Spin-dependent band structure, Fermi surface, and carrier lifetime of permalloy

Petrovykh, Dmitri Y.; Altmann, K. N.; Höchst, H.; Laubscher, Markus; Maat, S.; Mankey, G. J.; Himpsel, F. J.

doi:10.1063/1.122796

Cited by 113 publications

(89 citation statements)

References 28 publications

(9 reference statements)

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“…Additional experiments can provide insight about the magnitude of the individual contributions P I , λ F . Angle-resolved photoemission provides information about the relaxation length λ F of ferromagnets 44 (albeit high in the energy band), while the conductance polarization of ferromagnets P I can be investigated by measuring the Doppler shift of spin-waves. 45 Although the model fits the observed spin-valve signals of devices with clean interfaces very well, 34 in lateral systems the model often overestimates the observable spin-valve signals.…”

Section: Spin Transportmentioning

confidence: 99%

Modeling of thermal spin transport and spin-orbit effects in ferromagnetic/nonmagnetic mesoscopic devices

2011

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Section: Spin Transportmentioning

confidence: 99%

Modeling of thermal spin transport and spin-orbit effects in ferromagnetic/nonmagnetic mesoscopic devices

2011

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“…The Fermi velocity υ F for bulk cobalt was taken from [18], and r is the radius of the particle (r = 75 nm). Interband dielectric constants were calculated from (7).…”

Section: Preparation Of Samplesmentioning

confidence: 99%

Evaluation of Optical Properties of Ag, Cu, and Co Nanoparticles Synthesized in Organic Medium

Kaminskienė¹,

Prosyčevas²,

Stonkutė

et al. 2013

Acta Phys. Pol. A

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The surface plasmon resonance evaluation of colloidal metal nanoparticles, synthesized in organic medium, is reported in this work. Metal salts were dissolved in dioxane/AOT solution and reduced by hydrazine hydrate under vigorous stirring. Optical properties of obtained colloidal nanoparticles were investigated by UV VIS spectroscopy. Theoretical predictions of optical properties of metal nanoparticles were made by means of the Mie theory and the Drude free-electron model. Geometrical parameters and distribution of metal nanoparticles in colloidal solutions were characterized by atomic force microscopy. The results show that Ag, Cu, and Co nanoparticles, synthesized in organic medium distinguish plasmonic properties. Surface plasmon resonance bands were obtained in all cases: Ag at 430 nm, Cu at 570 nm, Co at 350 nm (SPR1) and 430 nm (SPR2). Comparing theoretical evaluation of nanoparticles size with atomic force microscopy analysis, we can assume that our calculations are accurate. It was found that dominating nanoparticles diameter in Ag colloidal solution is ≈ 150 nm, in Cu colloidal solution is ≈ 70 80 nm and in Co colloidal solution is ≈ 150 nm. It can be concluded that nanoparticles with enhanced plasmonic properties synthesized in organic medium can be widely used in order to increase e ciency of various optical elements.

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“…A Fermi sphere reasonably approximates Fermi surfaces of the alkali and noble metals 4 and Ca. 84 Band structure calculations, including evaluation of angle-resolved photoemission experiments, 85 give u Fermi ∼ 0.3×10 6 m·s −1 for Ti, Ni, Co, and the Fe-Ni alloy permalloy, which is a factor of ∼4 lower than that associated with Fermi spheres for these elements. However, even with a four fold increase, calculated mean free paths remain significantly below interatomic distances.…”

mentioning

confidence: 99%

Isolating lattice from electronic contributions in thermal transport measurements of metals and alloys above ambient temperature and an adiabatic model

Criss

Hofmeister²

2017

Int. J. Mod. Phys. B

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From femtosecond spectroscopy (fs-spectroscopy) of metals, electrons and phonons reequilibrate nearly independently, which contrasts with models of heat transfer at ordinary temperatures (T > 100 K). These electronic transfer models only agree with thermal conductivity (k) data at a single temperature, but do not agree with thermal diffusivity (D) data. To address the discrepancies, which are important to problems in solid state physics, we separately measured electronic (ele) and phononic (lat) components of D in many metals and alloys over ∼290-1100 K by varying measurement duration and sample length in laser-flash experiments. These mechanisms produce distinct diffusive responses in temperature versus time acquisitions because carrier speeds (u) and heat capacities (C) differ greatly. Electronic transport of heat only operates for a brief time after heat is applied because u is high. High D ele is associated with moderate T , long lengths, low electrical resistivity, and loss of ferromagnetism. Relationships of D ele and D lat with physical properties support our assignments. Although k ele reaches ∼20 × k lat near 470 K, it is transient. Combining previous data on u with each D This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the https://creativecommons.org/licenses/by/4.0Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited. * E. M. Criss is an employee of Panasonic Avionics Corporation, but prepared this paper independent of his employment and without use of information, resources, or other support from Panasonic Avionics Corporation.† Corresponding author. provides mean free paths and lifetimes that are consistent with ∼298 K fs-spectroscopy, and new values at high T . Our findings are consistent with nearly-free electrons absorbing and transmitting a small fraction of the incoming heat, whereas phonons absorb and transmit the majority. We model time-dependent, parallel heat transfer under adiabatic conditions which is one-dimensional in solids, as required by thermodynamic law. For noninteracting mechanisms, k ∼ = ΣC i k i ΣC i /(ΣC 2 i ). For metals, this reduces to k = k lat above ∼20 K, consistent with our measurements, and shows that Meissner's equation (k ∼ = k lat + k ele ) is invalid above ∼20 K. For one mechanism with multiple, interacting carriers, k ∼ = ΣC i k i /(ΣC i ). Thus, certain dynamic behaviors of electrons and phonons in metals have been misunderstood. Implications for theoretical models and technological advancements are briefly discussed.

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Spin-dependent band structure, Fermi surface, and carrier lifetime of permalloy

Cited by 113 publications

References 28 publications

Modeling of thermal spin transport and spin-orbit effects in ferromagnetic/nonmagnetic mesoscopic devices

Modeling of thermal spin transport and spin-orbit effects in ferromagnetic/nonmagnetic mesoscopic devices

Evaluation of Optical Properties of Ag, Cu, and Co Nanoparticles Synthesized in Organic Medium

Isolating lattice from electronic contributions in thermal transport measurements of metals and alloys above ambient temperature and an adiabatic model

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