Tunable magnon-magnon coupling in synthetic antiferromagnets

Sud, A.; Zollitsch, Christoph W.; Kamimaki, Akira; Dion, Troy; Khan, Safe; Iihama, Satoshi; Mizukami, Shigemi; Kurebayashi, Hidekazu

doi:10.1103/physrevb.102.100403

Cited by 68 publications

(77 citation statements)

References 48 publications

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“…This reflects that in the coupled state the acoustic and optic mode no longer are individual and form a single hybrid system with a combined loss rate. 5 Similar results were also found in magnetic hybrid structures. 120…”

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetssupporting

confidence: 76%

“…We here review recent progress of magnon-magnon coupling of uniform spin-wave modes in synthetic antiferromagnets. 5 To hybridize the acoustic and optical modes, the twofold rotational symmetry of the two magnetisation vectors about the dc magnetic field needs to be broken. 4 This is , e.g., by applying a dc magnetic field (B 0 ) at an angle θ B with respect to the film plane; see the schematic coordinate system in Fig.…”

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

“…This breaks the rotational symmetry and enables an interaction between the two magnon modes. 4,5 Furthermore, the strength of the interaction increases as the out-of-plane angle increases. This introduces an in-situ control over the coupling strength between the two antiferromagnetic modes.…”

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

“…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%

“…7 antiferromagnets. 5 Figure 7(b) represents spin-wave spectra measured by using a broad-band microwave transmission line with the sample placed on top of it, as a function of microwave frequency and dc magnetic field. For smaller θ B a clear gap is showing at the degeneracy point of the acoustic and optic modes.…”

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

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

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

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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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Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetssupporting

confidence: 76%

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

Section: A Magnon-magnon Coupling In Synthetic Antiferromagnetsmentioning

confidence: 99%

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

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

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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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Bias‐Field Tunable Magnon‐Magnon Coupling in Ni₈₀Fe₂₀ Nanocross Array

et al. 2023

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Hybrid dynamical systems have gained a huge momentum not only due to their exotic physical properties but also their compelling engineering standpoint, particularly owing to their potential for coherent information processing. Remarkably, magnon-magnon coupling is experimentally identified in Ni 80 Fe 20 nanocross array with the number of spins reaching a very low value of ≈10 12 . Moreover, the coupling strength is effectively tuned via different external parameters, viz. microwave excitation power and the bias-field orientation. Extensive simulations reveal that both the static and dynamical dipolar coupling contribute to the observed anticrossing phenomenon. Simultaneously, mode-softening of spin wave tunable by subtle changes of bias-field orientation is also observed. The findings can greatly enrich various hybrid phenomena with a magnonic platform.

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Tunable magnon-magnon coupling in synthetic antiferromagnets

Cited by 68 publications

References 48 publications

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

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

Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄

Bias‐Field Tunable Magnon‐Magnon Coupling in Ni₈₀Fe₂₀ Nanocross Array

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Tunable magnon-magnon coupling in synthetic antiferromagnets

Cited by 68 publications

References 48 publications

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

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

Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS4

Bias‐Field Tunable Magnon‐Magnon Coupling in Ni80Fe20 Nanocross Array

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Product

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Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄

Bias‐Field Tunable Magnon‐Magnon Coupling in Ni₈₀Fe₂₀ Nanocross Array