Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon

A. A. Baker; L. B.Bayu Aji; J. H. Bae; E. Stavrou; D. J. Steich; S. K. McCall; S. O. Kucheyev

doi:10.1088/1361-6668/aab4eb

Vapor annealing synthesis of non-epitaxial MgB₂ films on glassy carbon

A. A. Baker, L. B.Bayu Aji, J. H. Bae, E. Stavrou, D. J. Steich, S. K. McCall, S. O. Kucheyev

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

We describe the fabrication and characterization of 25-800 nm thick MgB₂ films on glassy carbon substrates by Mg vapor annealing of sputter-deposited amorphous B films. Results demonstrate a critical role of both the initial B film thickness and the temperature-time profile on the microstructure, elemental composition, and superconducting properties of the resultant MgB₂ films. Films with thicknesses of 55 nm and below exhibit a smooth surface, with a roughness of 1.1 nm, while thicker films have surface morphology consisting of elongated nano-crystallites. The suppression of the superconducting transition temperature for thin films scales linearly with the oxygen impurity concentration and also correlates with the amount of lattice disorder probed by Raman scattering. The best results are obtained by a rapid (12 min) anneal at 850 °C with large temperature ramp and cooling rates of ∼540 °C min^-1. Such fast processing suppresses the deleterious oxygen uptake.

Original language	English
Article number	055006
Journal	Superconductor Science and Technology
Volume	31
Issue number	5
DOIs	https://doi.org/10.1088/1361-6668/aab4eb
State	Published - 29 Mar 2018
Externally published	Yes

Keywords

MgB
levitation
superconductivity
thin film

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10.1088/1361-6668/aab4eb

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title = "Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon",

abstract = "We describe the fabrication and characterization of 25-800 nm thick MgB2 films on glassy carbon substrates by Mg vapor annealing of sputter-deposited amorphous B films. Results demonstrate a critical role of both the initial B film thickness and the temperature-time profile on the microstructure, elemental composition, and superconducting properties of the resultant MgB2 films. Films with thicknesses of 55 nm and below exhibit a smooth surface, with a roughness of 1.1 nm, while thicker films have surface morphology consisting of elongated nano-crystallites. The suppression of the superconducting transition temperature for thin films scales linearly with the oxygen impurity concentration and also correlates with the amount of lattice disorder probed by Raman scattering. The best results are obtained by a rapid (12 min) anneal at 850 °C with large temperature ramp and cooling rates of ∼540 °C min-1. Such fast processing suppresses the deleterious oxygen uptake.",

keywords = "MgB, levitation, superconductivity, thin film",

author = "Baker, {A. A.} and Aji, {L. B.Bayu} and Bae, {J. H.} and E. Stavrou and Steich, {D. J.} and McCall, {S. K.} and Kucheyev, {S. O.}",

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year = "2018",

month = mar,

day = "29",

doi = "10.1088/1361-6668/aab4eb",

language = "英语",

volume = "31",

journal = "Superconductor Science and Technology",

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T1 - Vapor annealing synthesis of non-epitaxial MgB2 films on glassy carbon

AU - Baker, A. A.

AU - Aji, L. B.Bayu

AU - Bae, J. H.

AU - Stavrou, E.

AU - Steich, D. J.

AU - McCall, S. K.

AU - Kucheyev, S. O.

PY - 2018/3/29

Y1 - 2018/3/29

N2 - We describe the fabrication and characterization of 25-800 nm thick MgB2 films on glassy carbon substrates by Mg vapor annealing of sputter-deposited amorphous B films. Results demonstrate a critical role of both the initial B film thickness and the temperature-time profile on the microstructure, elemental composition, and superconducting properties of the resultant MgB2 films. Films with thicknesses of 55 nm and below exhibit a smooth surface, with a roughness of 1.1 nm, while thicker films have surface morphology consisting of elongated nano-crystallites. The suppression of the superconducting transition temperature for thin films scales linearly with the oxygen impurity concentration and also correlates with the amount of lattice disorder probed by Raman scattering. The best results are obtained by a rapid (12 min) anneal at 850 °C with large temperature ramp and cooling rates of ∼540 °C min-1. Such fast processing suppresses the deleterious oxygen uptake.

AB - We describe the fabrication and characterization of 25-800 nm thick MgB2 films on glassy carbon substrates by Mg vapor annealing of sputter-deposited amorphous B films. Results demonstrate a critical role of both the initial B film thickness and the temperature-time profile on the microstructure, elemental composition, and superconducting properties of the resultant MgB2 films. Films with thicknesses of 55 nm and below exhibit a smooth surface, with a roughness of 1.1 nm, while thicker films have surface morphology consisting of elongated nano-crystallites. The suppression of the superconducting transition temperature for thin films scales linearly with the oxygen impurity concentration and also correlates with the amount of lattice disorder probed by Raman scattering. The best results are obtained by a rapid (12 min) anneal at 850 °C with large temperature ramp and cooling rates of ∼540 °C min-1. Such fast processing suppresses the deleterious oxygen uptake.

KW - MgB

KW - levitation

KW - superconductivity

KW - thin film

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U2 - 10.1088/1361-6668/aab4eb

DO - 10.1088/1361-6668/aab4eb

M3 - 文章

AN - SCOPUS:85045837409

SN - 0953-2048

VL - 31

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 5

M1 - 055006

ER -

Vapor annealing synthesis of non-epitaxial MgB₂ films on glassy carbon

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Keywords

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