Publication detail

Magnetic phase dependency of the thermal conductivity of FeRh from thermoreflectance experiments and numerical simulations

Castellano, A. Alhada-Lahbabi, K. Arregi, JA. Uhlir, V. Perrin, B. Gourdon, C. Fournier, D. Verstraete, MJ. Thevenard, L.

Original Title

Magnetic phase dependency of the thermal conductivity of FeRh from thermoreflectance experiments and numerical simulations

Type

journal article in Web of Science

Language

English

Original Abstract

FeRh is well known in its bulk form for a temperature-driven antiferromagnetic (AFM) to ferromagnetic (FM) transition near room temperature. It has aroused renewed interest in its thin-film form, with particular focus on its biaxial AFM magnetic anisotropy which could serve for data encoding, and the possibility to investigate laserassisted phase transitions, with varying contributions from electrons, phonons, and magnons. In order to estimate the typical temperature increase occurring in these experiments, we performed modulated thermoreflectance microscopy to determine the thermal conductivity kappa of FeRh. As often occurs upon alloying, and despite the good crystallinity of the layer, kappa was found to be lower than the thermal conductivities of its constituting elements. More unexpectedly, given the electrically more conducting nature of the FM phase, it turned out to be three times lower in the FM phase compared to the AFM phase. This trend was confirmed by examining the temporal decay of incoherent phonons generated by a pulsed laser in both phases. To elucidate these results, first- and second-principles simulations were performed to estimate the phonon, magnon, and electron contributions to the thermal conductivity. They were found to be of the same order of magnitude, and to give a quantitative rendering of the experimentally observed kappa AFM. In the FM phase, however, simulations overestimate the low experimental values, implying very different (shorter) electron and magnon lifetimes.

Keywords

IRON-RHODIUM; TRANSITION; TEMPERATURE; RESISTANCE; SPECTRUM; IRIDIUM; ALLOYS; HEAT

Authors

Castellano, A.; Alhada-Lahbabi, K.; Arregi, JA.; Uhlir, V.; Perrin, B.; Gourdon, C.; Fournier, D.; Verstraete, MJ.; Thevenard, L.

Released

28. 8. 2024

Publisher

AMER PHYSICAL SOC

Location

COLLEGE PK

ISBN

2475-9953

Periodical

PHYSICAL REVIEW MATERIALS

Year of study

8

Number

8

State

United States of America

Pages count

14

URL

https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.8.084411

BibTex

@article{BUT189715,
  author="Castellano, A. and Alhada-Lahbabi, K. and Arregi, JA. and Uhlir, V. and Perrin, B. and Gourdon, C. and Fournier, D. and Verstraete, MJ. and Thevenard, L.",
  title="Magnetic phase dependency of the thermal conductivity of FeRh from thermoreflectance experiments and numerical simulations",
  journal="PHYSICAL REVIEW MATERIALS",
  year="2024",
  volume="8",
  number="8",
  pages="14",
  doi="10.1103/PhysRevMaterials.8.084411",
  issn="2475-9953",
  url="https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.8.084411"
}