Evidence for spin current driven Bose-Einstein condensation of magnons

Divinskiy, B.; Merbouche, Hugo; Demidov, V. E.; Nikolaev, K. O.; Soumah, Lucile; Gouéré, D.; Lebrun, Romain; Cros, Vincent; Youssef, J. Ben; Bortolotti, Paolo; Anane, A.; Demokritov, S. O.

doi:10.1038/s41467-021-26790-y

Cited by 32 publications

(15 citation statements)

References 44 publications

(45 reference statements)

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“…The so-called spin-caloritronic nano-oscillator [281], in which thermal magnons are injected into a magnetic insulator via the spin Seebeck effect, may be interpreted as quasi-equilibrium magnon BEC [282]. Very recently, magnon BEC by electric spin injection was reported [283]. Finally, we remark that in quasi-equilibrium magnon BEC the condensate is dynamic and leads to time-dependent magnetization dynamics, for example the nanooscillator mentioned above.…”

Section: Quasi-equilibrium Magnon Bose-einstein Condensationmentioning

confidence: 68%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

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Spintronics and quantum information science are two promising candidates for innovating information processing technologies. The combination of these two fields enables us to build solid-state platforms for studying quantum phenomena and for realizing multi-functional quantum tasks. For a long time, however, the intersection of these two fields was limited due to the distinct properties of the classical magnetization, that is manipulated in spintronics, and quantum bits, that are utilized in quantum information science. This situation has changed significantly over the last few years because of the remarkable progress in coding and processing information using magnons. On the other hand, significant advances in understanding the entanglement of quasi-particles and in designing high-quality qubits and photonic cavities for quantum information processing provide physical platforms to integrate magnons with quantum systems. From these endeavours, the highly interdisciplinary field of quantum magnonics emerges, which combines spintronics, quantum optics and quantum information science. Here, we give an overview of the recent developments concerning the quantum states of magnons and their hybridization with mature quantum platforms. First, we review the basic concepts of magnons and quantum entanglement and discuss the generation and manipulation of quantum states of magnons, such as single-magnon states, squeezed states and quantum many-body states including Bose-Einstein condensation and the resulting spin superfluidity. We discuss how magnonic systems can be integrated and entangled with quantum platforms including cavity photons, superconducting qubits, nitrogen-vacancy centers, and phonons for coherent information transfer and collaborative information processing. The implications of these hybrid quantum systems for non-Hermitian physics and parity-time symmetry are highlighted, together with applications in quantum memories and high-precision measurements. Finally, we present an outlook on some of the challenges and opportunities in quantum magnonics.

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Section: Quasi-equilibrium Magnon Bose-einstein Condensationmentioning

confidence: 68%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

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“…Moreover, the observed out-of-plane anisotropy in maghemite is of interest for energy efficient data storage devices based on magnetic textures such as magnetic bubbles, chiral domain walls, and magnetic skyrmions [60]. Finally, the strain-induced reduced effective magnetization of maghemite renders it a promising material platform for future magnonics applications of magnetically ordered insulators [1,[20][21][22].…”

Section: Discussionmentioning

confidence: 99%

“…In detail, we find a small negative effective magnetization M eff , suggesting the presence of a strain-induced perpendicular magnetic anisotropy in our samples. This makes γ-Fe 2 O 3 particularly desirable for all-electrical magnon transport experiments [1,[20][21][22] as it lowers non-viscous contributions to damping and thereby increases the effective magnon conductivity. For the temperature dependence of the effective magnetization, M eff (T ), we observe a sign change on reducing temperature.…”

Section: Introductionmentioning

confidence: 99%

Reduced effective magnetization and damping by slowly-relaxing impurities in strained $γ$-$\mathrm{Fe_2O_3}$ thin films

Müller¹,

Scheufele²,

Gückelhorn³

et al. 2022

Preprint

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“…The latter feature enables concepts for magnetic random access memories. Recently, STT was utilized to create BEC in thin-film BiYIG [29].…”

Section: Introductionmentioning

confidence: 99%

Spin-transfer-assisted parametric pumping of magnons in yttrium iron garnet

Frostad¹,

Skarsvåg²,

Brataas³

2022

Preprint

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The combination of parametric pumping and spin-transfer torque is a powerful approach that enables high-level control over magnetic excitations in thin-film ferromagnets. The excitation parameters, such as pumping power and external field strength, affect the instabilities of individual magnon modes. We theoretically explore how the simultaneous effects of parametric pumping and spin transfer torque influence these magnetic instabilities in a thin-film ferromagnet. Within the LLG framework, we perform micromagnetic simulations of magnon excitations in yttrium iron garnet by pumping, spin transfer torque, and a combining the two. Consistent with experimental results, we find that the magnitude and direction of the spin transfer torque tune the parametric instability thresholds.

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Evidence for spin current driven Bose-Einstein condensation of magnons

Cited by 32 publications

References 44 publications

Quantum magnonics: when magnon spintronics meets quantum information science

Quantum magnonics: when magnon spintronics meets quantum information science

Reduced effective magnetization and damping by slowly-relaxing impurities in strained $γ$-$\mathrm{Fe_2O_3}$ thin films

Spin-transfer-assisted parametric pumping of magnons in yttrium iron garnet

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