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Gilleo, M. A.; Geller, S.

doi:10.1103/physrev.110.73

Cited by 366 publications

(106 citation statements)

References 12 publications

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“…For the ground state (L = 0, J = 1/2) the Landé g-factor is g = g S ≈ 2 as given by the Landé equation, which results in γ = 1.759x10 11 C/kg for the free electron.…”

Section: Equationmentioning

confidence: 99%

“…For simplicity, only an octant of a garnet structure that shows just the cation positions is shown in Figure 8. The garnet structure is composed of a combination of octahedral 11 as shown in Figure 9. In contrast to the spinel ferrites, which have two types of crystallographic sites as will be described below, the garnet structure has three types of lattice sites available to metallic ions.…”

Section: Equationmentioning

confidence: 99%

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Microwave ferrites, part 1: fundamental properties

Özgür

Alivov

Morkoç̌

2009

J Mater Sci: Mater Electron

320

110

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Ferrimagnets having low RF loss are used in passive microwave components such as isolators, circulators, phase shifters, and miniature antennas operating in a wide range of frequencies (1-100 GHz) and as magnetic recording media owing to their novel physical properties. Frequency tuning of these components has so far been obtained by external magnetic fields provided by a permanent magnet or by passing current through coils. However, for high frequency operation the permanent part of magnetic bias should be as high as possible, which requires large permanent magnets resulting in relatively large size and high cost microwave passive components. A promising approach to circumvent this problem is to use hexaferrites, such as BaFe 12 O 19 and SrFe 12 O 19 , which have high effective internal magnetic anisotropy that also contributes to the permanent bias.Such a self-biased material remains magnetized even after removing the external applied magnetic field, and thus, may not even require an external permanent i

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“…For the ground state (L = 0, J = 1/2) the Landé g-factor is g = g S ≈ 2 as given by the Landé equation, which results in γ = 1.759x10 11 C/kg for the free electron.…”

Section: Equationmentioning

confidence: 99%

Section: Equationmentioning

confidence: 99%

Microwave ferrites, part 1: fundamental properties

Özgür

Alivov

Morkoç̌

2009

J Mater Sci: Mater Electron

320

110

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show abstract

“…(These have not been obtained as yet for any of the rare earth ions smaller than Gd.) The iron garnets of the trivalent ions of Sm, Eu, Gd and Y were carefully prepared in ceramic form by a method described elsewhere (Gilleo & Geller, 1958). The lattice constants of these specimens are listed in Table 1 ; listed also are those given by Bertaut & Forrat (1957).…”

Section: Short Communicationsmentioning

confidence: 99%

Rare earth radii in the iron garnets

Geller¹,

Mitchell²

1959

Acta Crystallogr

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“…In contrast, for μm thick films, a characteristic rise time was found, and a finite magnon propagation length of the order of several 100 nm was put forward as a possible explanation [16,17]. This clearly calls for study to reveal the origin of this discrepancy as it underlies the fundamental mechanism of the SSE and to determine the intrinsic length scale.To clarify the origin of the measured SSE signals, we present a detailed study of the relevant length scales of the longitudinal SSE (LSSE) covering the full range from nm to μm thick Y 3 Fe 5 O 12 [18,19] samples covered by platinum (YIG/Pt). By varying the thickness of the ferrimagnetic insulator and careful control of the interface quality, we are able to detect a characteristic feature of the SSE: Our results show an increasing and saturating SSE signal with increasing YIG film thickness.…”

mentioning

confidence: 99%

“…To clarify the origin of the measured SSE signals, we present a detailed study of the relevant length scales of the longitudinal SSE (LSSE) covering the full range from nm to μm thick Y 3 Fe 5 O 12 [18,19] samples covered by platinum (YIG/Pt). By varying the thickness of the ferrimagnetic insulator and careful control of the interface quality, we are able to detect a characteristic feature of the SSE: Our results show an increasing and saturating SSE signal with increasing YIG film thickness.…”

mentioning

confidence: 99%

Length Scale of the Spin Seebeck Effect

et al. 2015

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We investigate the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50 μm at room temperature and 50 K. Our results reveal a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature. The observed behavior cannot be explained as an interface effect or by variations of the material parameters. Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length. This allows us to trace the origin of the observed signals to genuine bulk magnonic spin currents due to the spin Seebeck effect ruling out an interface origin and allowing us to gauge the reach of thermally excited magnons in this system for different temperatures. At low temperature, even quantitative agreement with the simulations is found. The thermal excitation of a spin current by a temperature gradient is commonly called the spin Seebeck effect (SSE) which is detected by the inverse spin Hall effect (ISHE) [1,2], leading to a thermovoltage similar to the charge analogue, the Seebeck effect. Experimental evidence of the SSE, first in ferromagnetic metals [3], and later, both in semiconductors [4] and in insulators [5][6][7][8], has brought up the question about the origin of the SSE. Of particular interest for spin caloritronics is the observation of the SSE in insulators, which allows us to generate pure spin currents in insulating systems.However, the underlying mechanism, properties, and the origin of the observed signals have been highly controversial. Thermally induced magnonic spin currents have been suggested as the origin [9,10], based on the presence of the effect in magnetic insulators, which excludes charge currents as the source. Despite this explanation of the origin of the effect, direct experimental evidence has not been reported. While parasitic interface effects [11] were suggested as an alternative source of the SSE due to a polarization of the paramagnetic detector layer [12], generally, the observed effects are now primarily attributed to magnonic spin currents [13,14].Time resolved experiments trying to address the problem by probing the temporal evolution of the SSE have obtained contradictory results: For film thickness up to 61 nm, no cut-off frequency due to an intrinsic limitation by the SSE was observed [15]. In contrast, for μm thick films, a characteristic rise time was found, and a finite magnon propagation length of the order of several 100 nm was put forward as a possible explanation [16,17]. This clearly calls for study to reveal the origin of this discrepancy as it underlies the fundamental mechanism of the SSE and to determine the intrinsic length scale.To clarify the origin of the measured SSE signals, we present a detailed study of the relevant length scales of the longitudinal SSE (LSSE) coveri...

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Magnetic and Crystallographic Properties of Substituted Yttrium-Iron Garnet,3Y2O3·x

Cited by 366 publications

References 12 publications

Microwave ferrites, part 1: fundamental properties

Microwave ferrites, part 1: fundamental properties

Rare earth radii in the iron garnets

Length Scale of the Spin Seebeck Effect

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