Cox_2020_J._Phys._D__Appl._Phys._53_035005.pdf (2.13 MB)
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Anomalous Nernst effect in Co2MnSi thin films

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journal contribution
posted on 21.11.2019, 09:44 authored by Chris Cox, AJ Caruana, Michael CropperMichael Cropper, Kelly MorrisonKelly Morrison
Separation of the anomalous Nernst and spin Seebeck voltages in bilayer devices is often problematic when both layers are metallic, and the anomalous Nernst effect (ANE) becomes non-negligible. Co2MnSi, a strong candidate for the spin generator in spin Seebeck devices, is a predicted half-metal with 100% spin polarisation at the Fermi energy, however, typically B2 or L21 order is needed to achieve this. We demonstrate the optimisation of thin film growth of Co2MnSi on glass, where choice of deposition and annealing temperature can promote various ordered states. The contribution from the ANE is then investigated to inform future
measurements of the spin Seebeck. A maximum ANE coefficient of 0.662 µV K−1 is found for an A2 disordered polycrystalline Co2MnSi film. This value is comparable to ordered Heusler
thin films deposited onto single crystal substrates but obtained at a far lower fabrication temperature and material cost.

Funding

Feasibility of heat conversion to electricity by new spin Seebeck based thermoelectrics

Reliable, Scalable and Affordable Thermoelectrics: Spin Seebeck Based Devices for Energy Conversion

Underpinning Multi-User Equipment

History

School

  • Science

Department

  • Physics

Published in

Journal of Physics D: Applied Physics

Volume

53

Issue

3

Publisher

IOP Publishing

Version

VoR (Version of Record)

Rights holder

© IOP

Publisher statement

This is an Open Access Article. It is published by IOP under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Acceptance date

17/10/2019

Publication date

2019-11-06

Copyright date

2020

ISSN

0022-3727

eISSN

1361-6463

Language

en

Depositor

Dr Kelly Morrison Deposit date: 20 November 2019

Article number

035005