Tailoring of the magnetic field induced by the inverse Faraday effect has received much attention due to its potential applications in data storage. However, many issues remain, hindering the application of all-optical magnetic storage technology, e.g. the challenges in the speed and precision of recording and deleting different bits of information in different positions of the magnetic recording film. To achieve on-the-fly magnetic recording and deletion of information with a high degree of accuracy, pure longitudinal magnetization spots with opposite directions are theoretically produced in this paper. Firstly, twin pure longitudinal magnetization spots with opposite directions are induced by tailoring the amplitude and phase of a tightly focused azimuthally polarized beam (APB). These pure longitudinal magnetization spots with opposite directions open up a route toward writing and deleting recording bits with high writing speed as well as a high degree of accuracy. Then, we proved that this strategy can also be used to generate multiple longitudinal magnetization spots with opposite directions, which will facilitate high-density 3D optomagnetic recording. Compared with traditional methods, which require complex optical systems to generate longitudinal magnetization spots with opposite directions, we only need to tailor the amplitude and phase of the APB. More importantly, the directions of the induced magnetization spots can be tuned easily, and the magnetization spots have the same intensity distribution.

由于其在数据存储中的潜在应用，由逆法拉第效应引起的磁场的定制受到了很多关注。然而，全光磁存储技术的应用仍然存在诸多问题，例如在磁记录膜不同位置记录和删除不同位信息的速度和精度的挑战。为了实现高精度的动态磁记录和信息删除，本文从理论上产生了方向相反的纯纵向磁化点。首先，通过调整紧密聚焦的方位极化光束 (APB) 的幅度和相位来诱导具有相反方向的双纯纵向磁化点。这些相反方向的纯纵向磁化点开辟了一条以高写入速度和高精度写入和删除记录位的途径。然后，我们证明了该策略也可用于生成多个方向相反的纵向磁化点，这将有助于高密度 3D 光磁记录。与传统方法需要复杂的光学系统来产生方向相反的纵向磁化点相比，我们只需要调整 APB 的幅度和相位。更重要的是，感应磁化点的方向可以很容易地调整，并且磁化点具有相同的强度分布。