Intrinsic spin noise in MgO magnetic tunnel junctions
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Título: | Intrinsic spin noise in MgO magnetic tunnel junctions |
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Autor/es: | Delgado Acosta, Fernando | Lopez, K. | Ferreira, R. | Fernández-Rossier, Joaquín |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Spin noise | Magnetic field sensors | MgO magnetic tunnel junctions |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 11-feb-2013 |
Editor: | American Institute of Physics |
Cita bibliográfica: | Appl. Phys. Lett. 2013, 102: 063102. doi:10.1063/1.4791594 |
Resumen: | We consider two intrinsic sources of noise in ultra-sensitive magnetic field sensors based on MgO magnetic tunnel junctions, coming both from 25 Mg nuclear spins (I = 5/2, 10% natural abundance) and S = 1 Mg-vacancies. While nuclear spins induce noise peaked in the MHz frequency range, the vacancies noise peaks in the GHz range. We find that the nuclear noise in submicron devices has a similar magnitude than the 1/f noise, while the vacancy-induced noise dominates in the GHz range. Interestingly, the noise spectrum under a finite magnetic field gradient may provide spatial information about the spins in the MgO layer. |
Patrocinador/es: | This work has been financially supported by MEC-Spain (Grant Nos. FIS2010-21883-C02-01, FIS2009-08744, European Union, and CONSOLIDER CSD2007-0010) as well as Generalitat Valenciana, Grant Prometeo 2012-11. |
URI: | http://hdl.handle.net/10045/33598 |
ISSN: | 0003-6951 (Print) | 1077-3118 (Online) |
DOI: | 10.1063/1.4791594 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1063/1.4791594 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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