Structure and random anisotropy in single-phase Ni nanocrystals

Eiji Kita; Naoki Tsukuhara; Hidenori Sato; Keishin Ota; Hideto Yangaihara; Hisanori Tanimoto; Naoshi Ikeda

doi:10.1063/1.2188597

Structure and random anisotropy in single-phase Ni nanocrystals

Eiji Kita, Naoki Tsukuhara, Hidenori Sato, Keishin Ota, Hideto Yangaihara, Hisanori Tanimoto, Naoshi Ikeda

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

24 Citations (Scopus)

Abstract

We prepared high-purity oxygen-free and single-phase Ni nanocrystals using the gas condensation and deposition method in order to examine the random anisotropy model (RAM). The grain size of an as-prepared sample was estimated to be 8-10 nm. Thermal annealing increased grain sizes (D) up to 22 nm. Clear D6 dependence of the coercive force on a grain size smaller than 13 nm was obtained for samples prepared on both plastic and KBr single-crystal substrates. For larger grain sizes, Hc decreased with D-1 and these results clearly conform to the RAM in single-element nanocrystal systems. A local anisotropy constant was estimated from the slope of the D6 relation and the peak of Hc at D=13 nm.

Original language	English
Article number	152501
Journal	Applied Physics Letters
Volume	88
Issue number	15
DOIs	https://doi.org/10.1063/1.2188597
Publication status	Published - Apr 10 2006
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Structure and random anisotropy in single-phase Ni nanocrystals",

abstract = "We prepared high-purity oxygen-free and single-phase Ni nanocrystals using the gas condensation and deposition method in order to examine the random anisotropy model (RAM). The grain size of an as-prepared sample was estimated to be 8-10 nm. Thermal annealing increased grain sizes (D) up to 22 nm. Clear D6 dependence of the coercive force on a grain size smaller than 13 nm was obtained for samples prepared on both plastic and KBr single-crystal substrates. For larger grain sizes, Hc decreased with D-1 and these results clearly conform to the RAM in single-element nanocrystal systems. A local anisotropy constant was estimated from the slope of the D6 relation and the peak of Hc at D=13 nm.",

author = "Eiji Kita and Naoki Tsukuhara and Hidenori Sato and Keishin Ota and Hideto Yangaihara and Hisanori Tanimoto and Naoshi Ikeda",

note = "Funding Information: The authors would like to thank Dr. H. Murakami for his help in AES and SEM measurements. This work was supported by the Center for Tsukuba Advanced Research Alliance (TARA) at the University of Tsukuba. The XRD study at SPring-8 was carried out under Contract No. 2002A-0638. This work has been partly supported by the 21st Century COE program, “Promotion of Creative Interdisciplinary Materials Science for Novel Functions” under MEXT< Japan and by the University of Tsukuba Nanoscience Special Project.",

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AU - Kita, Eiji

AU - Tsukuhara, Naoki

AU - Sato, Hidenori

AU - Ota, Keishin

AU - Yangaihara, Hideto

AU - Tanimoto, Hisanori

AU - Ikeda, Naoshi

N1 - Funding Information: The authors would like to thank Dr. H. Murakami for his help in AES and SEM measurements. This work was supported by the Center for Tsukuba Advanced Research Alliance (TARA) at the University of Tsukuba. The XRD study at SPring-8 was carried out under Contract No. 2002A-0638. This work has been partly supported by the 21st Century COE program, “Promotion of Creative Interdisciplinary Materials Science for Novel Functions” under MEXT< Japan and by the University of Tsukuba Nanoscience Special Project.

PY - 2006/4/10

Y1 - 2006/4/10

N2 - We prepared high-purity oxygen-free and single-phase Ni nanocrystals using the gas condensation and deposition method in order to examine the random anisotropy model (RAM). The grain size of an as-prepared sample was estimated to be 8-10 nm. Thermal annealing increased grain sizes (D) up to 22 nm. Clear D6 dependence of the coercive force on a grain size smaller than 13 nm was obtained for samples prepared on both plastic and KBr single-crystal substrates. For larger grain sizes, Hc decreased with D-1 and these results clearly conform to the RAM in single-element nanocrystal systems. A local anisotropy constant was estimated from the slope of the D6 relation and the peak of Hc at D=13 nm.

AB - We prepared high-purity oxygen-free and single-phase Ni nanocrystals using the gas condensation and deposition method in order to examine the random anisotropy model (RAM). The grain size of an as-prepared sample was estimated to be 8-10 nm. Thermal annealing increased grain sizes (D) up to 22 nm. Clear D6 dependence of the coercive force on a grain size smaller than 13 nm was obtained for samples prepared on both plastic and KBr single-crystal substrates. For larger grain sizes, Hc decreased with D-1 and these results clearly conform to the RAM in single-element nanocrystal systems. A local anisotropy constant was estimated from the slope of the D6 relation and the peak of Hc at D=13 nm.

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Structure and random anisotropy in single-phase Ni nanocrystals

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