Evidence of high dissipation in magnetization reversal processes of five Co/Cu bilayers

Serrano-Guisan, S.; Gravier, L.; Ansermet, Jean-Philippe

doi:10.1016/j.mseb.2005.09.028

Cited by 9 publications

(9 citation statements)

References 17 publications

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“…The sharp MTGV peaks observed in this instance confirm previous studies on the MTGV of five Co/Cu bilayers [6]. They are not due to the previously observed spin-dependent Peltier effect [3] since the temperature change over the thickness of one bilayer is extremely small.…”

Section: Resultssupporting

confidence: 89%

“…The thermoelectric contribution is negligible compared to the MTGV signals observed at this current [6]. The baseline of the measurements is due to the temperature dependence of the resistivity of the Cu nanowires.…”

Section: Article In Pressmentioning

confidence: 71%

“…In our research, spin-dependent transport is probed by a novel measurement protocol called magneto-thermogalvanic voltage (MTGV), where we monitor the AC voltage response induced by an oscillating heat source under a constant DC current, revealing for example, spin-dependent Peltier [3] and Seebeck effects [4]. We also have applied this measurement to thin films containing magnetic clusters [5] and to nanowires containing five equally spaced Co/Cu bilayers [6]. In this paper, we apply this measurement technique to Co/Cu/Co pseudo-spin valves (PSV) with the current perpendicular to the plane of the layers (CPP).…”

Section: Introductionmentioning

confidence: 99%

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Temperature derivative of the resistance of spin valves

Granville

Dubois

et al. 2010

Journal of Magnetism and Magnetic Materials

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a b s t r a c tSpin-dependent transport properties of nanowires containing individual Co/Cu/Co pseudo-spin valves were investigated by monitoring an AC voltage induced by a temperature oscillation under a continuous DC current. We observed sharp peaks in the field-dependent AC voltage response. These peaks only appear close to the magnetic field range where conventional magnetoresistance shows a reversible and gradual transition. The effect is interpreted as an extra dissipation process with a distinct temperature dependence that occurs in non-collinear magnetic configurations when transverse moment relaxation takes place.

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Section: Resultssupporting

confidence: 89%

Section: Article In Pressmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Temperature derivative of the resistance of spin valves

Granville

Dubois

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…This was among the first pieces of evidence for the effect of spin polarized current on magnetization [16][17][18], and can also be observed in our electro-deposited samples [19]. This precession induces further dissipative processes that add a contribution to the effective resistance that could contribute to the TGV response [20]. Finally, we note that TGV measurement relies on the heating produced by the illumination obtained with a laser diode shining on one side of the membrane.…”

Section: Tgv Of Spin Valvessupporting

confidence: 69%

Heat and spin transport in magnetic nanowires

Granville

et al. 2010

Solid State Communications

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a b s t r a c tTransport measurements are carried out in which temperature oscillation is applied to magnetic nanostructures. Using spin valves, this measurement reveals aspects of the spin transport in non-collinear configurations. In one implementation, an AC voltage is detected when a DC current is driven through the nanostructure under test and its temperature is made to oscillate by illuminating it with a laser diode. A simpler approach is presented that relies on Joule heating to generate the temperature oscillation, thus eliminating the need for any optical component.

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“…The largest variation of 80% corresponds to the steepest slope of the magnetoresistive curve, that is, to the most unstable configuration of the magnetic moments of each layer, forced out-of-plane in this case [8]. This feature is especially obvious for nanowire systems composed of a limited number of layers, as shown in reference [9].…”

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confidence: 90%

Spin mixing processes in magnetic nanostructures detected by thermoelectric measurements

et al. 2007

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Abstract. -Spin-dependent transport properties of magnetic nanostructures have been investigated by means of magneto-thermogalvanic voltage measurements: the ac voltage response to an ac temperature oscillation is measured for various magnetic nanostructures under dc current. The samples studied include Co/Cu multilayered nanowires, homogeneous Ni nanowires and cobalt clusters embedded in copper films. The magnetic field dependence of this signal is always larger than the magneto-resistance (MR) and may be anisotropic even when the MR is not. A thermodynamic argument introduces spin mixing as the main process measured by this novel thermoelectric measurement technique. This effect is not observed in magnetite as can be justified by the absence of an accessible second spin channel.Spin-dependent transport in magnetic materials is one of the key ingredients of spintronics and has already demonstrated its importance in effects like Giant magnetoresistance (GMR) [1,2]. Valet and Fert described this effect with the help of a two-current model [3], neglecting the reduction of GMR due to spin mixing processes, on the basis that they were negligible. In the present paper, we investigate these spin mixing effects by means of a novel thermoelectric experiment, called magneto-thermogalvanic voltage (MTGV). We have applied this measurement technique to various magnetic systems, like nanowires (homogenous and multilayered) and films (granular structures). Our data show that the observed magnetic field response must arise from a mechanism distinct from GMR. A thermodynamic approach, based on transport matrix for a magnetic medium [4], suggests that MTGV depends on spin mixing effects.

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Evidence of high dissipation in magnetization reversal processes of five Co/Cu bilayers

Cited by 9 publications

References 17 publications

Temperature derivative of the resistance of spin valves

Temperature derivative of the resistance of spin valves

Heat and spin transport in magnetic nanowires

Spin mixing processes in magnetic nanostructures detected by thermoelectric measurements

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