A simple formulation for magnetoresistance in metal-insulator granular films with increased current
dc.contributor.author | Boff, Marco Aurelio Silveira | pt_BR |
dc.contributor.author | Canto, B. | pt_BR |
dc.contributor.author | Baibich, Mario Norberto | pt_BR |
dc.contributor.author | Pereira, Luis Gustavo | pt_BR |
dc.date.accessioned | 2014-06-13T02:07:49Z | pt_BR |
dc.date.issued | 2013 | pt_BR |
dc.identifier.issn | 0021-8979 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/96577 | pt_BR |
dc.description.abstract | We studied the tunnel magnetoresistance in metal/insulator granular films when the applied current is varied. The tunnel magnetoresistance shows a strong modification related to a non-Ohmic behaviour of theses materials. It was verified that spin-dependent tunnelling is the main mechanism for magnetoresistance at low applied current. However, when the current is high, another mechanism gets to be important: it is independent of the magnetization and is associated to variable range hopping between metallic grains. In this work, we propose a simple modification of Inoue and Maekawa’s model for tunnelling magnetoresistance in granulars, rewriting the expression for resistance as a function of magnetic field and temperature, also taking into account the two different contributions. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Journal of applied physics. New York. Vol. 113, no. 7 (Feb. 2013), 073911, 4 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Magnetização | pt_BR |
dc.subject | Magnetorresistência de tunelamento | pt_BR |
dc.subject | Transporte de spin polarizado | pt_BR |
dc.subject | Filmes finos magneticos | pt_BR |
dc.subject | Materiais granulares | pt_BR |
dc.subject | Condução por salto | pt_BR |
dc.title | A simple formulation for magnetoresistance in metal-insulator granular films with increased current | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000903238 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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