Nonreciprocity of electrically excited thermal spin signals in CoFeAl-Cu-Py lateral spin valves

Hu, Shaojie; Cui, Xiaomin; Nomura, Tatsuya; Min, Tai; Kimura, Takashi

doi:10.1103/physrevb.95.100403

Cited by 7 publications

(8 citation statements)

References 50 publications

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“…This effect, which is typically observed in metallic non local spin valves, is called the spin dependent Seebeck effect (SDSE). [135][136][137][138][139][140][141][142][143] As I show at the top of Fig. 11, the non local spin valve (NLSV) consists of two FM nanowires bridged by a non magnetic conductor, with separation L on the order of the spin diffusion length, λ NM of the non-magnetic conductor.…”

Section: Spin Caloritronic Effects: Interfaces and Magnonsmentioning

confidence: 99%

“…This effect adds a voltage signal proportional to the hysteresis of the FM (odd in field), and has been demonstrated many times and used to measure the ANE in several FM nanowires. [34,95,99,143,207] In addition to this field-dependent background effect, there are (in the simplest view) field-independent background contributions to the total measured voltage that arise from interaction of the induced thermal gradients and the Seebeck and Peltier effects. Figs.…”

Section: Thermally-generated Voltages In Nanoscale Non Local Spin Valvesmentioning

confidence: 99%

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Thermal effects in spintronic materials and devices: An experimentalist’s guide

Zink

2022

Journal of Magnetism and Magnetic Materials

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Section: Spin Caloritronic Effects: Interfaces and Magnonsmentioning

confidence: 99%

Section: Thermally-generated Voltages In Nanoscale Non Local Spin Valvesmentioning

confidence: 99%

Thermal effects in spintronic materials and devices: An experimentalist’s guide

Zink

2022

Journal of Magnetism and Magnetic Materials

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“…As in our earlier and other work, 37,38 we use the non-local resistance R vs. H measurements to identify the four switching locations of the NLSV, then measure the non-local voltage as a function of applied current at values of H given at the bottom of Fig. 4.…”

Section: Field (Mt)mentioning

confidence: 99%

“…Thermal gradients at the crucial ferromagnet/non-magnetic metal interface can also drive spin injection in the structure in what is often termed the spin-dependent Seebeck effect (SDSE). [30][31][32][33][34][35][36][37][38][39] The dramatic consequences of the interaction of heat and spin place NLSVs firmly in the growing field of spin caloritronics [40][41][42] that examines coupling between heat and spin in materials and devices.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the Seebeck contribution that is determined ultimately by the average temperature differences in the NLSV, the ANE can contribute measurable voltages that depend on the thermal gradient near the detecting FM. 21,23,38 In this paper, we use micro-and nanofabrication techniques to alter the thermal profile in a typical NLSV dramatically. We fabricate the nanoscale metallic features on a suspended silicon-nitride (Si-N) membrane, which has very low thermal conductance.…”

Section: Introductionmentioning

confidence: 99%

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Thermal gradients and anomalous Nernst effects in membrane-supported nonlocal spin valves

2019

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Metallic non-local spin valves (NLSVs) are important in modern spintronics due to their ability to separate pure spin current from charge current. These metallic nanostructures, often constructed from features with widths in the deep sub-micron regime, generate significant thermal gradients in operation, and the heat generated has important consequences for spin injection and transport. We use e-beam nanolithography to manufacture NLSVs with Ni-Fe alloy ferromagnetic nanowires and aluminum spin channels on 500 nm silicon nitride (Si-N) membranes in order to lower the thermal conductance of the substrate dramatically. While this extreme example of thermal engineering in a spintronic system increases the background non-local signals in ways expected based on earlier work, it also enhances thermoelectric effects, including the anomalous Nernst effect and reveals a previously unknown thermally-assisted electrical spin injection that results from a purely in-plane thermal gradient. We examine these effects as a function of temperature and, by careful comparison with 2D finite element models of the thermal gradients calculated at a single temperature, demonstrate that the anomalous Nernst coefficient of the 35 nm thick Ni-Fe alloy, R N = 0.17 at T = 200 K, is in line with the few previous measurements of this effect for thin films.

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Temperature dependence of the anomalous Nernst coefficient for Ni80Fe20 determined with metallic nonlocal spin valves

2020

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The anomalous Nernst effect, which generates an out-of-plane charge voltage in response to a thermal gradient perpendicular to the magnetization of a ferromagnet, can play a significant role in many spintronic devices where large thermal gradients exist. Since they typically include features deep within the submicron regime, nonlocal spin valves can be made very sensitive to this effect by lowering the substrate thermal conductance. Here, we use nonlocal spin valves suspended on thin silicon nitride membranes to determine the temperature dependence of the anomalous Nernst coefficient of 35 nm thick permalloy (Ni80Fe20) from 78 K to 300 K. In a device with a simple ferromagnet geometry, the transverse Seebeck coefficient shows a weak temperature dependence, with values at all T near 2.5 μV/K. Assuming previously measured values of the Seebeck coefficient for permalloy, which has a near-linear dependence on T, leads to a low temperature upturn in the anomalous Nernst coefficient RN. We also show that the temperature dependence of this coefficient is different when a constricted nanowire is used as the ferromagnetic detector element.

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Nonreciprocity of electrically excited thermal spin signals in CoFeAl-Cu-Py lateral spin valves

Cited by 7 publications

References 50 publications

Thermal effects in spintronic materials and devices: An experimentalist’s guide

Thermal effects in spintronic materials and devices: An experimentalist’s guide

Thermal gradients and anomalous Nernst effects in membrane-supported nonlocal spin valves

Temperature dependence of the anomalous Nernst coefficient for Ni80Fe20 determined with metallic nonlocal spin valves

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