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Title | Visualization of Spin Polarized States in Biologically-Produced Ensembles of Ferromagnetic Palladium Nanoparticles |
Authors |
Mikheenko, I.
Mikheenko, P. Jenkins, P. Attard, G.A. Macaskie, L.E. Johansen, T.H. |
ORCID | |
Keywords |
Nanoparticles Palladium Ferromagnetic Bacteria Magneto-Optical Imaging Spin Injection |
Type | Conference Papers |
Date of Issue | 2012 |
URI | http://essuir.sumdu.edu.ua/handle/123456789/35337 |
Publisher | Sumy State University |
License | |
Citation | Visualization of Spin Polarized States in Biologically-Produced Ensembles of Ferromagnetic Palladium Nanoparticles / I. Mikheenko, P. Mikheenko, P. Jenkins et al. // Nanomaterials: Applications & Properties (NAP-2012) : 2-nd International conference, Alushta, the Crimea, September 17-22, 2012 / Edited by: A. Pogrebnjak. - Sumy : Sumy State University, 2012. - V. 1, No4. - 04MFPN03 |
Abstract |
We report visualization of spin polarized states in macroscopic ensembles of biologically-produced
ferromagnetic palladium nanoparticles using the Faraday effect-based technique of magneto-optical
imaging. The ferromagnetic palladium only exists in the form of nanoparticles. Large quantities of
palladium nanoparticles may be synthesized via biomineralization from a Pd2+ solution. The ferromagnetic
Pd nanoparticles are formed in the periplasmic space of bacteria during the hydrogen-assisted reduction of
Pd2+ ions by hydrogenases. The ferromagnetism in Pd comes from itinerant electrons. A high Curie
temperature of ferromagnetic palladium, about 200 degrees centigrade above room temperature, would
allow for a range of room-temperature magnetic applications. The processes of the isolation of electron
spins in separate nanoparticles, spin hopping, spin transport and spin correlations may even form a basis
of quantum computing. So far, measurements of the magnetic properties of Pd nanoparticles (PdNP) have
been limited by integral techniques such as SQUID magnetometry, magnetic circular dihroism and muon
spin rotation spectroscopy ( SR). In the present study, ferromagnetic Pd nanoparticles are characterized
using the technique of magneto-optical imaging. This allows visualization of the spin polarization by the
variations in the intensity of polarized light. To perform measurements at relatively low magnetic fields, a
spin injection from a colossal magnetoresistive material has been used.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35337 |
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