Qi Wang, Gyorgy Csaba, Roman Verba, Andrii V. Chumak, and Philipp Pirro
Phys. Rev. Applied 21, 040503 (2024) – Published 24 April 2024
Spin waves and their quanta magnons are the collective excitations of a spin systems of a magnetic material, which offer the potential for higher efficiency and lower energy consumption in solving specific issues in data processing. This Perspective discusses the current challenges in realizing magnonic circuits based on the building blocks developed to date, and further looks at the application of magnons in neuromorphic networks and stochastic, reservoir, and quantum computing, and discusses their advantages over conventional electronics in these areas.
Joseph Shaji Rebeirro, Muhib Omar, Till Lenz, Omkar Dhungel, Peter Blümler, Dmitry Budker, and Arne Wickenbrock
Phys. Rev. Applied 21, 044039 (2024) – Published 22 April 2024
Microwave-free magnetometry with N- centers has emerged as a complementary method to traditional techniques when the use of microwaves is impractical, particularly in applications involving metals and biological samples. Integration of this method with imaging capabilities offers the potential for nondestructive probing in a 2D spatial plane, while also capturing temporal dynamics within existing technological constraints. It is evident that the limits of sensitivity have not been fully realized, and improvements may be achieved via faster specialized cameras and advanced color-center fabrication.
Phys. Rev. Applied 21, 044026 (2024) – Published 15 April 2024
The ultrafast all-optical control of magnetization without relying on heat is promising for magnetic recording technology. While the magnetization switching between two stable bit states does not require control over light polarization, photomagnetic toggling of magnetization (equivalent to the XOR logic operation) can be achieved. This study probes the efficiency of a back-switching scenario between two stable bit states, using a pair of femtosecond laser pulses with either the same or orthogonal orientations of linear polarization. Such a nonthermal toggle regime not only can provide recording at rates up to 50 GHz, but also can perform basic logic operations.
Phys. Rev. Applied 21, 044024 (2024) – Published 12 April 2024
Spin pumping can generate spin current by driving a magnetic system into resonance, a phenomenon that can be electrically detected via the inverse spin Hall effect. However, the efficiency of spin current generation has remained limited, compared to that of spin-to-charge conversion. This work systematically demonstrates an innovative technique for electrically probing propagating spin waves and creating spin current with high efficiency, mediated by flat-band magnons excited by broad wave vectors. These findings lay a promising foundation for further experiments with propagating spin waves.
Phys. Rev. Applied 21, 044023 (2024) – Published 12 April 2024
The development of gain-driven polaritons offers a fresh approach to enhancing solid-state microwave sources and amplifiers, apart from the traditional concept of the maser. Despite their potential, these polaritons are governed by intricate dynamics that remain largely unexplored, impeding practical applications. The authors employ time-domain measurements to investigate the transient response of gain-driven polaritons, revealing distinct dynamical behaviors: damping, zero damping, and antidamping. This insight could impact the engineering of ultrafast polaritonic devices tailored for coherent microwave and optical applications.
