Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt
Abstract
The evolution of the electronic band structure of the simple ferromagnets Fe, Co, and Ni during their well-known ferromagnetic-paramagnetic phase transition has been under debate for decades, with no clear and even contradicting experimental observations so far. Using time- and spin-resolved photoelectron spectroscopy, we can make a movie on how the electronic properties change in real time after excitation with an ultrashort laser pulse. This allows us to monitor large transient changes in the spin-resolved electronic band structure of cobalt for the first time. We show that the loss of magnetization is not only found around the Fermi level, where the states are affected by the laser excitation, but also reaches much deeper into the electronic bands. We find that the ferromagnetic-paramagnetic phase transition cannot be explained by a loss of the exchange splitting of the spin-polarized bands but instead shows rapid band mirroring after the excitation, which is a clear signature of extremely efficient ultrafast magnon generation. Our result helps to understand band structure formation in these seemingly simple ferromagnetic systems and gives first clear evidence of the transient processes relevant to femtosecond demagnetization.
- Authors:
-
- Univ. of Kaiserslautern and Research Center OPTIMAS, Kaiserslautern (Germany)
- Forschungszentrum Julich (Germany). Peter Grunberg Inst. (PGI 6); Experimentalphysik Univ. Duisburg-Essen, Duisburg (Germany)
- Univ. of Kaiserslautern and Research Center OPTIMAS, Kaiserslautern (Germany); Graduate School MAINZ, Kaiserslautern (Germany)
- Forschungszentrum Julich (Germany). Peter Grunberg Inst. (PGI 6)
- Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology, Boulder, CO (United States). JILA
- Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology, Boulder, CO (United States). JILA
- Georg-August-Univ. Gottingen, Gottingen (Germany). I. Physikalisches Inst.
- Technische Univ. Dortmund, Dortmund (Germany). Experimentelle Physik VI
- Publication Date:
- Research Org.:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1463898
- Alternate Identifier(s):
- OSTI ID: 1678731
- Grant/Contract Number:
- SC0002002
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Science Advances
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2375-2548
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; femtomagnetism; band-structure renormalization; correlated materials; high-harmonic generation; time-resolved photoemission; Stoner vs. Heisenberg picture
Citation Formats
Eich, Steffen, Plötzing, Moritz, Rollinger, Markus, Emmerich, Sebastian, Adam, Roman, Chen, Cong, Kapteyn, Henry Cornelius, Murnane, Margaret M., Plucinski, Lukasz, Steil, Daniel, Stadtmuller, Benjamin, Cinchetti, Mirko, Aeschlimann, Martin, Schneider, Claus M., and Mathias, Stefan. Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt. United States: N. p., 2017.
Web. doi:10.1126/sciadv.1602094.
Eich, Steffen, Plötzing, Moritz, Rollinger, Markus, Emmerich, Sebastian, Adam, Roman, Chen, Cong, Kapteyn, Henry Cornelius, Murnane, Margaret M., Plucinski, Lukasz, Steil, Daniel, Stadtmuller, Benjamin, Cinchetti, Mirko, Aeschlimann, Martin, Schneider, Claus M., & Mathias, Stefan. Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt. United States. https://doi.org/10.1126/sciadv.1602094
Eich, Steffen, Plötzing, Moritz, Rollinger, Markus, Emmerich, Sebastian, Adam, Roman, Chen, Cong, Kapteyn, Henry Cornelius, Murnane, Margaret M., Plucinski, Lukasz, Steil, Daniel, Stadtmuller, Benjamin, Cinchetti, Mirko, Aeschlimann, Martin, Schneider, Claus M., and Mathias, Stefan. 2017.
"Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt". United States. https://doi.org/10.1126/sciadv.1602094. https://www.osti.gov/servlets/purl/1463898.
@article{osti_1463898,
title = {Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt},
author = {Eich, Steffen and Plötzing, Moritz and Rollinger, Markus and Emmerich, Sebastian and Adam, Roman and Chen, Cong and Kapteyn, Henry Cornelius and Murnane, Margaret M. and Plucinski, Lukasz and Steil, Daniel and Stadtmuller, Benjamin and Cinchetti, Mirko and Aeschlimann, Martin and Schneider, Claus M. and Mathias, Stefan},
abstractNote = {The evolution of the electronic band structure of the simple ferromagnets Fe, Co, and Ni during their well-known ferromagnetic-paramagnetic phase transition has been under debate for decades, with no clear and even contradicting experimental observations so far. Using time- and spin-resolved photoelectron spectroscopy, we can make a movie on how the electronic properties change in real time after excitation with an ultrashort laser pulse. This allows us to monitor large transient changes in the spin-resolved electronic band structure of cobalt for the first time. We show that the loss of magnetization is not only found around the Fermi level, where the states are affected by the laser excitation, but also reaches much deeper into the electronic bands. We find that the ferromagnetic-paramagnetic phase transition cannot be explained by a loss of the exchange splitting of the spin-polarized bands but instead shows rapid band mirroring after the excitation, which is a clear signature of extremely efficient ultrafast magnon generation. Our result helps to understand band structure formation in these seemingly simple ferromagnetic systems and gives first clear evidence of the transient processes relevant to femtosecond demagnetization.},
doi = {10.1126/sciadv.1602094},
url = {https://www.osti.gov/biblio/1463898},
journal = {Science Advances},
issn = {2375-2548},
number = 3,
volume = 3,
place = {United States},
year = {Fri Mar 24 00:00:00 EDT 2017},
month = {Fri Mar 24 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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