期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.077204
关键词
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资金
- Department of Energy Office of Basic Energy Sciences X-Ray Scattering Program Award [DE-SC0002002]
- National Science Foundation through the JILA Physics Frontiers Center [PHY-1125844]
- Gordon and Betty Moore Foundation EPiQS Award [GBMF4538]
- Swedish Research Council (VR)
- Wallenberg Foundation [2015.0060]
- EU H2020 Grant [737709]
- U.S. Department of Energy (DOE) [DE-SC0002002] Funding Source: U.S. Department of Energy (DOE)
By correlating time-and angle-resolved photoemission and time-resolved transverse magneto-optical Kerr effect measurements, both at extreme ultraviolet wavelengths, we uncover the universal nature of the ultrafast photoinduced magnetic phase transition in Ni. This allows us to explain the ultrafast magnetic response of Ni at all laser fluences-from a small reduction of the magnetization at low laser fluences, to complete quenching at high laser fluences. Both probe methods exhibit the same demagnetization and recovery timescales. The spin system absorbs the energy required to proceed through a magnetic phase transition within 20 fs after the peak of the pump pulse. However, the spectroscopic signatures of demagnetization of the material appear only after approximate to 200 fs and the subsequent recovery of magnetization on timescales ranging from 500 fs to >70 ps. We also provide evidence of two competing channels with two distinct timescales in the recovery process that suggest the presence of coexisting phases in the material.
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