Spin caloritronics, origin and outlook

Yu, Haiming; Brechet, Sylvain D.; Ansermet, Jean-Philippe

doi:10.1016/j.physleta.2016.12.038

Cited by 97 publications

(55 citation statements)

References 160 publications

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“…A branch of spintronics called spin caloritronics [1][2][3][4][5][6][7][8][9][10][11][12][13] focuses on the interplay of spin and heat currents. The effects discovered in this emerging research field have revived interest in the anomalous Nernst effect (ANE), which is defined as the voltage observed perpendicular to both the heat current and the spontaneous magnetization.…”

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confidence: 99%

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Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

et al. 2017

Applied Physics Letters

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The anomalous Nernst effect in a perpendicularly magnetized Ir22Mn78/Co20Fe60B20/MgO thin film is measured using well-defined in-plane temperature gradients. The anomalous Nernst coefficient reaches 1.8 μV/K at room temperature, which is almost 50 times larger than that of a Ta/Co20Fe60B20/MgO thin film with perpendicular magnetic anisotropy. The anomalous Nernst and anomalous Hall results in different sample structures revealing that the large Nernst coefficient of the Ir22Mn78/Co20Fe60B20/MgO thin film is related to the interface between CoFeB and IrMn.

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confidence: 99%

“…We study the Nernst effect in a thin film of the following structure: Ta (5)/IrMn (2.5)/CoFeB (0.9)/MgO (1)/Ta (2), where thicknesses are in nm, and the layers are listed from bottom to top [ Fig. 1(a)].…”

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Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

et al. 2017

Applied Physics Letters

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“…There are three thermomagnetic effects that come into question when considering ferromagnetic metal materials whose temperature gradient ∇ and the magnetization are aligned in the same plane. The first two are the anisotropic magneto thermopower (AMTP) AMTP ∝ ∇ ⋅ cos( ∇ ) 2 ⋅ cos(2 ) and the planar Nernst effect (PNE) PNE ∝ ∇ ⋅ sin( ∇ ) ⋅ 2 ⋅ sin (2 ). The angles ∇ and express the direction of ∇ and with respect to the direction of voltage measurement.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Nernst effect and three-dimensional temperature gradients in magnetic tunnel junctions

et al. 2018

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Localized laser heating creates temperature gradients in all directions and thus leads to three-dimensional electron flux in metallic materials. Temperature gradients in combination with material magnetization generate thermomagnetic voltages. The interplay between these direction-dependent temperature gradients and the magnetization along with their control enable to manipulate the generated voltages, e.g. in magnetic nanodevices. We identify the anomalous Nernst effect (ANE) generated on a nanometer length scale by micrometer sized temperature gradients in magnetic tunnel junctions (MTJs). In a systematic study, we extract the ANE by analyzing the influence of in-plane temperature gradients on the tunnel magneto-Seebeck effect (TMS) in three dimensional devices. To investigate these effects, we utilize in-plane magnetized MTJs based on CoFeB electrodes with an MgO tunnel barrier. Due to our measurement configuration, there is no necessity to disentangle the ANE from the spin Seebeck effect in inverse spin-Hall measurements. The temperature gradients are created by a tightly focused laser spot. The spatial extent of the measured effects is defined by the MTJ size, while the spatial resolution is given by the laser spot size and the step size of its lateral translation. This method is highly sensitive to low voltages and yields an ANE coefficient of ≈ . ⋅ − for CoFeB. In general, TMS investigations in MTJs are motivated by the usage of otherwise wasted heat in magnetic memory devices for read/write operations. Here, the additionally generated ANE effect allows to expand the MTJs' functionality from simple memory storage to nonvolatile logic devices and opens new application fields such as direction dependent temperature sensing with the potential for further downscaling.

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“…Reciprocal relations can also be used to analyze transport phenomena which involve not only the electric charge and the heat, but also the spin. Spincaloritronic phenomena [5,6,7] can provide additional tools to the field of spintronics, envisioned to be a faster and lower energy consuming alternative to classical electronics [8]. One of the key building blocks for "spintronic circuits" is the spin battery, a device which can drive a spin current into an external circuit.…”

Section: Introductionmentioning

confidence: 99%

Experimental proof of the reciprocal relation between spin Peltier and spin Seebeck effects in a bulk YIG/Pt bilayer

Sola

Basso

Kuepferling

et al. 2019

Sci Rep

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We verify for the first time the reciprocal relation between the spin Peltier and spin Seebeck effects in a bulk YIG/Pt bilayer. Both experiments are performed on the same YIG/Pt device by a setup able to accurately determine heat currents and to separate the spin Peltier heat from the Joule heat background. The sample-specific value for the characteristics of both effects measured on the present YIG/Pt bilayer is (6.2 ± 0.4) × 10−3 KA−1. In the paper we also discuss the relation of both effects with the intrinsic and extrinsic parameters of YIG and Pt and we envisage possible strategies to optimize spin Peltier refrigeration.

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Spin caloritronics, origin and outlook

Cited by 97 publications

References 160 publications

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy

Anomalous Nernst effect and three-dimensional temperature gradients in magnetic tunnel junctions

Experimental proof of the reciprocal relation between spin Peltier and spin Seebeck effects in a bulk YIG/Pt bilayer

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