Intrinsic spin noise in MgO magnetic tunnel junctions
| Contribuinte(s) |
Universidad de Alicante. Departamento de Física Aplicada Grupo de Nanofísica |
|---|---|
| Data(s) |
31/10/2013
31/10/2013
11/02/2013
|
| Resumo |
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. 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. |
| Identificador |
Appl. Phys. Lett. 2013, 102: 063102. doi:10.1063/1.4791594 0003-6951 (Print) 1077-3118 (Online) http://hdl.handle.net/10045/33598 10.1063/1.4791594 |
| Idioma(s) |
eng |
| Publicador |
American Institute of Physics |
| Relação |
http://dx.doi.org/10.1063/1.4791594 |
| Direitos |
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. info:eu-repo/semantics/openAccess |
| Palavras-Chave | #Spin noise #Magnetic field sensors #MgO magnetic tunnel junctions #Física de la Materia Condensada |
| Tipo |
info:eu-repo/semantics/article |
