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The rapid global growth in data volume has intensified the need to increase the recording density of hard disk drives (HDDs) while reducing storage costs. Heat-assisted magnetic recording (HAMR), a next-generation HDD technology based on laser-induced heating, requires accurate thermal design of the recording medium for high performance. This study examines the thermophysical properties of amorphous NiTa, a candi- date material for heat sinks and adhesion layers in HAMR devices. Frequency-domain thermoreflectance measurements were performed on NiTa films with thicknesses ranging from 5 to 500 nm. The volumetric heat capacity was first determined using sufficiently thick samples, after which the effective thermal conductivity was measured across the full thickness range. The measured values, which include interfacial contributions from the glass substrate and aluminum transducer, were analyzed using a series resistor model. Fitting across all thicknesses yields a thermal con- ductivity of 6:8 6 0:3 (W m−1 K−1) for NiTa. The results indicate that the thermal conductivity remains practically independent of film thickness, consistent with typical transport characteristics of amorphous materials. Furthermore, the thermal conductivity of NiTa thin films is one to two orders of magnitude lower than that of representative crystalline metallic materials.

権利情報:

• In Copyright
  

  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 Yasuaki Ikeda, Yuki Akura, Ryota Takechi, Yukiko K. Takahashi, Jun Hirotani; Thermophysical characterization of amorphous NiTa thin films for heat-assisted magnetic recording using frequency-domain thermoreflectance. Appl. Phys. Lett. 21 September 2026; 129 (12): 122201 and may be found at https://doi.org/10.1063/5.0344300.

キーワード: HAMR, frequency-domain thermoreflectance

刊行年月日: 2026-09-21

出版者: AIP Publishing

掲載誌:

• Applied Physics Letters (ISSN: 00036951) vol. 129 issue. 12 122201

研究助成金:

• Precursory Research for Embryonic Science and Technology JPMJPR20B6
• Core Research for Evolutional Science and Technology JPMJCR21C1
• Japan Society for the Promotion of Science 23K26139
• Japan Society for the Promotion of Science 23K04361
• Japan Society for the Promotion of Science 24K21577
• Japan Society for the Promotion of Science 26K21737
• Japan Society for the Promotion of Science 24KJ1526
• Japan Society for the Promotion of Science 26KJ1583
• MEXT Program Data Creation and Utilization-Type Material Research and Development Project JPMXP1122715503

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.8633

公開URL: https://doi.org/10.1063/5.0344300

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更新時刻: 2026-10-01 08:47:39 +0900

MDRでの公開時刻: 2026-10-01 10:41:00 +0900