Optical properties of epitaxial iron garnet thin films

Wemple, S. H.; Blank, S. L.; Seman, J. A.; Biolsi, W. A.

doi:10.1103/physrevb.9.2134

Cited by 118 publications

(37 citation statements)

References 31 publications

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“…We are only aware of low temperature optical data for Pt acquired at 77 K, and 87 K for YIG. As and for Pt and YIG do not vary significantly at low temperature (77 K and 87 K) [33,34] and room temperature (300 K) [35] we expect that and for Pt and YIG at 23 K are similar to their values at 77 K. Due to the thin nature of the Pt layer, we also considered the reflected power from the Pt/YIG interface that is being re-absorbed in the Pt layer. The reflectivity of the interface is calculated using the Fresnel equation [35] yielding 56% (46%).…”

Section: Thermal Transport Modelingmentioning

confidence: 99%

Long-range pure magnon spin diffusion observed in a nonlocal spin-Seebeck geometry

et al. 2015

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The spin diffusion length for thermally excited magnon spins is measured by utilizing a non-local spin-Seebeck effect measurement. In a bulk single crystal of yttrium iron garnet (YIG) a focused laser thermally excites magnon spins. The spins diffuse laterally and are sampled using a Pt inverse spin Hall effect detector. Thermal transport modeling and temperature dependent measurements demonstrate the absence of spurious temperature gradients beneath the Pt detector and confirm the non-local nature of the experimental geometry. Remarkably, we find that thermally excited magnon spins in YIG travel over 120 µm at 23 K, indicating that they are robust against inelastic scattering. The spin diffusion length is found to be at least 47 µm and as high as 73 µm at 23 K in YIG, while at room temperature it drops to less than 10 µm. Based on this long spin diffusion length, we envision the development of thermally powered spintronic devices based on electrically insulating, but spin conducting materials.2

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Section: Thermal Transport Modelingmentioning

confidence: 99%

Long-range pure magnon spin diffusion observed in a nonlocal spin-Seebeck geometry

et al. 2015

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“…However, the possibility of Fe-Fe charge transfer cannot be excluded (14). From a derivative of the absorption spectrum Wemple et al (15) and Blazey (16) find an extra band at 3.16 eV which they also attribute to a. charge transfer transition. Our high temperature conduction measurements gave avalue of 2.85 eV (or avalue smaller than 3.16 eV) for the energy gap.…”

Section: High Temperature Electrical Measurementsmentioning

confidence: 99%

Defects and the electronic properties of Y3Fe5O12

Larsen

Metselaar

1975

Journal of Solid State Chemistry

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The electrical and the optical absorption properties of yttrium iron garnet (YIG) are investigated. The stoichiometry is studied by means of lattice constant measurements and the defect mechanism is discussed. From high-temperature conductivity measurements at various oxygen pressures the band-gap energy is determined to be 2.85 eV. The influence of extrinsic impurities (Pb and Si) on the electrical conductivity and the optical absorption is investigated on thin &ns grown by liquid phase epitaxy. On the basis of these results and optical work by other investigators a model for the band structure of YIG is proposed and discussed.

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“…In its middle part Fig. 1 shows experimentally observed transition energies in YIG as reported in several papers [5,6,[9][10][11][12][13][14][15]. The electronic structure of iron garnets has been a subject of calculations based on crystal field theory and molecular orbital theory [5,9,14,[16][17][18].…”

Section: Electronic Transitions In Iron Garnetsmentioning

confidence: 92%

Nonlinear optical spectroscopy of epitaxial magnetic garnet films

Павлов

Pisarev

Fiebig

et al. 2002

Low Temperature Physics

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Second and third harmonic optical spectra are studied in epitaxial magnetic thin films in the spectral ranges 1.7-3.2 eV and 2.4-4.2 eV, respectively. No significant increase of the intensity of the nonlinear spectra is found above the bandgap near 3.2 eV, where the linear absorption increases by two orders of magnitude. Large magnetic contributions to the second harmonic spectra and magnetic contrast as high as 100% are observed at selected photon energies. Contrary to that, no magnetic contribution to the third harmonic spectra is found.

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Optical properties of epitaxial iron garnet thin films

Cited by 118 publications

References 31 publications

Long-range pure magnon spin diffusion observed in a nonlocal spin-Seebeck geometry

Long-range pure magnon spin diffusion observed in a nonlocal spin-Seebeck geometry

Defects and the electronic properties of Y3Fe5O12

Nonlinear optical spectroscopy of epitaxial magnetic garnet films

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