Generation of Spin-Wave Pulses by Inverse Design

Casulleras, Silvia; Knauer, Sebastian; Wang, Qi; Romero‐Isart, Oriol; Chumak, A. V.; Gonzalez-Ballestero, Carlos

doi:10.1103/physrevapplied.19.064085

Phys. Rev. Applied

2023

DOI: 10.1103/physrevapplied.19.064085

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Generation of Spin-Wave Pulses by Inverse Design

Silvia Casulleras

Sebastian Knauer

Qi Wang

et al.

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Cited by 4 publications

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Noise‐Based Damping of Chaotic Entanglement in Pulsed Driven Two‐Qubit System

Abd‐Rabbou,

Khalil,

Al‐Awfi

2023

Annalen der Physik

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This paper investigates the entanglement dynamics of a two‐qubit system in the presence of n‐sequential sin 2‐pulse shape. The study explores entanglement under two scenarios: when the system is completely isolated from the environment and when it interacts with one of the surrounding environments, namely the thermal environment and the common dephasing environment. The authors quantify entanglement through concurrence while systematically examining the effects of initial state preparation, qubit coupling strength, laser‐qubit interaction intensity, pulse sequences, and decohering environments. The results highlight that the entanglement of the two‐qubit system strongly depends on the initial state. Increasing the coupling strength between the qubits and the n‐sequential pulse enhances the maximum values of entanglement. Conversely, augmenting the laser‐qubits coupling or introducing the influence of the environment diminishes the entanglement.

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Noise‐Based Damping of Chaotic Entanglement in Pulsed Driven Two‐Qubit System

Abd‐Rabbou,

Khalil,

Al‐Awfi

2023

Annalen der Physik

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Frequency-selective coherent propagating spin waves induced by localized perpendicular magnetic anisotropy nanofilm stack

Wang,

Xu,

Zhang

et al. 2024

Applied Physics Letters

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Magnonics has long been hailed as a promising technology poised to overcome the heat dissipation challenges in traditional electronic devices. With the escalating integration level of magnon devices, the demand arises for lower external field excitation conditions, coupled with enhanced coherence and frequency-selective excitation characteristics. In this proposal, we suggest introducing a localized perpendicular magnetic anisotropy nanofilm stack into the spin-wave transmission channel to finely regulate the propagation characteristics of spin waves. This adjustment can be achieved by altering the width and period of the stack in both horizontal and vertical dimensions. Additionally, the optimal transmission characteristics of spin waves are achieved at low frequencies (1–1.67 GHz) and in the presence of small magnetic fields (0–20 mT). Frequency-selective spin waves with triggering stability can effectively prevent signal folding resulting from changes in microwave power within the range of −30 to 0 dBm. At 1.08 GHz, the group velocity of frequency-selective spin waves can be increased by up to 2.86 times. This innovative method of regulating spin waves presents a potential alternative pathway for the development of future magnonic circuits.

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Coherent spin wave excitation with radio-frequency spin–orbit torque

Morrison,

Taghinejad,

Analytis

et al. 2024

Journal of Applied Physics

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Spin waves, collective perturbations of magnetic moments, are both fundamental probes for magnetic physics and promising candidates for energy-efficient signal processing and computation. Traditionally, coherent propagating spin waves have been generated by radio frequency (RF) inductive Oersted fields from current-carrying electrodes. An alternative mechanism, spin–orbit torque (SOT), offers more localized excitation through interfacial spin accumulation but has been mostly limited to DC to kHz frequencies. SOT driven by RF currents, with potentially enhanced pumping efficiency and unique spin dynamics, remains largely unexplored, especially in magnetic insulators. Here, we conduct a comprehensive theoretical and computational investigation into the generation of coherent spin waves via RF-SOT in the prototypical yttrium iron garnet. We characterize the excitation of forward volume, backward volume, and surface modes in both linear and nonlinear regimes, employing single and interdigitated electrode configurations. We reveal and explain several unique and surprising features of RF-SOT compared to inductive excitation, including higher efficiency, distinct mode selectivity, and directional symmetry, a ∼3π/4 phase offset, reduced anharmonic distortion in the nonlinear regime, and the absence of second harmonic generation. These insights position RF-SOT as a promising new mechanism for future magnonic and spintronic applications.

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Generation of Spin-Wave Pulses by Inverse Design

Cited by 4 publications

References 47 publications

Noise‐Based Damping of Chaotic Entanglement in Pulsed Driven Two‐Qubit System

Noise‐Based Damping of Chaotic Entanglement in Pulsed Driven Two‐Qubit System

Frequency-selective coherent propagating spin waves induced by localized perpendicular magnetic anisotropy nanofilm stack

Coherent spin wave excitation with radio-frequency spin–orbit torque

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