Ultrafast laser-induced magneto-optical response of CoFeB/MgO/CoFeB magnetic tunneling junction

Author:

Ji Bingyu1,Jin Zuanming1ORCID,Wu Guanjie2,Li Jugeng3,Wan Caihua4,Han Xiufeng4ORCID,Zhang Zongzhi2,Ma Guohong3,Peng Yan1ORCID,Zhu Yiming1

Affiliation:

1. Terahertz Technology Innovation Research Institute, Terahertz Spectrum and Imaging Technology Cooperative Innovation Center, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology 1 , Shanghai 200093, China

2. Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and Key Laboratory of Micro and Nano Photonic Structures (MOE), School of Information Science and Technology, Fudan University 2 , Shanghai 200433, China

3. Department of Physics, Shanghai University 3 , 99 Shangda Road, Shanghai 200444, China

4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences 4 , Beijing 100190, China

Abstract

Understanding of ultrafast spin dynamics is crucial for future ultrafast and energy efficient magnetic memory and storage applications. We study the ultrafast laser-induced magneto-optical response of a CoFeB/MgO/CoFeB magnetic tunneling junction (MTJ), when exciting with a short laser pulse, as a function of magnetic configuration and pump fluence. The ultrafast magnetization of the MTJ drops rapidly in the timescale of 0.33–0.37 ps, which is driven by both electron-spin scattering and spin transport mutually. Subsequently, the energy from the electron and spin reservoirs transfers into the lattice with the timescale of 1.5–2.0 and 5.0–15.0 ps through the electron–phonon and spin–phonon interactions, respectively. Our results suggest that the interfacial spin-orientation of CoFeB/MgO/CoFeB could modulate the interaction constant between spins and phonons. These findings provide insight into the role of MTJ interface in spin dynamics, which will be helpful for opto-spintronic tunnel junction stack designs and applications.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Overseas Expertise Introduction Project for Discipline Innovation

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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