Revealing the Nature of the Ultrafast Magnetic Phase Transition in Ni by Correlating Extreme Ultraviolet Magneto-Optic and Photoemission Spectroscopies
- Univ. of Colorado, Boulder, CO (United States). JILA; National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
- National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
- Uppsala Univ. (Sweden)
By correlating time- and angle-resolved photoemission and time-resolved transverse- magnetooptical 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. In this work, 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 ≈ 200 fs, and subsequent recovery of the 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.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States). JILA
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Swedish Research Council (VR); Wallenberg Foundation: European Union; KMLabs
- Grant/Contract Number:
- SC0002002; GBMF4538; 2015.0060; 737709
- OSTI ID:
- 1673434
- Alternate ID(s):
- OSTI ID: 1464870; OSTI ID: 1957808
- Journal Information:
- Physical Review Letters, Vol. 121, Issue 7; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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