Optical excitation of spin waves in epitaxial iron garnet films: MSSW vs BVMSW

Chernov, A. I.; Kozhaev, M. A.; Savochkin, I. V.; Dodonov, D. V.; Vetoshko, P. M.; Zvezdin, A. K.; Belotelov, V. I.

doi:10.1364/ol.42.000279

Cited by 29 publications

(18 citation statements)

References 35 publications

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“…It corresponds to the other type of spin waves, namely magnetostatic surface spin waves (MSSW). The efficiency of MSSW excitation by laser pulses increases for smaller beam diameters 36 . In the current studies the pump beam diameter was kept the same for all microdisks.…”

Section: ) Blue Dots)mentioning

confidence: 99%

Accumulation and Control of Spin Waves in Magnonic Dielectric Microresonators by a Comb of Ultrashort Laser Pulses

Kobecki

et al. 2021

Preprint

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Spin waves in magnetic microresonators are at the core of modern magnonics. Here we demonstrate a new method of tunable excitation of different spin wave modes in magnetic microdisks by using a train of laser pulses coming at a repetition rate higher than the decay rate of spin precession. The microdisks are etched in a transparent bismuth iron garnet film and the light pulses influence the spins nonthermally through the inverse Faraday effect. The high repetition rate of the laser stimulus of 10 GHz establishes an interplay between the spin wave resonances in the frequency and momentum domains. As a result, the excitation efficiency of different spin modes can be tuned by a small variation of the external magnetic field. An additional degree of freedom is provided by scanning the laser spot within the microdisk area. This makes the proposed method for spin wave excitation advantageous for the forthcoming application of magnonics for telecommunication and quantum technologies.

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Section: ) Blue Dots)mentioning

confidence: 99%

Accumulation and Control of Spin Waves in Magnonic Dielectric Microresonators by a Comb of Ultrashort Laser Pulses

Kobecki

et al. 2021

Preprint

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“…On the other hand, MSWs are characterized by very low group velocity. These unique and interesting properties of MSWs provide a promising way for realizing various applications, such as optical communication [7,8], signal processing [8,9] and MSWs based delay line [10]. The one-way MSWs with natural low group velocity can also be used to achieve trapping rainbow.…”

Section: Introductionmentioning

confidence: 99%

Trapping a magnetic rainbow by using a one-way magnetostatic-like mode

Shen

Min

et al. 2019

Opt. Mater. Express

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Trapped rainbow effects have been realized in many systems while they are all characterized by electric-field enhancement. The trapped rainbow with strong magnetic-field enhancement has yet to be studied. Here, we achieve the trapped magnetic rainbow effect in a novel metal-air-YIG (yttrium-iron-garnet)-metal (MAYM) waveguide applied with a continuously decreasing magnetic field. The proposed system supports a one-way propagation feature, leading to the suppressed reflection. We systemically analyze the dispersion and the modal properties, showing the transition from the SMP (surface magnetoplasmon)-like mode to magnetostatic-like mode and the change of the group velocity when decreasing the external magnetic field along the propagation direction of the wave. We obtain the trapped magnetic rainbow effects as well as magnetic hotspots both in frequency-and time-domain simulations. The trapped rainbow effect with strong magnetic field enhancement paves a promising way for many applications including magnetic sensing to magnetic non-linearity.

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“…Moreover, the authors of Ref. 23 managed to optically excite magnetostatic spin waves in iron garnets and later their tunability by beam diameter was demonstrated [27,28].…”

Section: Introductionmentioning

confidence: 99%

Optically pumped Floquet states of magnetization in ferromagnets

2019

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Floquet states have been subject of great research interest since Zel'dovich's pioneering work on the quasienergy of a quantum system subject to a temporally periodic action. Nowadays periodic modulation of the system Hamiltonian is mostly achieved by microwaves leading to novel exciting phenomena in condensed matter physics: Floquet topological insulators, chiral edge states etc. On the other hand, nonthermal optical control of magnetization at picosecond time scales is currently a highly appealing research topic for potential applications in magnetic data storage. Here we combine these two concepts to investigate Floquet states in the system of exchange-coupled spins in a ferromagnet. We periodically perturb the magnetization of an iron-garnet film by a train of circularly-polarized femtosecond laser pulses hitting the sample at 1 GHz repetition rate and monitor the magnetization dynamics behaving like a Floquet state. An external magnetic field allows tuning of the Floquet states leading to a pronounced increase of the precession amplitude by one order of magnitude at the center of the Brillouin zone, i.e. when the precession frequency is a multiple of the laser pulse repetition rate. Floquet states might potentially allow for parametric generation of magnetic oscillations. The observed phenomena expand the capabilities of coherent ultrafast optical control of magnetization and pave a way for their application in quantum computation or data processing.

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Optical excitation of spin waves in epitaxial iron garnet films: MSSW vs BVMSW

Cited by 29 publications

References 35 publications

Accumulation and Control of Spin Waves in Magnonic Dielectric Microresonators by a Comb of Ultrashort Laser Pulses

Accumulation and Control of Spin Waves in Magnonic Dielectric Microresonators by a Comb of Ultrashort Laser Pulses

Trapping a magnetic rainbow by using a one-way magnetostatic-like mode

Optically pumped Floquet states of magnetization in ferromagnets

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