Strong Coupling of an 
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 Alloy with Ultralow Damping to Superconducting Co-planar Waveguide Resonators

Haygood, Ian W.; Pufall, Matthew R.; Edwards, Eric R. J.; Shaw, Justin M.; Rippard, William H.

doi:10.1103/physrevapplied.15.054021

Cited by 14 publications

(8 citation statements)

References 45 publications

(48 reference statements)

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“…Using M S = 180 emu/cm 3 at 2 K for the YIG/YSGG film, we determine the average coupling strength to an individual spin to be g s /2π = 25.1 Hz. This coupling strength g s /2π is comparable to other reports on microwave photon-magnon coupling using ferromagnetic metals − and similar CPW resonator-ferromagnet structures. Considering that the microwave magnetic field in the gap of a CPW (where our YIG strip is located) is weaker than that for a ferromagnet directly on top of (or underneath) the superconducting center conductor channel, one can achieve stronger microwave photon-magnon coupling by positioning the YIG strip near a stronger microwave magnetic field or utilizing resonator designs such as a lumped-element LC resonator, which can provide far stronger coupling strength …”

supporting

confidence: 85%

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y₃Fe₅O₁₂ Films at 2 K

et al. 2023

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Y3Fe5O12 is arguably the best magnetic material for magnonic quantum information science (QIS) because of its extremely low damping. We report ultralow damping at 2 K in epitaxial Y3Fe5O12 thin films grown on a diamagnetic Y3Sc2Ga3O12 substrate that contains no rare-earth elements. Using these ultralow damping YIG films, we demonstrate for the first time strong coupling between magnons in patterned YIG thin films and microwave photons in a superconducting Nb resonator. This result paves the road toward scalable hybrid quantum systems that integrate superconducting microwave resonators, YIG film magnon conduits, and superconducting qubits into on-chip QIS devices.

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supporting

confidence: 85%

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y₃Fe₅O₁₂ Films at 2 K

et al. 2023

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“…In this case, the width of the vortex resonance γ v will be enlarged if enough paramagnetic spins on the surface of the nanodisc satisfy the resonance condition. The line width γ v can be experimentally measured using superconducting microcircuits that can be optimally coupled to magnonic resonators. ,− In this way, the target spins can be deposited in powder or crystal form or from solution on the surface of the disc for nanoscopic EPR imaging.…”

Section: Resultsmentioning

confidence: 99%

Scanning Spin Probe Based on Magnonic Vortex Quantum Cavities

González-Gutiérrez,

García-Pons,

Zueco

et al. 2024

ACS Nano

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Performing nanoscale scanning electron paramagnetic resonance (EPR) requires three essential ingredients: First, a static magnetic field together with field gradients to Zeeman split the electronic energy levels with spatial resolution; second, a radio frequency (rf) magnetic field capable of inducing spin transitions; finally, a sensitive detection method to quantify the energy absorbed by spins. This is usually achieved by combining externally applied magnetic fields with inductive coils or cavities, fluorescent defects, or scanning probes. Here, we theoretically propose the realization of an EPR scanning sensor merging all three characteristics into a single device: the vortex core stabilized in ferromagnetic thin-film discs. On one hand, the vortex ground state generates a significant static magnetic field and field gradients. On the other hand, the precessional motion of the vortex core around its equilibrium position produces a circularly polarized oscillating magnetic field, which is enough to produce spin transitions. Finally, the spin−magnon coupling broadens the vortex gyrotropic frequency, suggesting a direct measure of the presence of unpaired electrons. Moreover, the vortex core can be displaced by simply using external magnetic fields of a few mT, enabling EPR scanning microscopy with large spatial resolution. Our numerical simulations show that, by using low damping magnets, it is theoretically possible to detect single spins located on the disc's surface. Vortex nanocavities could also attain strong coupling to individual spin molecular qubits with potential applications to mediate qubit−qubit interactions or to implement qubit readout protocols.

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“…YIG thin films are not easily compatible with conventional lithography processes [23] nor for cryogenic operation as the optimum substrate material for YIG growth becomes lossy with decreasing temperature [24]. For these reasons, other CMOS compatible materials like Permalloy (Py, with a moderate α ∼ 10 −2 ) [7,[25][26][27] or iron-cobalt alloys (Fe 75 Co 25 , with a very promising α ∼ 10 −3 ) are drawing attention [28,29].…”

Section: Introductionmentioning

confidence: 99%

Measuring the Magnon-Photon Coupling in Shaped Ferromagnets: Tuning of the Resonance Frequency

et al. 2023

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Cavity photons and ferromagnetic spin excitations can exchange information coherently in hybrid architectures, at speeds set by their mutual coupling strength. Speed enhancement is usually achieved by optimizing the geometry of the electromagnetic cavity. Here we show that the geometry of the ferromagnet also plays a role, by setting the fundamental frequency of the magnonic resonator. Using focused ion-beam patterning, we vary the aspect ratio of different Permalloy samples reaching operation frequencies above 10 GHz while working at low external magnetic fields. Additionally, we perform broadband ferromagnetic resonance measurements and cavity experiments that demonstrate that the light-matter coupling strength can be estimated using either open transmission lines or resonant cavities, yielding very good agreement. Finally, we describe a simple theoretical framework based on electromagnetic and micromagnetic simulations that successfully accounts for the experimental results. This approach can be used to design hybrid quantum systems exploiting magnetostatic mode excited in ferromagnets of arbitrary size and shape and to tune their operation conditions.

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Strong Coupling of an Fe - Co Alloy with Ultralow Damping to Superconducting Co-planar Waveguide Resonators

Cited by 14 publications

References 45 publications

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y₃Fe₅O₁₂ Films at 2 K

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y₃Fe₅O₁₂ Films at 2 K

Scanning Spin Probe Based on Magnonic Vortex Quantum Cavities

Measuring the Magnon-Photon Coupling in Shaped Ferromagnets: Tuning of the Resonance Frequency

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Strong Coupling of an Fe - Co Alloy with Ultralow Damping to Superconducting Co-planar Waveguide Resonators

Cited by 14 publications

References 45 publications

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y3Fe5O12 Films at 2 K

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y3Fe5O12 Films at 2 K

Scanning Spin Probe Based on Magnonic Vortex Quantum Cavities

Measuring the Magnon-Photon Coupling in Shaped Ferromagnets: Tuning of the Resonance Frequency

Contact Info

Product

Resources

About

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y₃Fe₅O₁₂ Films at 2 K

Strong on-Chip Microwave Photon–Magnon Coupling Using Ultralow-Damping Epitaxial Y₃Fe₅O₁₂ Films at 2 K