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Tuning properties of nanoporous Au-Fe alloys by electrochemically induced surface charge variations

Mishra, A. K. ; Bansal, C. ; Ghafari, M. ; Kruk, R. ; Hahn, H. (2010):
Tuning properties of nanoporous Au-Fe alloys by electrochemically induced surface charge variations.
In: Physical Review B, 81 (15), pp. 155452-1-155452-7. American Physical Society, ISSN 1098-0121,
[Article]

Abstract

The behavior of strain, magnetization, and resistivity of a nanoporous Au0.55Fe0.45 alloy was studied in situ during electrochemically induced charge variations on the surface of the alloy. The length of the sample varied reversibly over several cycles of charging and decharging and a maximum fractional length change of 0.14 percent was observed for an induced surface charge of 15 micro-Coulombs/cm2. The change in magnetization with induced surface charge was dependent on the applied magnetic field and a reversible variation in magnetization of 0.2 percent was observed at the highest applied magnetic field of 6 Tesla. The electrical conductivity could be reversibly changed by 2.5 percent due to the charge induced on the sample. In situ Mössbauer spectra recorded during charging and decharging also showed a systematic variation in quadrupole splitting. An attempt is made to explain the observed changes in physical properties quantitatively in terms of the additional charge that is accumulated on the surface of the nanoporous system.

Item Type: Article
Erschienen: 2010
Creators: Mishra, A. K. ; Bansal, C. ; Ghafari, M. ; Kruk, R. ; Hahn, H.
Title: Tuning properties of nanoporous Au-Fe alloys by electrochemically induced surface charge variations
Language: English
Abstract:

The behavior of strain, magnetization, and resistivity of a nanoporous Au0.55Fe0.45 alloy was studied in situ during electrochemically induced charge variations on the surface of the alloy. The length of the sample varied reversibly over several cycles of charging and decharging and a maximum fractional length change of 0.14 percent was observed for an induced surface charge of 15 micro-Coulombs/cm2. The change in magnetization with induced surface charge was dependent on the applied magnetic field and a reversible variation in magnetization of 0.2 percent was observed at the highest applied magnetic field of 6 Tesla. The electrical conductivity could be reversibly changed by 2.5 percent due to the charge induced on the sample. In situ Mössbauer spectra recorded during charging and decharging also showed a systematic variation in quadrupole splitting. An attempt is made to explain the observed changes in physical properties quantitatively in terms of the additional charge that is accumulated on the surface of the nanoporous system.

Journal or Publication Title: Physical Review B
Volume of the journal: 81
Issue Number: 15
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Feb 2013 10:04
URL / URN: http://dx.doi.org/10.1103/PhysRevB.81.155452
Identification Number: doi:10.1103/PhysRevB.81.155452
Funders: The financial support of the DST �India�-DAAD �Germany� project based personnel exchange program and of the Deutsche Forschungsgemeinschaft �DFG� is acknowledged.
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