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Determination of Crystal Growth Geometry Factors and Nucleation Site Densities of Electrodeposited Ferromagnetic Cobalt Nanowire Arrays
http://hdl.handle.net/10069/39183
http://hdl.handle.net/10069/39183b30235f6-0382-416a-982c-71b0fae17520
名前 / ファイル | ライセンス | アクション |
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Crystals9_142.pdf (7.3 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-05-23 | |||||
タイトル | ||||||
タイトル | Determination of Crystal Growth Geometry Factors and Nucleation Site Densities of Electrodeposited Ferromagnetic Cobalt Nanowire Arrays | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Johnson?Mehl?Avrami?Kolmogorov (JMAK) theory | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | electrodeposition | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | cobalt | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | nanowire array | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | crystal growth geometry | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | nucleation site density | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | crystal orientation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | uniaxial magnetization | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Saeki, Ryusei
× Saeki, Ryusei× Ohgai, Takeshi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The time-dependence of electrochemical reduction current, which was observed during the one-dimensional (1-D) crystal growth of ferromagnetic cobalt nanowire arrays, was analyzed by Johnson?Mehl?Avrami?Kolmogorov (JMAK) theory. Textured hcp-Co nanowire arrays were synthesized by potentio-static electrochemical reduction of Co 2+ ions in anodized aluminum oxide (AAO) nanochannel films. Crystal growth geometry factor n in the JMAK equation was determined to be ca. 1. Hence, the electrochemical crystal growth process of a numerical nanowires array can be explained by 1-D geometry. The crystal nucleation frequency factor, k in JMAK equation was estimated to be the range between 10 ?4 and 10 ?3 . Our experimental results revealed that the crystal nucleation site density N d increased up to 2.7 × 10 ?8 nm ?3 when increasing the overpotential for cobalt electrodeposition by shifting the cathode potential down to ?0.85 V vs. Ag/AgCl. The (002) crystal orientation of hcp-Co nanowire arrays was, remarkably, observed by decreasing N d . Spontaneous magnetization behavior was observed in the axial direction of nanowires. By decreasing the overpotential for cobalt electrodeposition, the coercivity of the nanocomposite film increased and reached up to 1.88 kOe, with a squareness of ca. 0.9 at room temperature. |
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書誌情報 |
Crystals 巻 9, 号 3, p. 142, 発行日 2019-03-10 |
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出版者 | ||||||
出版者 | MDPI AG | |||||
EISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 20734352 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.3390/cryst9030142 | |||||
権利 | ||||||
権利情報 | c 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Crystals, 9(3), art.no.142; 2019 |