Three-dimensional supercritical resolved light-induced magnetic holography

Chenglong Hao, Zhongquan Nie, Huapeng Ye, Hao Li, Yang Luo, Rui Feng, Xia Yu, Feng Wen, Ying Zhang, Changyuan Yu, Jinghua Teng, Boris Luk’yanchuk, Cheng-Wei Qiu.

Three-dimensional supercritical resolved light-induced magnetic holography

ABSTRACT

In the era of big data, there exists a growing gap between data generated and storage capacity using two-dimensional (2D) magnetic storage technologies (for example, hard disk drives), because they have reached their performance saturation. 3D volumetric all-optical magnetic holography is emerging rapidly as a promising road map to realizing high-density capacity for its fast magnetization control and subwavelength magnetization volume. However, most of the reported light-induced magnetization confronts the problems of impurely longitudinal magnetization, diffraction-limited spot, and uncontrollable magnetization reversal. To overcome these challenges, we propose a novel 3D light-induced magnetic holography based on the conceptual supercritical design with multibeam combination in the 4 pi microscopic system. We theoretically demonstrate a 3D deep super-resolved (similar to(lambda 3)/59) purely longitudinal magnetization spot by focusing six coherent circularly polarized beams with two opposing high numerical aperture objectives, which allows 3D magnetic holography with a volumetric storage density of up to 1872 terabit per cubic inches. The number and locations of the super-resolved magnetization spots are controllable, and thus, desired magnetization arrays in 3D volume can be produced with properly designed phase filters. Moreover, flexible magnetization reversals are also demonstrated in multifocal arrays by using different illuminations with opposite light helicity. In addition to data storage, this magnetic holography may find applications in information security, such as identity verification for a credit card with magnetic stripe.


Language English
Journal Science advances
Year
2013
Article number e1701398
Volume 3
Issue number
10
Status published


KEYWORDS

longitudinal magnetization; multifocal array; polarized-light; vortex beams; thin films; diffraction; field;  media; generation; anisotropy


DOI: 10.1126/sciadv.1701398

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Chenglong Hao, Zhongquan Nie, Huapeng Ye, Hao Li, Yang Luo, Rui Feng, Xia Yu, Feng Wen, Ying Zhang, Changyuan Yu, Jinghua Teng, Boris Luk’yanchuk, Cheng-Wei Qiu. Three-dimensional supercritical resolved light-induced magnetic holography. Science advances, 2013, 3(10), e1701398.

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