The dielectric constant of gadolinium gallium garnet and α -Al<sub>2</sub>O<sub>3</sub>single crystals

Lal, K.; Jhans, H.

doi:10.1088/0022-3719/10/8/034

Cited by 19 publications

(7 citation statements)

References 4 publications

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“…The saturation magnetization is µ 0 M s ≃ 175 mT for YIG [30], where the frequency corresponding to magnetization is ω M = gµ B µ 0 M s / ≃ 4.89 × 2π GHz. µ B is the Bohr magneton, the g-factor is g = 2, and the coherence length of the exchange interaction is λ ex ≃ 1.76×10 −8 m. The dielectric constant is ǫ M = 15 for YIG [31] and ǫ b = 12 for GGG [32].…”

Section: Resultsmentioning

confidence: 99%

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Kato,

Yokoyama,

Ishihara

2021

Preprint

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Magnon-polaritons (MPs) refer to a light-magnon coupled state and can potentially act as information carriers, possibly enabling charge-free computation. However, the light-magnon coupling is inherently weak. To achieve sufficiently strong coupling, a large ferromagnet or coupling with a microwave cavity is necessary. Herein, we theoretically propose a fundamental platform for magnonic and magnon-optical information storage devices and discuss the transport properties of MP's. The proposed multi-layered structure overcomes the aforementioned issues. Owing to the waveguide modes, magnons placed in a nanometer-thin layer are strongly coupled with light, exhibiting rich functionalities of thick-layer MPs via the 'magnetic antenna effect'. Thus, the thin-layer MPs are faster, and the direction is switchable. The results of this study will enable the integration of ferromagnetic micro and nanostructures for MP-based information devices without any restrictions due to cavities.

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Section: Resultsmentioning

confidence: 99%

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Kato,

Yokoyama,

Ishihara

2021

Preprint

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“…Literature survey shows that the work on electrical properties on garnets is limited. Electrical conductivity in GGG was reported by Krishan Lal and Jhans [8]. Dielectric constants on several gallium garnets at room temperature were reported by Shannon et.…”

Section: Introductionmentioning

confidence: 89%

Dielectric properties and Electrical Conductivity Studies on Neodymium and Chromium co-doped Gadolinium Scandium Gallium Garnet (GSGG:Nd:Cr)

Krishna¹

2013

IOSR-JAP

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“…While Pt has a strong optical absorption (~10 7 cm -1 ) 28 , enhanced by the Etalon effect 29 , the absorption in GGG|YIG (10 cm -1 ) is essentially negligible. 30,31 The electrons in Pt are heated within a few tens of femtoseconds 18 . At the short timescales after laser absorption (~ 1 ps) probed in our measurement, thermalisation of these hot electrons mainly occurs via two mechanisms.…”

Section: Takedownmentioning

confidence: 99%

“…The Pt layer has a strong optical absorption (~10 ] cm <`)28 that is enhanced by the Etalon effect 29 , while the absorption in GGG|YIG (10 cm <`) is essentially negligible. 30,31 We estimate that for an absorbed fluence of 0.15 mJ/cm 2 ∆ , bc ~200 K at 10 K 18 , taking the electron-phonon coupling constant M <de = 10 `f W • m <i K <` and the electron heat capacity j / = 750 J • m <i K <C . 32 To understand the origin of the temperature dependence of the picosecond LSSE in Fig.…”

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confidence: 99%

Temperature dependence of the picosecond spin Seebeck effect

Kholid

Hamara

Terschanski

et al. 2021

Applied Physics Letters

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We performed temperature-dependent optical pump -THz emission measurements in Y3Fe5O12 (YIG)|Pt from 5 K to room temperature in the presence of an externally applied magnetic field. We study the temperature dependence of the spin Seebeck effect and observe a continuous increase as temperature is decreased, opposite to what is observed in electrical measurements where the spin Seebeck effect is suppressed as 0 K is approached. By quantitatively analysing the different contributions we isolate the temperature dependence of the spin-mixing conductance and observe features that are correlated to the bands of magnon spectrum in YIG.The longitudinal spin Seebeck effect (LSSE) 1 describes the transfer of a spin current from a magnetic insulator driven by a temperature gradient. An adjacent heavy metal (HM) layer with large spin orbit coupling is typically used to convert the spin current into an electrical signal via the inverse spin Hall effect (ISHE). 2,3 The LSSE has been measured in a variety of different materials such as ferromagnets 1,4,5 , anti-ferromagnets 6,7 and paramagnets. 8 Magnetic insulators (MI) such as Y3Fe5O12 (Yttrium Iron Garnet -YIG) are particularly interesting for studies on the LSSE since the absence of electron charge transport allows the roles of magnons and phonons to be identified in the spin transfer. 1,3,9,10 Temperature, thickness and magnetic field dependence studies have contributed to a phenomenological picture of magnon-driven spin current. [11][12][13][14][15] A temperature gradient across the magnetic insulator thickness leads to the diffusion of thermal magnons that accumulate at the interface with the HM. 16,17 The temperature dependence of the magnon propagation length m results in a characteristic peak in the SSE signal at low temperature when the thickness of the MI is comparable to m . 12 Low frequency magnons play a dominant role due to their large population and

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The dielectric constant of gadolinium gallium garnet and α -Al₂O₃single crystals

Cited by 19 publications

References 4 publications

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Dielectric properties and Electrical Conductivity Studies on Neodymium and Chromium co-doped Gadolinium Scandium Gallium Garnet (GSGG:Nd:Cr)

Temperature dependence of the picosecond spin Seebeck effect

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The dielectric constant of gadolinium gallium garnet and α -Al2O3single crystals

Cited by 19 publications

References 4 publications

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Functionalized high-speed magnon-polaritons resulting from the magnetic antenna effect

Dielectric properties and Electrical Conductivity Studies on Neodymium and Chromium co-doped Gadolinium Scandium Gallium Garnet (GSGG:Nd:Cr)

Temperature dependence of the picosecond spin Seebeck effect

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The dielectric constant of gadolinium gallium garnet and α -Al₂O₃single crystals