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Thermal coupling parameters between electron, phonon, and magnon of Nickel

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Title
Thermal coupling parameters between electron, phonon, and magnon of Nickel
Author(s)
Kyuhwe Kang; Gyung-Min Choi
Subject
HEAT-CONDUCTION, ; SPIN, ; FEMTOSECOND, ; NI, ; DYNAMICS, ; SPECTRA, ; FERROMAGNET, ; RELAXATION, ; EXCITATION, ; TRANSPORT
Publication Date
2020-11
Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.514, pp.167156
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2020 Elsevier B.V.Thermal interaction in an electron-phonon-magnon system in a ferromagnetic Ni film is investigated using a time-resolved pump-probe technique with thermoreflectance and magneto-optical Kerr effect. A nanoscale Au/Ni bilayer is used to induce thermal excitation of Ni in two ways: direct heating of Ni and indirect heating of Ni via Au. By comparing experiments and thermal modeling, we obtain the coupling parameters for electron-phonon, electron-magnon, and phonon-magnon pairs: 8.55 × 1017, 1.0–1.3 × 1017, and 0.8–1.1 × 1017 W m−3 K−1, respectively. In particular, we find that the phonon-magnon coupling parameter plays a significant role as a fast heat dissipation channel from magnon to phonon during the initial few picoseconds. In addition, both direct and indirect heating can be explained by similar coupling parameters with a variation less then 30%. Consequently, we conclude that the heat exchange between electron, phonon, and magnon is the dominant mechanism for the ultrafast demagnetization
URI
https://pr.ibs.re.kr/handle/8788114/8451
DOI
10.1016/j.jmmm.2020.167156
ISSN
0304-8853
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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