DSpace Repository

The Effect of Size, Shape and Environment on Magnetic Properties of a Nanoparticle: microscopic model analysis

Show simple item record

dc.contributor.author COJOCARU, Sergiu
dc.contributor.author DOHOTARU, Leonid
dc.contributor.author MOSCALENCO, Vsevolod
dc.date.accessioned 2019-10-07T11:11:00Z
dc.date.available 2019-10-07T11:11:00Z
dc.date.issued 2013
dc.identifier.citation COJOCARU, Sergiu, DOHOTARU, Leonid, MOSCALENCO, Vsevolod. The Effect of Size, Shape and Environment on Magnetic Properties of a Nanoparticle: microscopic model analysis. In: ICNBME-2013. International Conference on Nanotechnologies and Biomedical Engineering. German-Moldovan Workshop on Novel Nanomaterials for Electronic, Photonic and Biomedical Applications: proc. of the 2th intern. conf., April 18-20, 2013. Chişinău, 2013, pp. 322-325. ISBN 978-9975-62-343-8. en_US
dc.identifier.isbn 978-9975-62-343-8
dc.identifier.uri http://repository.utm.md/handle/5014/4630
dc.description.abstract Our theoretical study of magnetic nanoparticles is based on an original analytic approach, which allows to track down the intrinsic mechanisms of the observed magnetic properties. In particular, it reveals some misleading aspects of the standard phenomenological description of ferromagnetic nanoparticles. We show that quantum effects become important for particle size below 50 nm even at high temperatures. Several new results are relevant for controlling magnetization in nanostructures. Thus, the theory predicts that dividing a nanoparticle in two pieces may enhance and even generate a spontaneous magnetization. The effect grows nonlinearly with smaller size and is especially large for structures with anisotropic shape. Generally, at a given temperature and given number of atoms nanoparticles of a more isotropic shape have a larger polarization. However, coupling to environment strongly affects the magnetization: for a free-standing particle it is progressively suppressed for smaller sizes while for a particle with surface spins pinned by the coupling this trend is reversed. Due to this boundary induced polarization mechanism the Curie temperature Tc in the latter case may be several times larger. Moreover, anisotropic structures are much more sensitive to the environment than the isotropic ones: e.g., placing a free-standing nanorod into an appropriate environment may lead to an abrupt increase in its magnetization, which can be larger than that of a cubic particle of the same volume. en_US
dc.language.iso en en_US
dc.publisher Technical University of Moldova en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject magnetic nanoparticles en_US
dc.subject anisotropy en_US
dc.subject quantum effects en_US
dc.subject nanoparticule magnetice en_US
dc.subject anizotropie en_US
dc.subject efecte cuantice en_US
dc.title The Effect of Size, Shape and Environment on Magnetic Properties of a Nanoparticle: microscopic model analysis en_US
dc.type Article en_US


Files in this item

The following license files are associated with this item:

This item appears in the following Collection(s)

Show simple item record

Attribution-NonCommercial-NoDerivs 3.0 United States Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 United States

Search DSpace


Advanced Search

Browse

My Account