Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures

Bieren, Arndt von; Brandl, Florian; Grundler, D.; Ansermet, Jean-Philippe

doi:10.1063/1.4789974

Cited by 25 publications

(25 citation statements)

References 15 publications

(17 reference statements)

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“…Anomalous Nernst effect as a function of IrMn thickness. In addition to the Seebeck effect, the anomalous Nernst effect (ANE) [68][69][70][71][72][73] is also investigated with different IrMn thicknesses with magnetic fields applied out of the plane of the film and ANE voltages measured along a line normal to the in-plane temperature gradient. The Nernst coefficients at room temperature are extracted for all samples (see Supplementary Note 15 and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Record thermopower found in an IrMn-based spintronic stack

Ziman

et al. 2020

Nat Commun

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The Seebeck effect converts thermal gradients into electricity. As an approach to power technologies in the current Internet-of-Things era, on-chip energy harvesting is highly attractive, and to be effective, demands thin film materials with large Seebeck coefficients. In spintronics, the antiferromagnetic metal IrMn has been used as the pinning layer in magnetic tunnel junctions that form building blocks for magnetic random access memories and magnetic sensors. Spin pumping experiments revealed that IrMn Néel temperature is thickness-dependent and approaches room temperature when the layer is thin. Here, we report that the Seebeck coefficient is maximum at the Néel temperature of IrMn of 0.6 to 4.0 nm in thickness in IrMn-based half magnetic tunnel junctions. We obtain a record Seebeck coefficient 390 (±10) μV K −1 at room temperature. Our results demonstrate that IrMnbased magnetic devices could harvest the heat dissipation for magnetic sensors, thus contributing to the Power-of-Things paradigm.

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Section: Resultsmentioning

confidence: 99%

Record thermopower found in an IrMn-based spintronic stack

Ziman

et al. 2020

Nat Commun

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“…Usually, the temperature gradient is calculated by simulation, rather than directly measured. 24,38 Alternatively, the converse geometry is used, i.e., in-plane temperature gradient and out-of-plane magnetic fields. 39 The geometry with an out-of-plane magnetic field and an in-plane temperature gradient is the natural configuration when studying perpendicularly magnetized ordered-alloy thin films.…”

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confidence: 99%

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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“…1(a). The vertical component of the transient thermal gradient that is induced by local laser heating generates a voltage pulse corresponding to the magnetization projection in y direction, through the anomalous Nernst effect (ANE) [32][33][34] . To excite FMR in our samples, we inject a radio-frequency current I rf into the sample, through a circulator, using an arbitrary waveform generator with a fixed frequency of 5.7 GHz.…”

Section: A Measurement Techniquementioning

confidence: 99%

Ferromagnetic resonance phase imaging in spin Hall multilayers

2016

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We experimentally image the magnetic precession phase of patterned spin Hall multilayer samples to study the rf driving field vector using time-resolved anomalous Nernst effect (TRANE) microscopy. Our ferromagnetic resonance (FMR) measurements quantify the phase and amplitude for both the magnetic precession and the electric current, which allows us to establish the total driving field orientation and the strength of spin Hall effect. In a channel of uniform width, we observe spatial variation of the FMR phase laterally across the channel. We interpret our findings in the context of electrical measurement using the spin-transfer torque ferromagnetic resonance technique and show that observed phase variation introduces a systematic correction into the spin Hall angle if spatial phase and amplitude variations are not taken into account.Comment: 6 pages, 7 figure

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Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures

Cited by 25 publications

References 15 publications

Record thermopower found in an IrMn-based spintronic stack

Record thermopower found in an IrMn-based spintronic stack

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

Ferromagnetic resonance phase imaging in spin Hall multilayers

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