Heat-assisted magnetic recording by a near-field transducer with efficient optical energy transfer

被引：719

作者：

Challener, W. A. ^{[1
]}

Peng, Chubing ^{[1
]}

Itagi, A. V. ^{[1
]}

Karns, D. ^{[1
]}

Peng, Wei ^{[1
]}

Peng, Yingguo ^{[1
]}

Yang, XiaoMin ^{[1
]}

Zhu, Xiaobin ^{[1
]}

Gokemeijer, N. J. ^{[1
]}

Hsia, Y. -T. ^{[1
]}

Ju, G. ^{[1
]}

Rottmayer, Robert E. ^{[1
]}

Seigler, Michael A. ^{[1
]}

Gage, E. C. ^{[1
]}

机构：

[1] Seagate Technol, Pittsburgh, PA 15222 USA

来源：

NATURE PHOTONICS | 2009年 / 3卷 / 04期

关键词：

MICROSCOPY; LIGHT; BEAM; SPOT;

D O I：

10.1038/NPHOTON.2009.26

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Although near-field microscopy has allowed optical imaging with sub-20 nm resolution, the optical throughput of this technique is notoriously small. As a result, applications such as optical data storage have been impractical. However, with an optimized near-field transducer design, we show that optical energy can be transferred efficiently to a lossy metallic medium and yet remain confined in a spot that is much smaller than the diffraction limit. Such a transducer was integrated into a recording head and. own over a magnetic recording medium on a rotating disk. Optical power from a semiconductor laser at a wavelength of 830 nm was efficiently coupled by the transducer into the medium to heat a 70-nm track above the Curie point in nanoseconds and record data at an areal density of similar to 375 Tb m(-2). This transducer design should scale to even smaller optical spots.

引用

页码：220 / 224

页数：5

共 23 条

[1]

[Anonymous], 1995, Computational Electrodynamics: The Finite-Difference TimeDomain Method

[2] THE INTERACTION BETWEEN ELECTROMAGNETIC RESONANCES AND ITS ROLE IN SPECTROSCOPIC STUDIES OF MOLECULES ADSORBED ON COLLOIDAL PARTICLES OR METAL SPHERES [J].