164. a surface enhanced raman spectroscopy investigation of heat assisted magnetic recording

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Center for Magnetic Recording Research (CMRR)
Faculty Advisor(s): Frank E. Talke

Primary Student
Name: Benjamin Ying-Xiu Suen
Email: bsuen@ucsd.edu
Phone: 858-534-6196
Grad Year: 2017

Heat assisted magnetic recording (HAMR) is a future data storage technology that can greatly increase the storage capacity of hard disk drives. HAMR operates by heating a spot on magnetic recording media, to approximately its Curie temperature, using a near field optical transducer. While the media is hot, a magnetic field is applied, and the orientation of the magnetic field is preserved in the magnetic recording media as it cools. The direction of the preserved magnetic field corresponds to the digital ones and zeros of the data being recorded. The intense near field radiation, along with its associated heating, causes damage to the magnetic recording media. A potential method for studying this damage is to reproduce the near field radiation in a controlled environment and then measure the resulting recording media damage by observing chemical changes. We propose fabricating a near field optical transducer from an atomic force microscope probe to replicate HAMR-like near field radiation and observing changes in the Raman spectra in order to quantify chemical changes. This proposal uses similar methods to those used in tip-enhanced Raman spectroscopy (TERS). As of the writing of this abstract, the authors cannot find studies that use plasmon enhanced Raman spectroscopy methods such as TERS or surface enhanced Raman spectroscopy (SERS) to study diamond like carbon (DLC), the analyte of interest in the magnetic recording media. As an initial step before constructing a near field transducer, we propose using SERS to examine under what conditions will the DLC exhibit enhanced Raman scattering. SERS particle geometry, DLC structure and chemistry, laser polarization, and other aspects can be varied in order to study their effect on the intensity of the Raman scattering.

Industry Application Area(s)
Electronics/Photonics | Materials | Data Storage

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