Stimulated Amplification of Propagating Spin Waves

Breitbach, D.; Schneider, M.; Heinz, B.; Kohl, F.; Maskill, J.; Scheuer, L.; Serha, R. O.; Brächer, T.; Lägel, B.; Dubs, C.; Tiberkevich, V. S.; Slavin, A. N.; Serga, A. A.; Hillebrands, B.; Chumak, A. V.; Pirro, P.

doi:10.1103/physrevlett.131.156701

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…In addition, novel approaches to amplify magnons can be developed, e.g. the use of nonequilibrium magnons to realize the stimulated amplification of SWs [57] or the synchronisation of spintronic auto-oscillators to incoming spin-wave signals.…”

Section: Advances In Science and Technology To Meet Challengesmentioning

confidence: 99%

The 2024 magnonics roadmap

Flebus,

Grundler,

Rana

et al. 2024

J. Phys.: Condens. Matter

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Magnonics is a research field that has gained an increasing interest in both the fundamental and applied sciences in recent years. This field aims to explore and functionalize collective spin excitations in magnetically ordered materials for modern information technologies, sensing applications, and advanced computational schemes. Spin waves, also known as magnons, carry spin angular momenta that allow for the transmission, storage, and processing of information without moving charges. In integrated circuits, magnons enable on-chip data processing at ultrahigh frequencies without the Joule heating, which currently limits clock frequencies in conventional data processors to a few GHz. Recent developments in the field indicate that functional magnonic building blocks for in-memory computation, neural networks, and Ising machines are within reach. At the same time, the miniaturization of magnonic circuits advances continuously as the synergy of materials science, electrical engineering, and nanotechnology allows for novel on-chip excitation and detection schemes. Such circuits can already enable magnon wavelengths of 50 nm at microwave frequencies in a 5G frequency band. Research into non-charge-based technologies is urgently needed in view of the rapid growth of machine learning and artificial intelligence applications, which consume substantial energy when implemented on conventional data processing units. In its first part, the 2024 Magnonics Roadmap provides an update on the recent developments and achievements in the field of nano-magnonics while defining its future avenues and challenges. In its second part, the Roadmap addresses the rapidly growing research endeavors on hybrid structures and magnonics-enabled quantum engineering. We anticipate that these directions will continue to attract researchers to the field and, in addition to showcasing intriguing science, will enable unprecedented functionalities that enhance the efficiency of alternative information technologies and computational schemes.

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Section: Advances In Science and Technology To Meet Challengesmentioning

confidence: 99%

The 2024 magnonics roadmap

Flebus,

Grundler,

Rana

et al. 2024

J. Phys.: Condens. Matter

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show abstract

“…Various emerging applications, including reconfigurable spin-wave logic circuits [10,11], unconventional computing [12], and Ising machines [13], rely on these advances. Multiple novel mechanisms have been explored to generate and amplify PSWs [14,15], such as current induced spin-transfer torque (STT) [16][17][18] and spin-orbit torque (SOT) [19][20][21][22][23]. Nano-constriction spin Hall nano-oscillators (SHNOs) with perpendicular magnetic anisotropy (PMA) [24,25] are a particularly promising approach, as they are easy to fabricate [26,27], CMOS compatible [28], strongly voltage tunable [29][30][31][32], and known for their superior mutual synchronization at various length scales and dimensions [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Spin wave-driven variable-phase mutual synchronization in spin Hall nano-oscillators

Kumar,

Chaurasiya,

González

et al. 2024

Preprint

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Spin-orbit torque can drive auto-oscillations of propagating spin wave (PSW) modes in nano-constriction spin Hall nano-oscillators (SHNOs). These modes allow both long-range coupling and the potential of controlling its phase—critical aspect for nano-magnonics, spin wave logic, and Ising machines. Here, we demonstrate PSW-driven variable-phase coupling between two nano-constriction SHNOs and study how their separation and the PSW wave vector impact their mutual synchronization. In addition to ordinary in-phase mutual synchronization, we observe, using both electrical measurements and phase-resolved μ-Brillouin Light Scattering microscopy, mutual synchronization with a phase that can be tuned from 0 to π using the drive current or the applied field. Micromagnetic simulations corroborate the experiments and visualize how the PSW patterns in the bridge connecting the two nano-constrictions govern the coupling. These results advance the capabilities of mutually synchronized SHNOs and open up new possibilities for applications in spin wave logic, unconventional computing, and Ising Machines.

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“…Nonlinear systems have drawn significant attention in recent years due to their importance in fields such as deep learning and artificial neural networks, where nonlinearity is essential for model training [1][2][3][4]. Recently magnetic systems have been proposed as a promising platform for implementing neural networks and nanometric spin-based logic devices considering their low energy consumption and nonlinear behavior [5][6][7][8][9][10][11]. When microwave signals excite magnetic materials with high intensity, a diverse range of nonlinear processes can take place.…”

Section: Introductionmentioning

confidence: 99%

Emergent nonlinear modes in coherent magnon circuits detected at ultrahigh frequency resolution

Grundler,

An,

et al. 2023

Preprint

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Nonlinearity of dynamic systems plays a key role for neuromorphic computing which is expected to reduce the ever-increasing power consumption of machine learning and artifical intelligence applications. For spin waves (magnons), nonlinearity combined with phase coherence is the basis of phenomena like Bose-Einstein condensation, frequency combs, and pattern recognition in neuromorphic computing. Yet, the broadband electrical detection of these phenomena with high frequency resolution remains a challenge. Here, we demonstrate the generation and detection of phase-coherent nonlinear magnons in an all-electrical GHz probe station based on coplanar waveguides connected to a vector network analyzer which we operate in a frequency-offset mode. Making use of an unprecedented frequency resolution, we resolve the nonlocal emergence of a fine structure of propagating nonlinear magnons, which sensitively depends on both power and a magnetic field. These magnons are shown to maintain coherency with the microwave source while propagating over macroscopic distances. We propose an inter-band four magnon scattering scheme which is in agreement with the field-dependent characteristics of coherent nonlocal signals in the nonlinear excitation regime. Our findings are key to enable the seamless integration of nonlinear magnon processes into high-speed microwave electronics and to advance phase-encoded information processing in magnonic neuronal networks.

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Stimulated Amplification of Propagating Spin Waves

Cited by 7 publications

References 44 publications

The 2024 magnonics roadmap

The 2024 magnonics roadmap

Spin wave-driven variable-phase mutual synchronization in spin Hall nano-oscillators

Emergent nonlinear modes in coherent magnon circuits detected at ultrahigh frequency resolution

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