[15a-W9_323-1~5] 22.1 Joint Session M "Phonon Engineering"

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[15a-W9_323-1] Evaluation of nanoscale thermal transport property for heat assisted recording media using time-domain thermoreflectance method

〇Kota Hasegawa^1,2, Takamasa Hirai², Takayuki Fukushima¹, Fuyuki Ando², So Miyaishi¹, Naoki Takahara^1,2, Takashi Kawamori^1,2, Ken-ichi Uchida^2,3 (1.Resonac, 2.NIMS, 3.UTokyo)

Keywords:

TDTR,interfacial thermal resistance,HAMR

With the expansion of generative AI and cloud services, data centers demand high storage capacity, which drives the need for higher areal density in hard disk drives. Heat assisted magnetic recording (HAMR) locally heats the recording layer using a laser on the nanosecond time scale, enabling writing to high-magnetic-anisotropy recording layer. In case of HAMR, it also requires thermal management because temperature profiles and thermal gradients within the media directly affect writing and reliability. Therefore, it's essential to estimate thermal transport properties that reflect nanoscale size effects and interfacial thermal resistance in realistic multilayer. In this presentation, we quantify the thermal properties of HAMR media using time-domain thermoreflectance method and implement them in finite-element modeling to evaluate temperature distributions and thermal gradients under laser-heating conditions.