Microwave Spectroscopy of the Low-Temperature Skyrmion State in 
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Aqeel, Aisha; Sahliger, Jan; Taniguchi, Tomoyo; Mändl, Stefan; Mettus, Denis; Berger, H.; Bauer, Andreas; Garst, Markus; Pfleiderer, C.; Back, Christian

doi:10.1103/physrevlett.126.017202

Cited by 38 publications

(46 citation statements)

References 40 publications

(61 reference statements)

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“…The calculations were performed for figure 7(b) K = 0.0002, C = 0 and figure 7(c) K = 0.0002, C = 0.2, respectively, illustrating the significant impact on the hybridization process. These results suggest that further anisotropy terms [20,21], like the one discussed above, might play a non-negligible role and need to be considered for a comprehensive analysis of the temperature dependence of the hybridization.…”

Section: Resultsmentioning

confidence: 99%

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Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Lee

Sahliger

Aqeel

et al. 2021

J. Phys.: Condens. Matter

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Recently, it has been shown that the chiral magnetic insulator Cu2OSeO3 hosts skyrmions in two separated pockets in temperature and magnetic field phase space. It has also been shown that the predominant stabilization mechanism for the low-temperature skyrmions (LTS) phase is the crystalline anisotropy in contrast to temperature fluctuations, which stabilize the well established high-temperature skyrmion (HTS) lattice. Here, we report on the gigahertz dynamics in the LTS phase in Cu2OSeO3. The LTS phase is populated via a field cycling protocol with the static magnetic field applied parallel to the h100i crystalline direction of plate and cuboid-shaped bulk crystals. By analyzing temperature-dependent broadband spectroscopy data, clear evidence of low-temperature skyrmion excitations with clockwise (CW), counterclockwise (CCW), and breathing mode (BR) character at temperatures below T = 40 K are shown. We find that the modes’ intensities can be tuned with the number of field-cycles below the saturation field, and by tracking the resonance frequencies, the LTS phase diagram can be established. From our experiments, we conclude that the LTS phase is well separated from the high-temperature phase. Furthermore, by monitoring the strength of the observed hybridization between a dark CW mode and the BR as a function of temperature for the two differently shaped crystals, we unambiguously conclude that the magnetocrystalline anisotropy governs the hybridization.

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Section: Resultsmentioning

confidence: 99%

“…In order to support these results theoretically, we employ the previously established phenomenological model for chiral magnets, which can be found in various publications [11,14,21]. The theoretical approach is based on the Ginzburg-Landau energy density, which consists of the following contributions:…”

Section: Resultsmentioning

confidence: 99%

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Lee

Sahliger

Aqeel

et al. 2021

J. Phys.: Condens. Matter

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“…prepared 88,159,160 . More interestingly, topological magnons, chiral magnonic edge state, as well as hybrid and quantum magnonic phenomena were predicted in SMCs in recent works [92][93][94][95][96][97][98]103,106 . According to the spatial dimension of the periodical skyrmion arrangement, SMCs can be classified into two types: 1D-SMCs [88][89][90][91] and 2D-SMCs 92-99 .…”

Section: What Are Skyrmion Based Magnonic Crystals?mentioning

confidence: 99%

“…However, most of the research on hybrid phenomena of magnons are based on uniform magnetic media. Only a few works concerned the role of SMCs in these phenomena very recently 103,105 . As mentioned in Section 4-4, A. Aqeel et al firstly reported an investigation on the hybrid of magnon modes in the low temperature skyrmion lattice state of Cu2OSeO3 in 2021 103 .…”

Section: -2 Hybrid and Quantum Phenomena Of Magnonsmentioning

confidence: 99%

“…Thus, the concept of magnonic crystals (MCs) was put forward 61,69,70,[85][86][87] , in which spin waves (or magnons) can be modulated into magnon bands via artificial periodical structures of magnetic properties. In such a new kind of magnetic media, skyrmion based MCs (SMCs) have attracted much attention due to their dynamically tunability, topological nontrivial characteristics, as well as hybrid and quantum phenomena [88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106] . In this review, we will firstly introduce the concepts of MCs and magnetic skyrmion.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid quantum systems based on magnonics

Lachance-Quirion

Tabuchi

Gloppe

et al. 2019

Appl. Phys. Express

591

413

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Engineered quantum systems enabling novel capabilities for communication, computation, and sensing have blossomed in the last decade. Architectures benefiting from combining distinct and complementary physical quantum systems have emerged as promising platforms for developing quantum technologies. A new class of hybrid quantum systems based on collective spin excitations in ferromagnetic materials has led to the diverse set of experimental platforms which are outlined in this review article. The coherent interaction between microwave cavity modes and collective spin-wave modes is presented as the backbone of the development of more complex hybrid quantum systems. Indeed, quanta of excitation of the spin-wave modes, called magnons, can also interact coherently with optical photons, phonons, and superconducting qubits in the fields of cavity optomagnonics, cavity magnomechanics, and quantum magnonics, respectively. Notably, quantum magnonics provides a promising platform for performing quantum optics experiments in magnetically-ordered solid-state systems. Applications of hybrid quantum systems based on magnonics for quantum information processing and quantum sensing are also outlined briefly.

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Growth and Helicity of Noncentrosymmetric Cu₂OSeO₃ Crystals

Aqeel

Sahliger

et al. 2021

Physica Status Solidi (b)

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Cu2OSeO3 single crystals are grown with an optimized chemical vapor transport technique using SeCl4 as a transport agent (TA). The optimized growth method allows to selectively produce large high‐quality single crystals. The method is shown to consistently produce Cu2OSeO3 crystals of maximum size 8 × 7 × 4 mm with a transport duration of around three weeks. It is found that this method, with SeCl4 as TA, is more efficient and simple compared with the commonly used growth techniques reported in literature with HCl gas as TA. The Cu2OSeO3 crystals have very high quality and their absolute structures are fully determined by simple single‐crystal X‐ray diffraction. Enantiomeric crystals with either left‐ or right‐handed chiralities are observed. The magnetization and ferromagnetic resonance data show the same magnetic phase diagram as reported earlier.

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Microwave Spectroscopy of the Low-Temperature Skyrmion State in Cu2OSeO3

Cited by 38 publications

References 40 publications

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Hybrid quantum systems based on magnonics

Growth and Helicity of Noncentrosymmetric Cu₂OSeO₃ Crystals

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Microwave Spectroscopy of the Low-Temperature Skyrmion State in Cu2OSeO3

Cited by 38 publications

References 40 publications

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Hybrid quantum systems based on magnonics

Growth and Helicity of Noncentrosymmetric Cu2OSeO3 Crystals

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Product

Resources

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Growth and Helicity of Noncentrosymmetric Cu₂OSeO₃ Crystals