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  • Received: May. 20, 2020

    Accepted: Jun. 16, 2020

    Posted: Aug. 6, 2020

    Published Online: Aug. 7, 2020

    The Author Email: Weisheng Zhao (

    DOI: 10.3788/COL202018.102501

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    Xiaoqiang Zhang, Guanghao Rui, Yong Xu, Fan Zhang, Yinchang Du, Mingtao Lian, Xiaoyang Lin, Anting Wang, Hai Ming, Weisheng Zhao. Multi-layer magnetic recording driven by a tunable laser[J]. Chinese Optics Letters, 2020, 18(10): 102501

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Chinese Optics Letters, Vol. 18, Issue 10, 102501 (2020)

Multi-layer magnetic recording driven by a tunable laser

Xiaoqiang Zhang1,2, Guanghao Rui3, Yong Xu1,2, Fan Zhang1,2, Yinchang Du1,2, Mingtao Lian1,2, Xiaoyang Lin1,2, Anting Wang4, Hai Ming4, and Weisheng Zhao1,2,*

Author Affiliations

  • 1Hefei Innovation Research Institute, School of Microelectronics, Beihang University, Hefei 230013, China
  • 2Fert Beijing Institute, BDBC, Beihang University, Beijing 100191, China
  • 3Advanced Photonics Center, Southeast University, Nanjing 210096, China
  • 4Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China


All-optical magnetization switching with features of low-power consumption and high writing speed is a promising road map to satisfy the demand for volume data storage. To promote denser and faster magnetic recording technologies, herein, all-optical helicity-dependent switching (AO-HDS) in multi-layer magnetic recording is proposed based on the chromatic aberration of an optical lens (Thorlabs’s N-BK7 plano-convex uncoated lens). The power of the incident beams and the thickness of the multi-layer magnetic recording film are designed carefully. Besides, the uniformity of this multi-layer magnetic recording is optimized. At last, a prototype system of information multiplexing based on this multi-layer magnetic recording technology is constructed as well. Flexible and controllable magnetization reversals in different layers are also demonstrated by tuning the wavelength and helicity of working beams. We believe that such a prototype system can pave the way for increasing the storage density in an effective and low-cost mode.


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