Observation of Magnon Polarization

Nambu, Yusuke; Barker, Joseph; Okino, Yasushi; Kikkawa, Takashi; Shiomi, Yuki; Enderle, M.; Weber, T.; Winn, Barry; Graves-Brook, M.; Tranquada, J. M.; Ziman, Timothy; Fujita, M.; Bauer, G.; Saitoh, Eiji; Kakurai, Kazuhisa

doi:10.1103/physrevlett.125.027201

Cited by 75 publications

(62 citation statements)

References 39 publications

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“…Furthermore, the temperature-dependent frequency shifts of the THz magnon in our RR and LL spectra were identified and compared to the results obtained from neutron scattering measurements [25,28] and simulations [23,24], as shown in Fig. 6(a).…”

Section: Resultsmentioning

confidence: 92%

“…Recent investigations of full magnon band structures have been based on several theoretical methods [20][21][22][23][24]. In experimental studies, the THz magnons in YIG have been identified only using inelastic neutron scattering spectroscopy [25][26][27][28]. Hence, to understand the behaviors of the THz magnons in YIG in further detail, it is necessary to investigate other optical properties such as the selection rule using Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy

et al. 2020

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Backscattering Raman spectroscopic investigations were performed on an yttrium-iron garnet single crystal using linearly and circularly polarized light. A terahertz (THz) magnon of the Kaplan-Kittel (KK) exchange resonance was discovered, which had been regarded as unobservable via optical methods. The KK exchange resonance had a 7.8-THz frequency at 80 K, and the polarization selection rule led to an antisymmetric Raman tensor of the A 2 mode. Moreover, the assignment of all the Raman-active phonon modes, 3A 1g , 8E g , and 14T 2g , was proposed. This study will stimulate further investigation of the coupling of THz magnons and phonons and pave the way toward THz optomagnonics.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy

et al. 2020

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“…Recent works have focused on not only crystal antiferromagnets but also ferrimagnets for spin wave polarization experiments. In the previous studies, rightand left-handed spin wave polarizations were directly observed by inelastic neutron scattering in yttrium iron garnet 17) and switching of spin wave polarization was observed across the compensated temperature by Brillouin light scattering in GdFeCo films 18) . In synthetic antiferromagnets (SAFs), two magnetic moments separated by a thin nonmagnetic spacer are antiferromagnetically coupled via interlayer exchange coupling.…”

Section: Introductionmentioning

confidence: 93%

Spin Wave Resonance in Perpendicularly Magnetized Synthetic Antiferromagnets

et al. 2021

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We report antiferromagnetic spin wave resonance in perpendicularly magnetized synthetic antiferromagnets consisting of Co/Ni multilayers and a thin Ru spacer layer. Two resonance modes were observed in the finite range of the out-of-plane bias magnetic field, where two magnetic moments separated by the Ru layer were antiferromagnetically aligned. These two modes show an opposite dependence on the bias magnetic field and correspond to right-and left-handed polarized spin waves. We also theoretically derive the spin wave dispersion for the perpendicularly magnetized synthetic antiferromagnets on the basis of an equation of motion. Our experimental results show good agreement with the theoretical analysis.

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“…While the traditional area where neutron polarisation option offers unparalleled capability is the analysis of magnetic materials structure and dynamics [100][101][102][103], the application of this technique to the study of disordered non-magnetic systems remains largely unexploited. Indeed, if magnetic order is present, e.g.…”

Section: Polarisation Analysis In Non-magnetic Systemsmentioning

confidence: 99%

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

Petrillo

Sacchetti

2021

Advances in Physics: X

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The European landscape of neutron sources for research applications is changing and the major European joint effort, the European Spallation Source (ESS) currently under construction in Lund (Sweden), is progressing. The high flux source ESS is designed to deliver slow neutrons with a longpulse time structure, a rather unique feature, with characteristics optimised to maximise the instrument performances and the experimental throughput. This is expected to result in unprecedented scientific capability over broad research areas. Major breakthroughs are likely to take place in the understanding of complex, strongly interacting and disordered systems, more specifically on their dynamical response. This will have an impact on the development of novel theories to cover some of the presently existing knowledge gaps and will prompt advanced applications of the investigated materials. Liquid metals are a prototypical example of complex systems extensively studied from the sixties on, now re-emerging as powerful functional materials for unconventional and broad spectrum applications. Research on liquid metal composites will benefit of the new experimental possibilities available at the ESS. We review the status of the experiments on liquid metals dynamics, focusing on a selected set of systems, and discuss the perspectives for cutting-edge experiments at the new sources.

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Observation of Magnon Polarization

Cited by 75 publications

References 39 publications

Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy

Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy

Spin Wave Resonance in Perpendicularly Magnetized Synthetic Antiferromagnets

Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals

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