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Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching
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作者 Guan-Qi Li Xiang-Yu Zheng +7 位作者 Jun-Lin Wang Xian-Yang Lu Jing Wu Jian-Wang Cai Hao Meng Bo Liu thomas a.ostler Yong-Bing Xu 《Rare Metals》 SCIE EI CAS CSCD 2023年第1期234-243,共10页
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.H... 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 dualpump laser excitation approach will enable HD-AOS in a wide range of magnetic material systems having wideranging implications for potential ultrafast spintronics applications. 展开更多
关键词 Helicity-dependent all-optical switching Ultrafast laser Ultrafast magnetization Magneto-optical interaction
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