Low-damping ferromagnetic resonance in electron-beam patterned, high-Q vanadium tetracyanoethylene magnon cavities

Franson, Andrew; Zhu, Na; Kurfman, Seth; Chilcote, Michael; Candido, Denis R.; Buchanan, Kristen; Flatté, Michael E.; Tang, Hong X.; Johnston-Halperin, Ezekiel

doi:10.1117/12.2569994

Cited by 3 publications

(8 citation statements)

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“…Fitting angle-resolved FMR, we extract an effective field 4πM ef f = 68 Oe. The FWHM linewidth is 1.1 Oe, which is comparable to previously reported values [6].…”

Section: Ferromagnetic Resonancesupporting

confidence: 90%

“…Next we explain the procedure of extracting the total magnetic moment from the FMR signal strength. The change in waveguide transmission parameter on magnetic resonance is [40,41] ∆S 21 (H res ) ∝ γµ 0 M s ld m 8Z 0 αw (6) where l is the film length along the transmission line, d m is the film thickness, Z 0 is the characteristic impedance of the transmission line, and α is the Gilbert damping. At a fixed resonance field, the absorption curve FWHM is ∆H f whm = 2αH res .…”

Section: E Fmr Data Analysismentioning

confidence: 99%

“…We observe a nonlinear dependence of laser damage on optical power, which is consistent with a heating-based laser damage mechanism. Instead of being merely a nuisance, this local laser damage opens up a new avenue of V [TCNE] x patterning, which is an alternative to electron-beam patterning [6]. We show preliminary results on laser patterning of V [TCNE] x and discuss its resolution limit.…”

Section: Introductionmentioning

confidence: 97%

“…In comparison, vanadium tetracyanoethylene (V [TCNE] x , x ≈ 2) is a low loss organic-based material with intrinsic damping comparable to YIG, and it can be grown as a film with chemical vapor deposition at a mild temperature (50 • C) and on nearly arbitrary substrates [4,5]. Furthermore, V [TCNE] x can be patterned using electron-beam lithography lift-off techniques while retaining its low magnetic loss [6]. Hence it is an attractive alternative for magnonics.…”

Section: Introductionmentioning

confidence: 99%

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Raman Spectroscopy and Aging of the Low-Loss Ferrimagnet Vanadium Tetracyanoethylene

Cheung¹,

Chilcote²,

Yusuf³

et al. 2021

Preprint

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Vanadium tetracyanoethylene (V [TCNE]x, x ≈ 2) is an organic-based ferrimagnet with a high magnetic ordering temperature TC > 600 K, low magnetic damping, and growth compatibility with a wide variety of substrates. However, similar to other organic-based materials, it is sensitive to air. Although encapsulation of V [TCNE]x with glass and epoxy extends the film lifetime from an hour to a few weeks, what is limiting its lifetime remains poorly understood. Here we characterize encapsulated V[TCNE]x films using confocal microscopy, Raman spectroscopy, ferromagnetic resonance and SQUID magnetometry. We identify the relevant features in the Raman spectra in agreement with ab initio theory, reproducing C = C, C ≡ N vibrational modes. We correlate changes in the effective dynamic magnetization with changes in Raman intensity and in photoluminescence. Based on changes in Raman spectra, we hypothesize possible structural changes and aging mechanisms in V [TCNE]x. These findings enable a local optical probe of V [TCNE]x film quality, which is invaluable in experiments where assessing film quality with local magnetic characterization is not possible.

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“…Fitting angle-resolved FMR, we extract an effective field 4πM ef f = 68 Oe. The FWHM linewidth is 1.1 Oe, which is comparable to previously reported values [6].…”

Section: Ferromagnetic Resonancesupporting

confidence: 90%

Section: E Fmr Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Raman Spectroscopy and Aging of the Low-Loss Ferrimagnet Vanadium Tetracyanoethylene

Cheung¹,

Chilcote²,

Yusuf³

et al. 2021

Preprint

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“…This hybrid quantum system can enable entanglement between NV centers separated by ≈ 1 µm. Our proposal relies on the magnetic properties of the low loss organic ferrimagnetic material vanadium tetracyanoethylene [25][26][27][28][29][30][31][32] (V[TCNE] x ) to overcome the challenges of building and integrating low loss magnetic materials on diamond. V [TCNE] x can be grown without lattice-matched substrates and patterned at the micron scale into arbitrary shapes while maintaining its low magnetic damping 32 (Gilbert parameter α = 4 × 10 −5 , comparable to values obtained under the best conditions for YIG).…”

mentioning

confidence: 99%

Predicted strong coupling of solid-state spins via a single magnon mode

Candido,

Fuchs,

Johnston-Halperin

et al. 2020

Preprint

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We propose an approach to realize a hybrid quantum system composed of a diamond nitrogen-vacancy (NV) center spin coupled to a magnon mode of the low-damping, low-moment organic ferrimagnet vanadium tetracyanoethylene. We derive an analytical expression for the spin-magnon cooperativity as a function of NV position under a micron-scale perpendicularly magnetized disk, and show that, surprisingly, the cooperativity will be higher using this magnetic material than in more conventional materials with larger magnetic moments, due to in part to the reduced demagnetization field.For reasonable experimental parameters, we predict that the spin-magnon-mode coupling strength is g ∼ 10 kHz. For isotopically pure 12 C diamond we predict strong coupling of an NV spin to the unoccupied magnon mode, with cooperativity C = 6 for a wide range of NV spin locations within the diamond, well within the spatial precision of NV center implantation. Thus our proposal describes a practical pathway for single-spin-state-to-single-magnon-occupancy transduction and for entangling NV centers over micron length scales.

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Raman Spectroscopy and Aging of the Low-Loss Ferrimagnet Vanadium Tetracyanoethylene

et al. 2021

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We report on micro-focused Raman spectroscopy of encapsulated vanadium tetracyanoethylene (V[TCNE] x , x ≈ 2) films as they age under ambient conditions to understand the structural changes that accompany aging and how those changes influence the magnetic properties. V[TCNE] x is an organic-based ferrimagnet with a high magnetic ordering temperature T C > 600 K, low magnetic damping, and growth compatibility with a wide variety of substrates. However, similar to other organic-based materials, it is sensitive to air. Although encapsulation of V[TCNE] x with glass and epoxy extends the film lifetime from hours to weeks, its aging processes remain poorly understood. We identify the relevant features in the Raman spectra in agreement with ab initio theory, reproducing CC and CN stretching vibrational modes. We correlate changes in the Raman intensity and in photoluminescence to changes in the magnetic properties of the sample as measured using ferromagnetic resonance and magnetometry. Based on changes in the Raman spectra, we hypothesize structural changes and aging mechanisms in V[TCNE] x . We also find that we can introduce similar changes using focused laser illumination at high intensity, enabling a new mechanism for “erasing” magnetism in this material through selective modification of local bonding. These findings enable a local optical probe of V[TCNE] x film quality, which is invaluable in experiments where assessing film quality with local magnetic characterization is not possible, and they enable patterning of V[TCNE] x by laser writing.

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Low-damping ferromagnetic resonance in electron-beam patterned, high-Q vanadium tetracyanoethylene magnon cavities

Cited by 3 publications

References 0 publications

Raman Spectroscopy and Aging of the Low-Loss Ferrimagnet Vanadium Tetracyanoethylene

Raman Spectroscopy and Aging of the Low-Loss Ferrimagnet Vanadium Tetracyanoethylene

Predicted strong coupling of solid-state spins via a single magnon mode

Raman Spectroscopy and Aging of the Low-Loss Ferrimagnet Vanadium Tetracyanoethylene

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