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The nature of the ultrafast magnetic phase transition in nickel revealed by correlating EUV-MOKE and ARPES spectroscopies
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- Tao, Zhensheng (author)
- Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.;Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200438, Peoples R China.
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- You, Wenjing (author)
- Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.
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- Tengdin, Phoebe (author)
- Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.
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- Univ Colorado, Dept Phys, Boulder, CO 80309 USA;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.;Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200438, Peoples R China. Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (creator_code:org_t)
- 2019-04-16
- 2019
- English.
- In: XXI International Conference on Ultrafast Phenomena 2018 (UP 2018). - : EDP Sciences.
- Conference paper (peer-reviewed)
Abstract
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- By correlating time- and angle-resolved photoemission (Tr-ARPES) and time-resolved transverse- magneto-optical Kerr effect (Tr-TMOKE) measurements, both at extreme ultraviolet (EUV) wavelengths, we uncover the 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. We provide an alternative explanation to the fluence-dependent recovery timescales commonly observed in ultrafast magneto-optical spectroscopies on ferromagnets: it is due to the bulk-averaging effect and different depths of sample exhibit distinct dynamics, depending on whether a magnetic phase transition is induced. We also show evidence of two competing channels with two distinct timescales in the recovery process, that suggest the presence of coexisting phases in the material.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
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