Field-dependent nonelectronic contributions to thermal conductivity in a metallic ferromagnet with low Gilbert damping

Natale, M. R.; Wesenberg, D. J.; Edwards, Eric J.; Nembach, Hans T.; Shaw, Justin M.; Zink, B. L.

doi:10.1103/physrevmaterials.5.l111401

Field-dependent nonelectronic contributions to thermal conductivity in a metallic ferromagnet with low Gilbert damping

Journal Article · Mon Nov 22 23:00:00 EST 2021 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.5.l111401· OSTI ID:1982833

Natale, M. R. ^[1]; Wesenberg, D. J. ^[1]; Edwards, Eric J. ^[2]; Nembach, Hans T. ^[3]; Shaw, Justin M. ^[2]; ^[1]

Univ. of Denver, CO (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States)

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 with 25% Co. This composition has been shown to have exceptionally low damping for a metallic FM. The thermal conductivity of a 75-nm-thick film of the 25% Co alloy changes by more than 20% at some temperatures, while a reference sample with 50% cobalt 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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396; AC04-94AL85000

OSTI ID:: 1982833

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 11 Vol. 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Field-dependent nonelectronic contributions to thermal conductivity in a metallic ferromagnet with low Gilbert damping

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