed THz spectral measurements cm -1 at room temperature to ≈10 cm -1 at 10 K, see Fig. 4d.…”

Section: Thz Spectra the Soft Modementioning

confidence: 99%

Lead-substituted barium hexaferrite for tunable terahertz optoelectronics

Alyabyeva

Prokhorov

Винник

et al. 2021

Preprint

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In recent years, due to their outstanding dielectric and magnetic properties, hexagonal ferrites (hexaferrites) have attracted considerable interest for developing electronic components of next-generation communication systems. The complex crystal structure of hexaferrites and critical dependences of their electric and magnetic properties on external factors, like magnetic or electric fields, pressure or doping, open ample opportunities for targeted tuning of these properties when designing specific devices. To that end, we explored the electromagnetic properties of the Pb-substituted barium hexaferrite, Ba1-xPbxFe12O19, a compound featuring an extremely rich set of physical phenomena that are inherent in the dielectric and magnetic subsystems of the material and are expected to have significant effect on its electromagnetic response at radio and terahertz frequencies. We performed the first detailed measurements of the AC response of single-crystalline Ba1-xPbxFe12O19 in an extremely broad spectral range from 1 Hz to 240 THz down to temperatures as low as 5 K. We fully characterized numerous microscopic phenomena that determine the broad-band dielectric response of the compound, and we analyzed their nature. This includes temperature-activated radiofrequency relaxations that were attributed to the dynamic response of magnetic/dielectric domains. The terahertz response is dominated by a ferroelectric-like soft mode with an unusual temperature behavior that we explain by means of a microscopic model. Several narrower terahertz excitations are associated with electronic transitions between the fine-structure components of the Fe2+ground state. Narrow resonances detected in the gigahertz region are presumably of magneto-electric origin. The obtained data on diverse but controllable electromagnetic properties of Ba1-xPbxFe12O19 compounds provides the researchers with information that makes the entire class of hexaferrites materials attractive for manufacturing electronic devices for the radiofrequency and terahertz ranges, such as absorbing coatings, anti-reflective coatings, absorbers, electromagnetic shields, antennas, phase shifters, filters, resonators, modulators, etc.

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“…Hexaferrite materials (M-type (Ba,Sr)(Fe,Sc,Mg) 12 O 19 , Y-type (Ba,Sr) 2 Me 2 Fe 12 O 22 and Z-type (Ba,Sr) 3 Me 2 Fe 24 O 41 ) exhibit spiral magnetic phases stable over a wide range of temperatures spanning up to the room temperature (RT). This made hexaferrites a hot spot of research activities over the past decade [28][29][30][31][32][33]. These materials are also known for their extensive usage as permanent magnets and their high potential in microwave applications.…”

Section: Introductionmentioning

confidence: 99%

Highly tunable spin Hall magnetoresistance in room-temperature magnetoelectric multiferroic, $\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}|$Pt hybrids

Wagh¹,

Garg²,

Mallick³

et al. 2022

Preprint

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We present spin transport studies on a low-field, room-temperature magnetoelectric multiferroic polycrystalline Sr 3 Co 2 Fe 24 O 41 |Pt heterostructure wherein a highly tunable transverse conical magnetic phase is responsible for static and dynamic magnetoelectric coupling. We measured angular dependence of spin Hall magnetoresistance (SMR) at constant magnetic fields (H) in the range of 50 to 100 kOe. Application of field below the critical value (Hc1 ≈ 2.5 kOe), yielded negative SMR and the H-evolution of normalized SMR ((∆R/R0) × 100%) exhibited a negative gradient. Further, an increase in the H resulted in the positive slope of (∆R/R0) × 100% Vs. H and later at higher H around 14 kOe, a crossover from negative to positive SMR was observed. We employed a simple model for estimating the equilibrium magnetic configuration and computed the SMR modulation at various values of H. We argue that the tilting of the cone is dominant and in turn responsible for the observed nature of SMR below 2.5 kOe while, the closing of the cone-angle is pronounced at higher fields causing a reversal in sign of the SMR from negative to positive. Importantly, SMR experiments revealed that a change in the helicity with a reversal of the magnetic field has no influence on the observed SMR. Longitudinal spin Seebeck effect (LSSE) signal was measured to be ≈ 500 nV at 280 K, under application of thermal gradient, ∆T = 23 K and field, 60 kOe. The observed LSSE signal, originating from pure magnon spin current, showed a similar H-dependent behavior as that of the magnetization of Sr 3 Co 2 Fe 24 O 41 . Our detailed spin transport studies on polycrystalline Sr 3 Co 2 Fe 24 O 41 |Pt heterostructure demonstrate high tunability of the amplitude and the sign of the SMR, highlighting its potential for novel spintronic devices such as SMR-based spin valves and voltage-controlled spin transport devices.I.

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Electromagnon in the Y-type hexaferrite BaSrCoZnFe11AlO22

Cited by 30 publications

References 38 publications

4D visualization of the light-induced coherent magnon by an X-ray free electron laser

4D visualization of the light-induced coherent magnon by an X-ray free electron laser

Lead-substituted barium hexaferrite for tunable terahertz optoelectronics

Highly tunable spin Hall magnetoresistance in room-temperature magnetoelectric multiferroic, $\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}|$Pt hybrids

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