Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo

Sicong Wang; Chen Wei; Yuanhua Feng; Hongkun Cao; Wenzhe Li; Yaoyu Cao; Bai-Ou Guan; Arata Tsukamoto; Andrei Kirilyuk; Alexey V. Kimel; Xiangping Li

doi:10.1038/s41377-020-00451-z

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Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo

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- Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo
- Light: Science & Applications Vol. 10, Issue 1, Pages: 98-105(2021)
- Affiliations：
  
  1.Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
  2.Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
  3.Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
  4.Institute of New Energy Technology, Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
  5.College of Science and Technology, Nihon University, 7-24-1 Funabashi, Chiba 274-8501, Japan
  6.FELIX Laboratory, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
- Author bio：
  
  Alexey V. Kimel (Aleksei.Kimel@ru.nl)
  Xiangping Li (xiangpingli@jnu.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-00451-z
  CLC：
- Published：2021，
  
  Published Online：06 January 2021，
  
  Received：24 June 2020，
  
  Revised：05 December 2020，
  
  Accepted：07 December 2020
- Accepted：
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Wang, S. C. et al. Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo. Light: Science & Applications, 10, 98-105 (2021).
DOI：

Wang, S. C. et al. Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo. Light: Science & Applications, 10, 98-105 (2021). DOI： 10.1038/s41377-020-00451-z.

摘要

Abstract

Although photonics presents the fastest and most energy-efficient method of data transfer

magnetism still offers the cheapest and most natural way to store data. The ultrafast and energy-efficient optical control of magnetism is presently a missing technological link that prevents us from reaching the next evolution in information processing. The discovery of all-optical magnetization reversal in GdFeCo with the help of 100 fs laser pulses has further aroused intense interest in this compelling problem. Although the applicability of this approach to high-speed data processing depends vitally on the maximum repetition rate of the switching

the latter remains virtually unknown. Here we experimentally unveil the ultimate frequency of repetitive all-optical magnetization reversal through time-resolved studies of the dual-shot magnetization dynamics in Gd

63.87

9.13

. Varying the intensities of the shots and the shot-to-shot separation

we reveal the conditions for ultrafast writing and the fastest possible restoration of magnetic bits. It is shown that although magnetic writing launched by the first shot is completed after 100 ps

a reliable rewriting of the bit by the second shot requires separating the shots by at least 300 ps. Using two shots partially overlapping in space and minimally separated by 300 ps

we demonstrate an approach for GHz magnetic writing that can be scaled down to sizes below the diffraction limit.

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Keywords

references

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