Effect of Joule heating in current-driven domain wall motion

Details Effect of Joule heating in current-driven domain wall motion Effect of Joule heating in current-driven domain wall motion

2004-09-20

arxiv.org/abs/cond-mat/0409494v1

Physics

Condensed Matter

Materials Science

13 pages, 4 figures

Scientific paper

10.1063/1.1847714

It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the sample. The sample temperature, when the current-driven domain wall motion occurred, was estimated by measuring the sample resistance during the application of a pulsed-current. The sample temperature was 750 K for the threshold current density of 6.7 x 10^11 A/m2 in a 10 nm-thick Ni81Fe19 wire with a width of 240 nm. The temperature was raised to 830 K for the current density of 7.5 x 10^11 A/m2, which is very close to the Curie temperature of bulk Ni81Fe19. When the current density exceeded 7.5 x 10^11 A/m2, an appearance of a multi-domain structure in the wire was observed by magnetic force microscopy, suggesting that the sample temperature exceeded the Curie temperature.

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