Grazing-incidence optical magnetic recording with super-resolution.
Grazing-incidence optical magnetic recording with super-resolution.
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DOI：
10.3762/bjnano.8.4
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发表时间：
2017
影响因子：
3.1
通讯作者：
Oron D
中科院分区：
文献类型：
--
作者：
Scheunert G;Cohen SR;Kullock R;McCarron R;Rechev K;Kaplan-Ashiri I;Bitton O;Dawson P;Hecht B;Oron D
热辅助磁记录(HAMR)通常被认为是存储行业的下一个主要步骤：预计它将增加未来硬盘驱动器的存储容量、读写速度和数据寿命。然而，尽管进行了十多年的开发工作，可靠性仍然是一个首要问题。作为近场换能器(NFT)的一部分，作为高度局部化的热源，当前的行业概念仍然无法提供具有足够寿命的驱动器，其特点是固有的脆弱表面等离子体谐振器。这项研究提出了一种通过额外的掠入射激光照明来辅助常规NFT设计的方法，这可能为高耐久性HAMR开辟了一条替代途径。使用绿色和近红外半导体激光器，在消费级CoCrPT垂直磁记录介质上演示了磁开关。在没有NFT的情况下，在仅μ0H=0.3T的中等偏场中，使用40 mW功率和50 ns持续时间的单个激光脉冲，在样品表面的激光光斑尺寸为3μm(短轴)的情况下写入亚500 nm的磁性特征--比磁性特征大6倍。在这里，纳米物体的存在，即原子力显微镜的尖端在样品表面的激光焦点上，对记录的磁性特征没有影响-因此表明与NFT-HAMR完全兼容。
Heat-assisted magnetic recording (HAMR) is often considered the next major step in the storage industry: it is predicted to increase the storage capacity, the read/write speed and the data lifetime of future hard disk drives. However, despite more than a decade of development work, the reliability is still a prime concern. Featuring an inherently fragile surface-plasmon resonator as a highly localized heat source, as part of a near-field transducer (NFT), the current industry concepts still fail to deliver drives with sufficient lifetime. This study presents a method to aid conventional NFT-designs by additional grazing-incidence laser illumination, which may open an alternative route to high-durability HAMR. Magnetic switching is demonstrated on consumer-grade CoCrPt perpendicular magnetic recording media using a green and a near-infrared diode laser. Sub-500 nm magnetic features are written in the absence of a NFT in a moderate bias field of only μ0H = 0.3 T with individual laser pulses of 40 mW power and 50 ns duration with a laser spot size of 3 μm (short axis) at the sample surface – six times larger than the magnetic features. Herein, the presence of a nanoscopic object, i.e., the tip of an atomic force microscope in the focus of the laser at the sample surface, has no impact on the recorded magnetic features – thus suggesting full compatibility with NFT-HAMR.