Tunable Magnon-Magnon Coupling Mediated by Dynamic Dipolar Interaction in Synthetic Antiferromagnets

Shiota, Yoichi; Taniguchi, Tomohiro; Ishibashi, Mumio; Moriyama, Takahiro; Ono, Teruo

doi:10.1103/physrevlett.125.017203

Cited by 99 publications

(86 citation statements)

References 41 publications

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“…Note added. We became aware that similar magnonmagnon coupling in synthetic antiferromagnets has been observed for finite wavelength spin-waves by Shiota et al [51].…”

supporting

confidence: 63%

Tunable magnon-magnon coupling in synthetic antiferromagnets

et al. 2020

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“…Note added. We became aware that similar magnonmagnon coupling in synthetic antiferromagnets has been observed for finite wavelength spin-waves by Shiota et al [51].…”

supporting

confidence: 63%

Tunable magnon-magnon coupling in synthetic antiferromagnets

et al. 2020

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“…This introduces an in-situ control over the coupling strength between the two antiferromagnetic modes. [4][5][6] In the case of a small interlayer exchange field B ex or for the in-plane condition, the acoustic and optic modes [see Fig. 7(a)] cannot interact strongly at their point degenerate a energy, showing a mode crossing.…”

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

“…There are other avenues to control the coupling between magnons in these types of layered magnets that are being both experimentally and computationally explored. 6,7 To begin this discussion, we first note that the earlier summarized works rely on the generation of spatially uniform optical and acoustic magnons. In other words, these modes are antiferromagnetic resonances corresponding to a magnon wavenumber near k = 0.…”

Section: Magnon-magnon Coupling Mechanisms In Layered Systemsmentioning

confidence: 99%

“…For k = 0 magnons, the dynamic dipolar magnetic field associated with an optical(acoustic) mode can couple the magnon to the other acoustic(optical) magnon. 6 Shiota et al realized this dynamic-dipolar coupling of optical and acoustic magnons in SAFs recently in 2020. For a finite value of k, the magnon-magnon coupling was observed to be dependent upon the relative orientation between the in-plane external field and the magnon wavevector.…”

Section: Magnon-magnon Coupling Mechanisms In Layered Systemsmentioning

confidence: 99%

“…Both synthetic antiferromagnets and van der Waals magnets have an antiferromagnetic interlayer exchange interaction that enables acoustic and optical magnons. Unique to these materials is that the interaction between acoustic and optical magnons (or even amongst optical and acoustic magnons) can be continuously tuned via field orientation, 4,5 wave number, 6 or magnetic damping. 7 As a consequence, the magnon energy spectrum can be manipulated via the tunable magnon-magnon interaction strength.…”

Section: Introductionmentioning

confidence: 99%

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Quantum technology has made tremendous strides over the past two decades with remarkable advances in materials engineering, circuit design and dynamic operation. In particular, the integration of different quantum modules has benefited from hybrid quantum systems, which provide an important pathway for harnessing the different natural advantages of complementary quantum systems and for engineering new functionalities. This review focuses on the current frontiers with respect to utilizing magnetic excitatons or magnons for novel quantum functionality. Magnons are the fundamental excitations of magnetically ordered solid-state materials and provide great tunability and flexibility for interacting with various quantum modules for integration in diverse quantum systems. The concomitant rich variety of physics and material selections enable exploration of novel quantum phenomena in materials science and engineering. In addition, the relative ease of generating strong coupling and forming hybrid dynamic systems with other excitations makes hybrid magnonics a unique platform for quantum engineering. We start our discussion with circuit-based hybrid magnonic systems, which are coupled with microwave photons and acoustic phonons. Subsequently, we are focusing on the recent progress of magnon-magnon coupling within confined magnetic systems. Next we highlight new opportunities for understanding the interactions between magnons and nitrogen-vacancy centers for quantum sensing and implementing quantum interconnects. Lastly, we focus on the spin excitations and magnon spectra of novel quantum materials investigated with advanced optical characterization.

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Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄

Dai

et al. 2023

Adv Funct Materials

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As new information carriers, antiferromagnetic magnons have great potential in the fields of spintronics and quantum information. However, the strong exchange interaction between sublattice spins in conventional antiferromagnets results in their frequencies up to the terahertz (THz) range, hindering further exploration of related applications and physics. Recently, emerging van der Waals A‐type antiferromagnets with the weak exchange interaction may bring about a change. In this study, it demonstrates two distinct tunable ultrastrong magnon–magnon couplings in the gigahertz (GHz) band using this type of antiferromagnet, CrPS4, with a maximum normalized coupling strength (η) of 0.31. It establishes orthorhombic and monoclinic models for theoretical analyses, unambiguously showing that the ultrastrong coupling strength is caused by unique magnetocrystalline anisotropy rather than exchange enhancement. Furthermore, for the first time, it observes a continuous switching process of sublattice magnon chirality arising from the orthorhombic nature of anisotropy. These findings not only deepen the understanding of antiferromagnetic spin dynamics but also offer a powerful platform for building magnonic quantum systems and chirality‐based spintronics.

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Tunable Magnon-Magnon Coupling Mediated by Dynamic Dipolar Interaction in Synthetic Antiferromagnets

Cited by 99 publications

References 41 publications

Tunable magnon-magnon coupling in synthetic antiferromagnets

Tunable magnon-magnon coupling in synthetic antiferromagnets

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄

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Tunable Magnon-Magnon Coupling Mediated by Dynamic Dipolar Interaction in Synthetic Antiferromagnets

Cited by 99 publications

References 41 publications

Tunable magnon-magnon coupling in synthetic antiferromagnets

Tunable magnon-magnon coupling in synthetic antiferromagnets

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS4

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Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄