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The nature of non-e...
The nature of non-equilibrium ultrafast demagnetization in ferromagnetic nickel
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- Tao, Zhensheng (author)
- 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.
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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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- 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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- Chen, Cong (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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- Shi, Xun (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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- Zusin, Dmitriy (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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- Zhang, Yingchao (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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- Gentry, Christian (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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- Blonsky, Adam (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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- Keller, Mark (author)
- NIST, Boulder, CO 80309 USA.
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- Oppeneer, Peter M. (author)
- Uppsala universitet,Materialteori
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- Kapteyn, Henry C. (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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- Murnane, Margaret M. (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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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. Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (creator_code:org_t)
- SPIE, 2019
- 2019
- English.
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In: Eleventh International Conference On Information Optics And Photonics (CIOP 2019). - : SPIE. - 9781510631748
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- It has long been known that ferromagnets undergo a phase transition from ferromagnetic to paramagnetic at the Curie temperature, associated with critical phenomena such as a divergence in the heat capacity. A ferromagnet can also be transiently demagnetized by heating it with an ultrafast laser pulse. However, to date the connection between out-of-equilibrium and equilibrium phase transitions was not known, nor how fast the out-of-equilibrium phase transitions can proceed. In this work, by combining time- and angle-resolved photoemission (Tr-ARPES) with time-resolved transverse magneto-optical Kerr (Tr-TMOKE) spectroscopies, we show that the same critical behavior also governs the ultrafast magnetic phase transition in nickel. This is evidenced by several observations. First, we observe a divergence of the transient heat capacity of the electron spin system preceding material demagnetization. Second, when the electron temperature is transiently driven above the Curie temperature, we observe an extremely rapid change in the material response: the spin system absorbs sufficient energy within the first 20 fs to subsequently proceed through the phase transition, while demagnetization and the collapse of the exchange splitting occur on much longer timescales. Third, we find that the transient electron temperature alone dictates the magnetic response. By comparing results obtained from different methods, we show that the critical behaviors are essential for fully explaining the fluence-dependent magnetization dynamics measured using magneto-optical spectroscopy.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Ultrafast demagnetization
- High-harmonic generation
- Time-resolved ARPES
- Time-resolved TMOKE
Publication and Content Type
- ref (subject category)
- kon (subject category)
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- By the author/editor
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Tao, Zhensheng
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Tengdin, Phoebe
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You, Wenjing
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Chen, Cong
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Shi, Xun
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Zusin, Dmitriy
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show more...
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Zhang, Yingchao
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Gentry, Christia ...
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Blonsky, Adam
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Keller, Mark
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Oppeneer, Peter ...
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Kapteyn, Henry C ...
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Murnane, Margare ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
- Articles in the publication
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Eleventh Interna ...
- By the university
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Uppsala University