Joule heating in ferromagnetic nanostripes with a notch

Ramos, Eduardo and López López, Cristina and Akerman, Johanna and Muñoz, Manuel and Prieto Martin, Jose Luis (2015). Joule heating in ferromagnetic nanostripes with a notch. "Physical Review B", v. 91 ; pp.. ISSN 1098-0121.


Title: Joule heating in ferromagnetic nanostripes with a notch
  • Ramos, Eduardo
  • López López, Cristina
  • Akerman, Johanna
  • Muñoz, Manuel
  • Prieto Martin, Jose Luis
Item Type: Article
Título de Revista/Publicación: Physical Review B
Date: June 2015
Volume: 91
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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The temperature in a ferromagnetic nanostripe with a notch subject to Joule heating has been studied in detail. We first performed an experimental real-time calibration of the temperature versus time as a 100 ns current pulse was injected into a Permalloy nanostripe. This calibration was repeated for different pulse amplitudes and stripe dimensions and the set of experimental curves were fitted with a computer simulation using the Fourier thermal conduction equation. The best fit of these experimental curves was obtained by including the temperature-dependent behavior of the electrical resistivity of the Permalloy and of the thermal conductivity of thesubstrate(SiO2). Notably, a nonzero interface thermal resistance between the metallic nanostripe and thesubstrate was also necessary to fit the experimental curves. We found this parameter pivotal to understand ourresults and the results from previous works. The higher current density in the notch, together with the interface thermal resistance, allows a considerable increase of the temperature in the notch, creating a large horizontal thermal gradient. This gradient, together with the high temperature in the notch and the larger current density close to the edges of the notch, can be very influential in experiments studying the current assisted domain wall motion.

Funding Projects

Government of SpainMAT2011-28532-C03-03UnspecifiedUnspecifiedUnspecified
Government of SpainMAT2009-08771UnspecifiedUnspecifiedUnspecified

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Item ID: 40949
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Deposited by: Memoria Investigacion
Deposited on: 11 Jun 2016 08:56
Last Modified: 11 Jun 2016 08:56
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