Room temperature ferromagnetism and hopping conduction in Pt NCs/Al 2O3 films

Y. W. Ma; J. Ding; J. B. Yi; Lap Chan; T. S. Herng; Stella Huang; M. Ran

doi:10.1063/1.3562872

Room temperature ferromagnetism and hopping conduction in Pt NCs/Al ₂O₃ films

Y. W. Ma, J. Ding, J. B. Yi, Lap Chan, T. S. Herng, Stella Huang, M. Ran

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

1 Scopus citations

Abstract

In this work, Pt nanocrystals (NCs) were embedded into different oxide films by codeposition of Pt and oxide at 400 C and 10^-8 Torr using a pulse laser deposition system. Films of Pt (25 mol. ) NCs embedded in (Al ₂O₃, ZnO, or SnO₂) matrix showed room temperature ferromagnetism (RTFM), while Pt (25 mol. ) NCs/(MgO or SiO ₂) films were not magnetic. The detailed study of Pt NCs/Al ₂O₃ films with different concentrations of Pt revealed that RTFM depended on Pt NC size and conductivity of the film. Resistance-temperature study of this film showed that the hopping conduction may be associated with RTFM.

Original language	English
Article number	07C321
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3562872
State	Published - 1 Apr 2011
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1063/1.3562872

Cite this

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title = "Room temperature ferromagnetism and hopping conduction in Pt NCs/Al 2O3 films",

abstract = "In this work, Pt nanocrystals (NCs) were embedded into different oxide films by codeposition of Pt and oxide at 400 C and 10-8 Torr using a pulse laser deposition system. Films of Pt (25 mol. ) NCs embedded in (Al 2O3, ZnO, or SnO2) matrix showed room temperature ferromagnetism (RTFM), while Pt (25 mol. ) NCs/(MgO or SiO 2) films were not magnetic. The detailed study of Pt NCs/Al 2O3 films with different concentrations of Pt revealed that RTFM depended on Pt NC size and conductivity of the film. Resistance-temperature study of this film showed that the hopping conduction may be associated with RTFM.",

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T1 - Room temperature ferromagnetism and hopping conduction in Pt NCs/Al 2O3 films

AU - Ma, Y. W.

AU - Ding, J.

AU - Yi, J. B.

AU - Chan, Lap

AU - Herng, T. S.

AU - Huang, Stella

AU - Ran, M.

PY - 2011/4/1

Y1 - 2011/4/1

N2 - In this work, Pt nanocrystals (NCs) were embedded into different oxide films by codeposition of Pt and oxide at 400 C and 10-8 Torr using a pulse laser deposition system. Films of Pt (25 mol. ) NCs embedded in (Al 2O3, ZnO, or SnO2) matrix showed room temperature ferromagnetism (RTFM), while Pt (25 mol. ) NCs/(MgO or SiO 2) films were not magnetic. The detailed study of Pt NCs/Al 2O3 films with different concentrations of Pt revealed that RTFM depended on Pt NC size and conductivity of the film. Resistance-temperature study of this film showed that the hopping conduction may be associated with RTFM.

AB - In this work, Pt nanocrystals (NCs) were embedded into different oxide films by codeposition of Pt and oxide at 400 C and 10-8 Torr using a pulse laser deposition system. Films of Pt (25 mol. ) NCs embedded in (Al 2O3, ZnO, or SnO2) matrix showed room temperature ferromagnetism (RTFM), while Pt (25 mol. ) NCs/(MgO or SiO 2) films were not magnetic. The detailed study of Pt NCs/Al 2O3 films with different concentrations of Pt revealed that RTFM depended on Pt NC size and conductivity of the film. Resistance-temperature study of this film showed that the hopping conduction may be associated with RTFM.

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