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Heat-assisted magnetic recording (HAMR) enables ultra-high areal density by locally heating magnetic recording media with high magnetic anisotropy, but the writing performance critically depends on the behavior of heat flow in its complex multilayer structure. In this work, we establish an experiment-informed approach that combines time-domain thermoreflectance (TDTR) with a step-by-step fitting strategy to extract the thermal conductivities and interfacial thermal resistances in HAMR media. These experimentally determined properties are directly implemented in finite-element method simulations, which show good agreement with reported spin-stand measurements. The TDTR-based experiment-informed modeling established in this study reliably describes a device-level HAMR behavior and provides a quantitative guidance for recording media design.

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  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Kota Hasegawa, Takamasa Hirai, Takayuki Fukushima, Fuyuki Ando, Naoki Takahara, Ken-ichi Uchida; Experimental determination of nanoscale thermal transport properties in heat-assisted magnetic recording media using step-by-step time-domain thermoreflectance method. Appl. Phys. Lett. 1 June 2026; 128 (22): 222201 and may be found at https://doi.org/10.1063/5.0339978.

Keyword: Time-domain thermoreflectance, Heat-assisted magnetic recording

Date published: 2026-06-01

Publisher: AIP Publishing

Journal:

• Applied Physics Letters (ISSN: 00036951) vol. 128 issue. 22 222201

Funding:

• Japan Science and Technology Agency JPMJER2201
• Japan Society for the Promotion of Science 25K17940

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6327

First published URL: https://doi.org/10.1063/5.0339978

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Updated at: 2026-06-09 11:44:28 +0900

Published on MDR: 2026-06-09 15:25:48 +0900