SwePub
Sök i LIBRIS databas

  Utökad sökning

id:"swepub:oai:DiVA.org:uu-411210"
 

Sökning: id:"swepub:oai:DiVA.org:uu-411210" > The nature of non-e...

  • Tao, ZhenshengFudan 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. (författare)

The nature of non-equilibrium ultrafast demagnetization in ferromagnetic nickel

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • SPIE,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-411210
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-411210URI
  • https://doi.org/10.1117/12.2548814DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:kon swepub-publicationtype

Anmärkningar

  • 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.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Tengdin, PhoebeUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • You, WenjingUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Chen, CongUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Shi, XunUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Zusin, DmitriyUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Zhang, YingchaoUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Gentry, ChristianUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Blonsky, AdamUniv Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Keller, MarkNIST, Boulder, CO 80309 USA. (författare)
  • Oppeneer, Peter M.Uppsala universitet,Materialteori(Swepub:uu)peopp623 (författare)
  • Kapteyn, Henry C.Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • Murnane, Margaret M.Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. (författare)
  • 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)

Sammanhörande titlar

  • Ingår i:Eleventh International Conference On Information Optics And Photonics (CIOP 2019): SPIE9781510631748

Internetlänk

Hitta via bibliotek

Till lärosätets databas

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy