uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Dissecting spin-phonon equilibration in ferrimagnetic insulators by ultrafast lattice excitation
Max Planck Gesell, Fritz Haber Inst, Faradayweg 4-6, D-14195 Berlin, Germany;Free Univ Berlin, Dept Phys, Arnimallee 14, D-14195 Berlin, Germany;Columbia Univ, Dept Chem, 3000 Broadway, New York, NY 10027 USA.
Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2A, D-12489 Berlin, Germany;Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany;Tech Univ Berlin, Inst Opt & Atom Phys, Hardenbergstr 36, D-10623 Berlin, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-8524-819X
Max Planck Gesell, Fritz Haber Inst, Faradayweg 4-6, D-14195 Berlin, Germany.
Show others and affiliations
2018 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 4, no 7, article id eaar5164Article in journal (Refereed) Published
Abstract [en]

To gain control over magnetic order on ultrafast time scales, a fundamental understanding of the way electron spins interact with the surrounding crystal lattice is required. However, measurement and analysis even of basic collective processes such as spin-phonon equilibration have remained challenging. Here, we directly probe the flow of energy and angular momentum in the model insulating ferrimagnet yttrium iron garnet. After ultrafast resonant lattice excitation, we observe that magnetic order reduces on distinct time scales of 1 ps and 100 ns. Temperature-dependent measurements, a spin-coupling analysis, and simulations show that the two dynamics directly reflect two stages of spin lattice equilibration. On the 1-ps scale, spins and phonons reach quasi-equilibrium in terms of energy through phonon-induced modulation of the exchange interaction. This mechanism leads to identical demagnetization of the ferrimagnet's two spin sublattices and to a previously inaccessible ferrimagnetic state of increased temperature yet unchanged total magnetization. Finally, on the much slower, 100-ns scale, the excess of spin angular momentum is released to the crystal lattice, resulting in full equilibrium. Our findings are relevant for all insulating ferrimagnets and indicate that spin manipulation by phonons, including the spin Seebeck effect, can be extended to antiferromagnets and into the terahertz frequency range.

Place, publisher, year, edition, pages
2018. Vol. 4, no 7, article id eaar5164
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-364063DOI: 10.1126/sciadv.aar5164ISI: 000443176100018PubMedID: 30027115OAI: oai:DiVA.org:uu-364063DiVA, id: diva2:1266413
Funder
EU, Horizon 2020, 681917Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2015.0060Swedish National Infrastructure for Computing (SNIC)Available from: 2018-11-28 Created: 2018-11-28 Last updated: 2018-11-28Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textPubMed

Authority records BETA

Maldonado, PabloOppeneer, Peter M.

Search in DiVA

By author/editor
Maldonado, PabloOppeneer, Peter M.
By organisation
Materials Theory
In the same journal
Science Advances
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 9 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf