Thermophysical properties of the system Al2O3 - MgO

Schulz, Brigitte; Hoffmann, Markus M.

doi:10.1068/htjr018

Cited by 27 publications

(26 citation statements)

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“…Further details on the heat flux normalization can be found in the Supplemental Materials III [30] (including Refs. [35,36]). To estimate the ANE reduction due to the additional Pt layer we used the ratio of conductances G of the NiFe 2 O x and the Pt in a parallel arrangement [14] …”

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confidence: 99%

Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal–Ferromagnet Bilayers

et al. 2017

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We identify and investigate thermal spin transport phenomena in sputter-deposited Pt/NiFe2O4-x (4 ≥ x ≥ 0) bilayers. We separate the voltage generated by the spin Seebeck effect from the anomalous Nernst effect contributions and even disentangle the intrinsic anomalous Nernst effect (ANE) in the ferromagnet (FM) from the ANE produced by the Pt that is spin polarized due to its proximity to the FM. Further, we probe the dependence of these effects on the electrical conductivity and the band gap energy of the FM film varying from nearly insulating NiFe2O4 to metallic Ni33Fe67. A proximity-induced ANE could only be identified in the metallic Pt/Ni33Fe67 bilayer in contrast to Pt/NiFe2Ox (x > 0) samples. This is verified by the investigation of static magnetic proximity effects via x-ray resonant magnetic reflectivity.In the emerging fields of spintronics Pt is employed frequently for generating and detecting pure spin currents, if adjacent to an FMI, although the possibility of magnetic proximity effects (MPEs) has to be taken into account. Due to its close vicinity to the Stoner criterion [11] the FM can potentially generate a Pt spin polarization at the interface. Consequently, this might induce additional parasitic effects preventing the correct interpretation of the measured ISHE voltage. Therefore, a comprehensive investigation regarding the magnetic properties of the NM/FM interface is required to distinguish the contributions of such parasitic voltages from the ISHE voltage generated by a pure spin current.In the case of SSE, the driving force for the spin current in the FM or FMI is a temperature gradient. When a spin current is generated parallel to a temperature gradient, it is generally attributed to the longitudinal spin Seebeck effect (LSSE) [4,5]. However, when using the ISHE in an adjacent NM for the spin current detection, not only a proximity-induced ANE [12] can contaminate the LSSE signal, but also an additional intrinsic ANE contribution could be present in case of studying ferromagnetic metals (FMMs) or semiconducting ferro(i)magnets [13,14]. Mainly NM/FMI bilayers have been investigated, while LSSE studies on NM/FMM are quite rare.However, Ramos et al. [14][15][16][17] and Wu et al. [18] individually investigated the LSSE in magnetite, which is conducting at room temperature (RT) and, thus, has an intrinsic ANE contribution. They identified the LSSE in Pt/Fe 3 O 4 [14] and CoFeB/Fe 3 O 4 bilayers [18] by using temperatures below the conductor-insulator transition of magnetite (Verwey transition at 120 K) in order to exclude any intrinsic ANE contribution. Ramos et al. further investigated the ANE in bulk magnetite without any Pt [15] and concluded that the ANE contributions for Pt/Fe 3 O 4 bilayers and multilayers should be quite small [16,17]. In addition, Lee et al. [19] and Uchida et al. [20,21] discussed that in Pt/FMM multilayers both LSSE and ANE contribute, but did not disentangle the effects quantitatively. Hence, a clear quantitative disentanglement of the LSSE in the FMM [22], the ...

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Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal–Ferromagnet Bilayers

et al. 2017

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“…Thus, the heat capacity of Np 0.25 Am 0.75 N was calculated using the additivity law from those of Np 0.50 Am 0.50 N and AmN [5]. In order to compare the thermal conductivity of the present (Np,Pu)N and (Pu,Am)N solid solutions, the data were corrected to 100%TD using the Schulz equation [17].…”

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confidence: 99%

Thermal conductivities of (Np,Am)N and (Pu,Am)N solid solutions

Nishi

Takano

Itoh

et al. 2010

IOP Conf. Ser.: Mater. Sci. Eng.

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“…For example, Schulz proposed a simple model by assuming closed spherical pores. 23) For a low porosity condition (V c ≤ 10%), the effect of porosity on the thermal conductivity of solid composites can be described as follows:…”

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confidence: 99%

“…Another reason may be that pores or cavities with different properties probably have different effects on thermal conductivity. Schulz 23) took such parameters as the shape, orientation, structure type, distribution of the pore, and porosity into consideration when he studied the thermal conductivity of porous composites. However, these factors can be neglected or simplified for the present 3Y-TZP specimens, since the deformation-induced cavities are sphere-like, very fine and distributed quite uniformly in the deformed specimens.…”

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confidence: 99%

“…Although many empirical or semiempirical correlations between thermal conductivity and porosity have been reported, they are based on some special assumptions and their ranges of applicability are limited to special situations. 14,22,23) Up to now, as long as we know, there is no report on the relationship between superplastic deformation-induced cavities and thermal conductivity. It is of interest to investigate the thermal conductivity of superplastic ceramics.…”

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confidence: 99%

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Thermal Conductivity of Superplastically Deformed 3Y-TZP

Wan

Motohashi

Shibata³

et al. 2002

Mater. Trans.

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The thermal diffusivity and specific heat of superplastically deformed 3Y-TZP specimens were measured in a temperature range from 298 to 1273 K. From these data, the thermal conductivity has been evaluated and discussed. A weak temperature dependence of the thermal conductivity was observed. The thermal conductivity showed almost no dependence on the grain size and grain aspect ratio of the 3Y-TZP specimens. On the other hand, the thermal conductivity was considerably sensitive to the deformation-induced cavities. The influence of the cavities on the thermal conductivity is related with temperature. An expression was proposed for predicting the relationship between the effective thermal conductivity and deformation-induced cavities within the present experimental range.

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Thermophysical properties of the system Al2O3 - MgO

Cited by 27 publications

References 0 publications

Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal–Ferromagnet Bilayers

Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal–Ferromagnet Bilayers

Thermal conductivities of (Np,Am)N and (Pu,Am)N solid solutions

Thermal Conductivity of Superplastically Deformed 3Y-TZP

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