Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching

LI, Guanqi, ZHENG, Xiangyu, WANG, Junlin, LU, Xianyang, WU, Jing, CAI, Jianwang, MENG, Hao, LIU, Bo, OSTLER, Thomas and XU, Yongbing (2023). Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching. Rare Metals, 42, 234-243.

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Abstract

The heating and helicity effects induced by circularly polarized laser excitation are entangled in the helicity-dependent all-optical switching (HD-AOS), which hinders understanding the magnetization dynamics involved. Here, applying a dual-pump laser excitation, first with a linearly polarized (LP) laser pulse followed by a circularly polarized (CP) laser pulse, the timescales and contribution from heating and helicity effects in HD-AOS were identified with a Pt/Co/Pt triple-layer. When the LP laser pulses preheat the sample to a nearly fully demagnetized state, the CP laser pulses with a power reduced by 80% switch the sample’s magnetization. By varying the time delay between the two pump pulses, the results show that the helicity effect, which gives rise to the deterministic helicity-induced switching, arises almost instantly within 200 fs close to the pulse width upon laser excitation. The results reveal that the transient magnetization state upon which CP laser pulses impinge is the key factor for achieving HD-AOS, and importantly, the tunability between heating and helicity effects with the unique dual-pump laser excitation approach will enable HD-AOS in a wide range of magnetic material systems having wide-ranging implications for potential ultrafast spintronics applications.

Item Type:	Article
Uncontrolled Keywords:	0914 Resources Engineering and Extractive Metallurgy; Materials
Identification Number:	https://doi.org/10.1007/s12598-022-02117-8
Page Range:	234-243
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	26 Apr 2022 14:40
Last Modified:	20 Dec 2022 11:30
URI:	https://shura.shu.ac.uk/id/eprint/30127

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