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Anisotropic Heatsinks for Heat-Assisted Magnetic Recording.
- Source :
-
IEEE Transactions on Magnetics . Jan2021, Vol. 51 Issue 1, p1-5. 5p. - Publication Year :
- 2021
-
Abstract
- The relevance of anisotropic heatsinks for heat-assisted magnetic recording (HAMR) is investigated. First, 3-D thermal modeling is used to demonstrate that the heatsink performance on a glass substrate is determined by the heatsink in-plane thermal conductivity. The out-of-plane thermal conductivity has almost no impact on the heatsink ability to carry heat away from the hot spot. As a result, an anisotropic heatsink can be a good alternative to some conventional isotropic heatsink materials when its in-plane thermal conductivity is larger than that of the isotropic material. Second, time-domain thermo-reflectance (TDTR) measurements are presented to extract both the in-plane and the out-of-plane thermal conductivities of a (Cu/Ta) multilayer heatsink. The sensitivity to in-plane thermal conductivity is achieved by using small laser beam sizes and by combining measurements at multiple modulation frequencies on both a low and a high thermally conductive substrate. The fitting of all TDTR spectra gives for the (Cu[5.1]/Ta[1.4]) multilayers an effective out-of-plane thermal conductivity of 11.5 W/mK and an in-plane thermal conductivity of 69 W/mK. These thermal properties make such multilayer material an interesting candidate as HAMR heatsink, equivalent to a 70 W/mK isotropic material. [ABSTRACT FROM AUTHOR]
- Subjects :
- *THERMAL conductivity
*THERMAL properties
*LASER beams
*HEAT sinks
*MULTILAYERS
Subjects
Details
- Language :
- English
- ISSN :
- 00189464
- Volume :
- 51
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Magnetics
- Publication Type :
- Academic Journal
- Accession number :
- 148281593
- Full Text :
- https://doi.org/10.1109/TMAG.2020.3019802