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Fully controllable three-dimensional light-induced longitudinal magnetization using a single objective lens.

Xiaoqiang Zhang, Guanghao Rui, Yong Xu

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    This study introduces a new method for faster data storage using light-induced magnetization spots. The technique allows for on-the-fly control of recording positions, enhancing magnetic storage capabilities.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Data Storage Technologies

    Background:

    • All-optical helicity-dependent switching (AO-HDS) offers fast, energy-efficient data writing for next-generation storage.
    • Current AO-HDS methods require physical movement of components, limiting writing speed.
    • Achieving on-the-fly magnetization switching necessitates fully controllable induced magnetization.

    Purpose of the Study:

    • To propose a strategy for creating subwavelength, light-induced pure longitudinal multi-magnetization spots.
    • To enable dynamic control over the positions of these multi-magnetization spots for on-the-fly recording.
    • To advance three-dimensional magnetic recording techniques with dynamic position control.

    Main Methods:

    • Focusing an azimuthally polarized vortex beam (APVB).
    • Introducing an additional phase to the APVB.
    • Surveying the distributions of focused APVBs with varying orbital angular momentum and their induced magnetizations.

    Main Results:

    • Demonstrated a feasible strategy for constructing subwavelength light-induced pure longitudinal multi-magnetization spots.
    • Showcased dynamic control over the positions of these multi-magnetization spots.
    • Analyzed the relationship between APVB properties and induced magnetization patterns.

    Conclusions:

    • The proposed method offers a practical and flexible approach to three-dimensional magnetic recording.
    • Dynamic control of recording positions is achieved, overcoming limitations of current AO-HDS techniques.
    • This technique holds promise for enhancing the speed and efficiency of volume data storage.