Field-dependent nonelectronic contributions to thermal conductivity in a metallic ferromagnet with low Gilbert damping
Field-dependent nonelectronic contributions to thermal conductivity in a metallic ferromagnet with low Gilbert damping
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场相关的非电子对低吉尔伯特阻尼金属铁磁体热导率的贡献
DOI:
10.1103/physrevmaterials.5.l111401
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发表时间:
2021
影响因子:
3.4
通讯作者:
Zink, B. L.
中科院分区:
文献类型:
--
作者:
Natale, M. R.;Wesenberg, D. J.;Edwards, Eric R.;Nembach, Hans T.;Shaw, Justin M.;Zink, B. L.
Heat conduction in metals is typically dominated by electron transport since electrons carry both charge and heat. In magnetic metals magnons, or spin waves, excitations of the magnetic order can be used to transport information. Heat conduction via magnons has been previously shown mostly for insulating magnets with low Gilbert damping and resulting long spin-wave lifetimes where conduction electrons cannot contribute. Here we show that thin films of properly optimized metallic ferromagnetic (FM) alloys show significant nonelectronic contributions to heat conduction, which furthermore depend on the direction of an applied magnetic field. These measurements are enabled by micromachined thermal isolation platforms optimized for thermal conductivity measurements of thin-film systems. Electrical conductivity measurements on exactly the same samples allow application of the Wiedemann-Franz relation, which shows large nonelectronic contributions to thermal conductivity for the cobalt-iron alloy withCo. This composition has been shown to have exceptionally low damping for a metallic FM. The thermal conductivity of a 75-nm-thick film of theCo alloy changes by more thanat some temperatures, while a reference sample withcobalt that has much higher damping shows no field-direction dependence. Our measurements indicate that applied magnetic fields alter the magnon lifetimes in these films and that these magnons contribute to thermal conductivity in this metallic magnetic alloy with low Gilbert damping.
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影响因子:
3.2
作者:
Yuanhua Zheng;E. Weiss;Nikolas Antolin;W. Windl;J. Heremans
通讯作者:
J. Heremans
影响因子:
10.8
作者:
Cramer, Joel;Guo, Er-Jia;Goennenwein, Sebastian T. B.
通讯作者:
Goennenwein, Sebastian T. B.
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
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作者:
Chumak, A. V.;Serga, A. A.;Hillebrands, B.
通讯作者:
Hillebrands, B.
影响因子:
4
作者:
Goennenwein, Sebastian T. B.;Schlitz, Richard;Huebl, Hans
通讯作者:
Huebl, Hans