Effect of FePt on resonant behaviour of a near field transducer for high areal density heat assisted magnetic recording

2014 ◽  
Vol 104 (11) ◽  
pp. 111107 ◽  
Author(s):  
Sajid Hussain ◽  
Charanjit S. Bhatia ◽  
Hyunsoo Yang ◽  
Aaron J. Danner
Keyword(s):  
Magnetic Recording ◽  
Near Field ◽  
Areal Density ◽  
Heat Assisted Magnetic Recording

Transient Thermal Response of the Media by Free Space Laser Heating in Heat Assisted Magnetic Recording

2016 ◽  
Author(s):  
Shaomin Xiong ◽  
Robert Smith ◽  
Na Wang ◽  
Dongbo Li ◽  
Erhard Schreck ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Heat Conduction Problem ◽  
Temperature Response ◽  
Thermal Response ◽  
Areal Density ◽  
Heat Assisted Magnetic Recording ◽  
Lumped Model ◽  
The Media ◽  
Transient Thermal ◽  
Transient Thermal Response

Heat assisted magnetic recording (HAMR) promises to deliver higher storage areal density than the current perpendicular magnetic recording (PMR) product. A laser is introduced to the HAMR system to heat the high coercively magnetic media above the Curie temperature (Tc) which is as high as 750 K in order to enable magnetic writing. The thermal response of the media becomes very critical for the success of the data writing process. In this paper, a new method is proposed to understand the transient thermal behavior of the HAMR media. The temperature response of the media is measured based on thermal erasure of the magnetically written signal. A lumped model is built to simplify the heat conduction problem to understand the transient thermal response. Finite element modeling (FEM) is implemented to simulate the transient thermal response of the media due to the laser pulse heating. The experimental and simulation results show fairly good agreement.

scholarly journals Novel droplet near-field transducer for heat-assisted magnetic recording

Nanophotonics ◽  
2015 ◽  
Vol 4 (4) ◽  
pp. 503-510 ◽  
Author(s):  
Jacek Gosciniak ◽  
Marcus Mooney ◽  
Mark Gubbins ◽  
Brian Corbett
Keyword(s):  
Surface Plasmon ◽  
Magnetic Recording ◽  
Near Field ◽  
Metal Structure ◽  
Spot Size ◽  
Impedance Match ◽  
Localized Surface Plasmon ◽  
Heat Assisted Magnetic Recording ◽  
Localized Surface Plasmon Resonances ◽  
High Degree

AbstractTwo main ingredients of plasmonics are surface plasmon polaritons (SPP) and localized surface plasmon resonances (LSPR) as they provide a high degree of concentration of electromagnetic fields in the vicinity of metal surfaces, which is well beyond that allowed by the diffraction limit of optics. Those properties have been used in the new technique of heat assisted magnetic recording (HAMR) to overcome an existing limit of conventional magnetic recording by utilizing a near-field transducer (NFT). The NFT designs are based on excitation of surface plasmons on a metal structure, which re-radiate with a subdiffraction limited light spot confined in the near field. In this paper, we propose a novel “droplet”-shaped NFT, which takes full advantage of a recenltly proposed Mach–Zehnder Interferometer (MZI), a coupling arrangement that allows optimal coupling of light to the transducer. The droplet design ensures better impedance match with the recording media and, consequently, better coupling of power. The droplet design results in very high enhancement of the electric field and allows the confinement of light in a spot size much smaller than the present stateof- the-art lollipop transducer.

Design for cooling near-field transducer using surface plasmon polariton waveguide for heat-assisted magnetic recording

2018 ◽  
Vol 57 (9S2) ◽  
pp. 09TB01
Author(s):  
Katsuji Nakagawa ◽  
Kousuke Kimura ◽  
Yoshihiko Hayashi ◽  
Kyosuke Tamura ◽  
Yoshito Ashizawa ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Magnetic Recording ◽  
Surface Plasmon Polariton ◽  
Near Field ◽  
Heat Assisted Magnetic Recording ◽  
Plasmon Polariton

Areal-Density Limits for Heat-Assisted Magnetic Recording and Perpendicular Magnetic Recording

2016 ◽  
Vol 52 (7) ◽  
pp. 1-4 ◽  
Author(s):  
Chris Rea ◽  
Pradeep Subedi ◽  
Kaizhong Gao ◽  
Hua Zhou ◽  
Pu-Ling Lu ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Areal Density ◽  
Heat Assisted Magnetic Recording ◽  
Perpendicular Magnetic Recording

Near-Field Optical Transducer for Heat-Assisted Magnetic Recording for Beyond-10-Tbit/in2 Densities

2008 ◽  
Vol 3 (1) ◽  
pp. 44-54 ◽  
Author(s):  
R. Ikkawi ◽  
N. Amos ◽  
A. Lavrenov ◽  
A. Krichevsky ◽  
D. Teweldebrhan ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Near Field ◽  
Heat Assisted Magnetic Recording ◽  
Optical Transducer
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