Effect of Joule heating in current-driven domain wall motion

Yamaguchi, Akinobu; Nasu, Saburo; Tanigawa, H.; Ono, Teruo; Miyake, Koji; Mibu, Ko; Shinjo, Teruya

doi:10.1063/1.1847714

Cited by 165 publications

(145 citation statements)

References 13 publications

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“…There have been only few experimental attempts to estimate the average temperature in magnetic nanostripes when an electric current flows through the device, using DC current [9], long current pulses [10,11] or short nanosecond pulses [3,12]. The estimated temperature in these works is quite different for similar current densities although, as we will see in the conclusions, not necessarily contradictory.…”

Section: Introductionmentioning

confidence: 53%

Joule heating in ferromagnetic nanostripes with a notch

et al. 2015

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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 the substrate (SiO 2 ). Notably, a nonzero interface thermal resistance between the metallic nanostripe and the substrate was also necessary to fit the experimental curves. We found this parameter pivotal to understand our results 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.

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Section: Introductionmentioning

confidence: 53%

Joule heating in ferromagnetic nanostripes with a notch

et al. 2015

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“…The experimental results show that the sample temperature increases less than 5 K when the current density is order of 10 5 ∼ 10 6 A/cm 2 [3], while the temperature is dramatically increased when the current density is 10 7 A/cm 2 [28]. These studies are for a steady current density.…”

Section: Discussionmentioning

confidence: 72%

Effects of spin current on ferromagnets (invited)

Zhang

2006

Journal of Applied Physics

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When a spin-polarized current flows through a ferromagnet, the local magnetization receives a spin torque. Two consequences of this spin torque are studied. First, the uniformly magnetized ferromagnet becomes unstable if a sufficiently large current is applied. The characteristics of the instability include spin wave generation and magnetization chaos. Second, the spin torque has profound effects on the structure and dynamics of the magnetic domain wall. A detail analysis on the domain wall mass, kinetic energy and wall depinning threshold is given.

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“…2(a) are normalized to the highest percentage change. The overall change in resistance for a DW is about 0:06 , which is a factor of 5 smaller than suggested by numerical modeling [24], and we estimate a corresponding increase in sample temperature of around 14 K [25]. The red bands are due to DW formation at the constriction (AE10 Oe) and subsequent depinning (AE15 Oe).…”

mentioning

confidence: 85%

Dependence of Domain-Wall Depinning Threshold Current on Pinning Profile

et al. 2009

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Effect of Joule heating in current-driven domain wall motion

Cited by 165 publications

References 13 publications

Joule heating in ferromagnetic nanostripes with a notch

Joule heating in ferromagnetic nanostripes with a notch

Effects of spin current on ferromagnets (invited)

Dependence of Domain-Wall Depinning Threshold Current on Pinning Profile

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