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Title: Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism

Abstract

Laser-induced femtosecond demagnetization, femtomagnetism, provides a potential route to develop faster magnetic storage devices. It is generally thought that the traditional spin-wave theory, which is developed for thermally driven slow demagnetization, cannot explain this rapid demagnetization by design. Here, we show that this traditional spin-wave theory, once augmented by laser-induced spin–orbit torque, provides a highly efficient paradigm for demagnetization, by capturing low-energy spin-wave excitation that is absent in existing mechanisms. Our paradigm is different from existing ones but does not exclude them. Microscopically, we find that optical spin–orbit torque generates massive spin waves across several hundred lattice sites, collapsing the long-range spin-spin correlation within 20 fs. Our result does not only explain new experiments but also establishes an alternative paradigm for femtomagnetism. It is expected to have far-reaching impacts on future research.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [3]
  1. Indiana State Univ., Terre Haute, IN (United States)
  2. Univ. of Missouri—St. Louis, St. Louis, MO (United States)
  3. Nanjing Univ. (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Indiana State Univ., Terre Haute, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1577605
Alternate Identifier(s):
OSTI ID: 1593955
Grant/Contract Number:  
AC02-05CH11231; FG02-06ER46304
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 10; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Zhang, Guo Ping, Murakami, M., Bai, Y. H., George, Thomas F., and Wu, X. S. Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism. United States: N. p., 2019. Web. doi:10.1063/1.5110522.
Zhang, Guo Ping, Murakami, M., Bai, Y. H., George, Thomas F., & Wu, X. S. Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism. United States. doi:10.1063/1.5110522.
Zhang, Guo Ping, Murakami, M., Bai, Y. H., George, Thomas F., and Wu, X. S. Thu . "Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism". United States. doi:10.1063/1.5110522.
@article{osti_1577605,
title = {Spin-orbit torque-mediated spin-wave excitation as an alternative paradigm for femtomagnetism},
author = {Zhang, Guo Ping and Murakami, M. and Bai, Y. H. and George, Thomas F. and Wu, X. S.},
abstractNote = {Laser-induced femtosecond demagnetization, femtomagnetism, provides a potential route to develop faster magnetic storage devices. It is generally thought that the traditional spin-wave theory, which is developed for thermally driven slow demagnetization, cannot explain this rapid demagnetization by design. Here, we show that this traditional spin-wave theory, once augmented by laser-induced spin–orbit torque, provides a highly efficient paradigm for demagnetization, by capturing low-energy spin-wave excitation that is absent in existing mechanisms. Our paradigm is different from existing ones but does not exclude them. Microscopically, we find that optical spin–orbit torque generates massive spin waves across several hundred lattice sites, collapsing the long-range spin-spin correlation within 20 fs. Our result does not only explain new experiments but also establishes an alternative paradigm for femtomagnetism. It is expected to have far-reaching impacts on future research.},
doi = {10.1063/1.5110522},
journal = {Journal of Applied Physics},
number = 10,
volume = 126,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
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Works referenced in this record:

Laser-Induced Ultrafast Demagnetization in Ferromagnetic Metals
journal, October 2000


Investigating the role of superdiffusive currents in laser induced demagnetization of ferromagnets with nanoscale magnetic domains
journal, April 2014

  • Moisan, N.; Malinowski, G.; Mauchain, J.
  • Scientific Reports, Vol. 4, Issue 1
  • DOI: 10.1038/srep04658

Critical behavior within 20 fs drives the out-of-equilibrium laser-induced magnetic phase transition in nickel
journal, March 2018


Understanding all-optical spin switching: Comparison between experiment and theory
journal, October 2018


Magnetization dynamics and damping due to electron-phonon scattering in a ferrimagnetic exchange model
journal, July 2014

  • Baral, Alexander; Vollmar, Svenja; Schneider, Hans Christian
  • Physical Review B, Vol. 90, Issue 1
  • DOI: 10.1103/PhysRevB.90.014427

Many-Body Theory of Ultrafast Demagnetization and Angular Momentum Transfer in Ferromagnetic Transition Metals
journal, November 2015


Ultrafast optical demagnetization manipulates nanoscale spin structure in domain walls
journal, January 2012

  • Pfau, B.; Schaffert, S.; Müller, L.
  • Nature Communications, Vol. 3, Issue 1
  • DOI: 10.1038/ncomms2108

Distinguishing the ultrafast dynamics of spin and orbital moments in solids
journal, May 2010

  • Boeglin, C.; Beaurepaire, E.; Halté, V.
  • Nature, Vol. 465, Issue 7297
  • DOI: 10.1038/nature09070

Switching ferromagnetic spins by an ultrafast laser pulse: Emergence of giant optical spin-orbit torque
journal, September 2016


Ultrafast optical manipulation of magnetic order
journal, September 2010


Imaging Ultrafast Demagnetization Dynamics after a Spatially Localized Optical Excitation
journal, May 2014


Probing the timescale of the exchange interaction in a ferromagnetic alloy
journal, March 2012

  • Mathias, S.; La-O-Vorakiat, C.; Grychtol, P.
  • Proceedings of the National Academy of Sciences, Vol. 109, Issue 13
  • DOI: 10.1073/pnas.1201371109

Femtosecond modification of electron localization and transfer of angular momentum in nickel
journal, August 2007

  • Stamm, C.; Kachel, T.; Pontius, N.
  • Nature Materials, Vol. 6, Issue 10
  • DOI: 10.1038/nmat1985

Role of initial magnetic disorder: A time-dependent ab initio study of ultrafast demagnetization mechanisms
journal, June 2019


All-optical spin switching: A new frontier in femtomagnetism — A short review and a simple theory
journal, August 2016


Perspective: Ultrafast magnetism and THz spintronics
journal, October 2016

  • Walowski, Jakob; Münzenberg, Markus
  • Journal of Applied Physics, Vol. 120, Issue 14
  • DOI: 10.1063/1.4958846

Ultrafast demagnetization of ferromagnetic transition metals: The role of the Coulomb interaction
journal, November 2009


The ultrafast Einstein–de Haas effect
journal, January 2019


Dynamics of electron-magnon interaction and ultrafast demagnetization in thin iron films
journal, November 2008


All-optical spin switching under different spin configurations
journal, June 2019


Ultrafast magnetization dynamics of nanostructures: Ultrafast magnetization dynamics of nanostructures
journal, January 2013


First-principles and model simulation of all-optical spin reversal
journal, October 2017


Laser-Induced Demagnetization at Ultrashort Time Scales: Predictions of TDDFT
journal, September 2015

  • Krieger, K.; Dewhurst, J. K.; Elliott, P.
  • Journal of Chemical Theory and Computation, Vol. 11, Issue 10
  • DOI: 10.1021/acs.jctc.5b00621

Superdiffusive Spin Transport as a Mechanism of Ultrafast Demagnetization
journal, July 2010


Ultrafast demagnetization in bulk versus thin films: an ab initio study
journal, April 2017

  • Krieger, K.; Elliott, P.; Müller, T.
  • Journal of Physics: Condensed Matter, Vol. 29, Issue 22
  • DOI: 10.1088/1361-648X/aa66f2

A new and simple model for magneto-optics uncovers an unexpected spin switching
journal, October 2015


Spin Flips versus Spin Transport in Nonthermal Electrons Excited by Ultrashort Optical Pulses in Transition Metals
journal, September 2017


Hot-Electron-Driven Enhancement of Spin-Lattice Coupling in Gd and Tb 4 f Ferromagnets Observed by Femtosecond X-Ray Magnetic Circular Dichroism
journal, March 2011


Time-resolved x-ray magnetic circular dichroism study of ultrafast demagnetization in a CoPd ferromagnetic film excited by circularly polarized laser pulse
journal, July 2012


Ultrafast Spin Dynamics in Ferromagnetic Nickel
journal, May 1996


All-Optical Probe of Coherent Spin Waves
journal, May 2002


Resolving photon-shortage mystery in femtosecond magnetism
journal, February 2010


Laser-induced ultrafast transport and demagnetization at the earliest time: first-principles and real-time investigation
journal, October 2018

  • Zhang, G. P.; Bai, Y. H.; Jenkins, Tyler
  • Journal of Physics: Condensed Matter, Vol. 30, Issue 46
  • DOI: 10.1088/1361-648X/aae5a9

Laser-induced ultrafast demagnetization in the presence of a nanoscale magnetic domain network
journal, January 2012

  • Vodungbo, Boris; Gautier, Julien; Lambert, Guillaume
  • Nature Communications, Vol. 3, Issue 1
  • DOI: 10.1038/ncomms2007

Nanoscale interface confinement of ultrafast spin transfer torque driving non-uniform spin dynamics
journal, April 2017

  • Razdolski, Ilya; Alekhin, Alexandr; Ilin, Nikita
  • Nature Communications, Vol. 8, Issue 1
  • DOI: 10.1038/ncomms15007

Explaining the paradoxical diversity of ultrafast laser-induced demagnetization
journal, December 2009

  • Koopmans, B.; Malinowski, G.; Dalla Longa, F.
  • Nature Materials, Vol. 9, Issue 3
  • DOI: 10.1038/nmat2593

Microscopic theory of ultrafast spin linear reversal
journal, May 2011


Indirect excitation of ultrafast demagnetization
journal, January 2016

  • Vodungbo, Boris; Tudu, Bharati; Perron, Jonathan
  • Scientific Reports, Vol. 6, Issue 1
  • DOI: 10.1038/srep18970

Ultrafast spin transport as key to femtosecond demagnetization
journal, January 2013

  • Eschenlohr, A.; Battiato, M.; Maldonado, P.
  • Nature Materials, Vol. 12, Issue 4
  • DOI: 10.1038/nmat3546

Ultrafast Magnon Generation in an Fe Film on Cu(100)
journal, November 2010


Coherent Optical Phonons and Parametrically Coupled Magnons Induced by Femtosecond Laser Excitation of the Gd(0001) Surface
journal, November 2003


Stoner versus Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization
journal, December 2016


Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys
journal, April 2019


Erratum: Ultrafast optical manipulation of magnetic order [Rev. Mod. Phys. 82 , 2731 (2010)]
journal, August 2016


Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase transition in cobalt
journal, March 2017

  • Eich, Steffen; Plötzing, Moritz; Rollinger, Markus
  • Science Advances, Vol. 3, Issue 3
  • DOI: 10.1126/sciadv.1602094

Role of electron-magnon scatterings in ultrafast demagnetization
journal, July 2014


Understanding laser-induced ultrafast magnetization in ferromagnets: First-principles investigation
journal, April 2008

  • Zhang, G. P.; Bai, Yihua; Hübner, W.
  • Journal of Applied Physics, Vol. 103, Issue 7
  • DOI: 10.1063/1.2837248

Controlling the Competition between Optically Induced Ultrafast Spin-Flip Scattering and Spin Transport in Magnetic Multilayers
journal, May 2013


Investigating the contribution of superdiffusive transport to ultrafast demagnetization of ferromagnetic thin films
journal, June 2013

  • Schellekens, A. J.; Verhoeven, W.; Vader, T. N.
  • Applied Physics Letters, Vol. 102, Issue 25
  • DOI: 10.1063/1.4812658