skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on June 7, 2020

Title: All-optical spin switching under different spin configurations

Abstract

All-optical spin switching represents a new frontier in femtomagnetism. However, its underlying principles are quite different from traditional thermal activated spin switching. In this work, we employ a atomic spin model and present a systematic investigation from a single spin to a large system of over a million spins. We find that for a single spin in absence of external laser excitation, the conservation of total angular momentum requires that the spin change exactly matches the orbital momentum change, but a laser pulse significantly alters this relation, where the spin change does not necessarily follow the orbital change. This is reflected in the strong dependence of switching on laser polarization. To have an efficient spin switching, the electron initial momentum direction must closely follow the spin’s orientation, so the orbital angular momentum is transverse to the spin and consequently the spin-orbit torque lies in the same direction as the spin. These findings are manifested in a much larger system. We find that the spin response depends on underlying spin structures. Linearly polarized laser pulses creates a dip in a uniform inplane magnetized thin film, but has little effects on Neel and Bloch walls. Both right- and left- circularly polarized lightmore » (σ+ and σ-) have stronger but different effects in both uniform spin domains and Neel walls. While σ+ light creates a basin of spins pointing down, σ- light creates a mound of spins pointing up. At the vicinity of the structure spins are reversed, similar to the experimental observation. σ+ light has a dramatic effect, disrupting spins in Bloch walls. By contrast, σ+ light has a small effect on Bloch walls because of its helicity. These findings are expected to have important implications in the future.« less

Authors:
ORCiD logo [1];  [1]
  1. Indiana State Univ., Terre Haute, IN (United States)
Publication Date:
Research Org.:
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
OSTI Identifier:
1593952
Grant/Contract Number:  
FG02-06ER46304; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 31; Journal Issue: 34; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, G. P., and Murakami, Mitsuko. All-optical spin switching under different spin configurations. United States: N. p., 2019. Web. doi:10.1088/1361-648X/ab24a2.
Zhang, G. P., & Murakami, Mitsuko. All-optical spin switching under different spin configurations. United States. doi:10.1088/1361-648X/ab24a2.
Zhang, G. P., and Murakami, Mitsuko. Fri . "All-optical spin switching under different spin configurations". United States. doi:10.1088/1361-648X/ab24a2.
@article{osti_1593952,
title = {All-optical spin switching under different spin configurations},
author = {Zhang, G. P. and Murakami, Mitsuko},
abstractNote = {All-optical spin switching represents a new frontier in femtomagnetism. However, its underlying principles are quite different from traditional thermal activated spin switching. In this work, we employ a atomic spin model and present a systematic investigation from a single spin to a large system of over a million spins. We find that for a single spin in absence of external laser excitation, the conservation of total angular momentum requires that the spin change exactly matches the orbital momentum change, but a laser pulse significantly alters this relation, where the spin change does not necessarily follow the orbital change. This is reflected in the strong dependence of switching on laser polarization. To have an efficient spin switching, the electron initial momentum direction must closely follow the spin’s orientation, so the orbital angular momentum is transverse to the spin and consequently the spin-orbit torque lies in the same direction as the spin. These findings are manifested in a much larger system. We find that the spin response depends on underlying spin structures. Linearly polarized laser pulses creates a dip in a uniform inplane magnetized thin film, but has little effects on Neel and Bloch walls. Both right- and left- circularly polarized light (σ+ and σ-) have stronger but different effects in both uniform spin domains and Neel walls. While σ+ light creates a basin of spins pointing down, σ- light creates a mound of spins pointing up. At the vicinity of the structure spins are reversed, similar to the experimental observation. σ+ light has a dramatic effect, disrupting spins in Bloch walls. By contrast, σ+ light has a small effect on Bloch walls because of its helicity. These findings are expected to have important implications in the future.},
doi = {10.1088/1361-648X/ab24a2},
journal = {Journal of Physics. Condensed Matter},
number = 34,
volume = 31,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 7, 2020
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

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


Thermally Assisted All-Optical Helicity Dependent Magnetic Switching in Amorphous Fe 100- x Tb x Alloy Films
journal, April 2013

  • Hassdenteufel, Alexander; Hebler, Birgit; Schubert, Christian
  • Advanced Materials, Vol. 25, Issue 22
  • DOI: 10.1002/adma.201300176

All-thermal switching of amorphous Gd-Fe alloys: Analysis of structural properties and magnetization dynamics
journal, September 2015


Magneto‐optic recording materials with direct overwrite capability
journal, August 1986

  • Shieh, Han‐Ping D.; Kryder, Mark H.
  • Applied Physics Letters, Vol. 49, Issue 8
  • DOI: 10.1063/1.97120

Reversible optical switching of antiferromagnetism in TbMnO3
journal, August 2016

  • Manz, Sebastian; Matsubara, Masakazu; Lottermoser, Thomas
  • Nature Photonics, Vol. 10, Issue 10
  • DOI: 10.1038/nphoton.2016.146

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


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


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


Generating high-order optical and spin harmonics from ferromagnetic monolayers
journal, August 2018


Engineered materials for all-optical helicity-dependent magnetic switching
journal, February 2014

  • Mangin, S.; Gottwald, M.; Lambert, C-H.
  • Nature Materials, Vol. 13, Issue 3
  • DOI: 10.1038/nmat3864

Light-induced magnetization reversal of high-anisotropy TbCo alloy films
journal, October 2012

  • Alebrand, Sabine; Gottwald, Matthias; Hehn, Michel
  • Applied Physics Letters, Vol. 101, Issue 16
  • DOI: 10.1063/1.4759109

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


Single shot all optical switching of intrinsic micron size magnetic domains of a Pt/Co/Pt ferromagnetic stack
journal, December 2017

  • Vomir, M.; Albrecht, M.; Bigot, J. -Y.
  • Applied Physics Letters, Vol. 111, Issue 24
  • DOI: 10.1063/1.5010915

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


All-Optical Magnetic Recording with Circularly Polarized Light
journal, July 2007


All-optical helicity dependent magnetic switching in an artificial zero moment magnet
journal, February 2014

  • Schubert, C.; Hassdenteufel, A.; Matthes, P.
  • Applied Physics Letters, Vol. 104, Issue 8
  • DOI: 10.1063/1.4866803

Quantum mechanical interpretation of the ultrafast all optical spin switching
journal, March 2017

  • Murakami, Mitsuko; Babyak, Zach; Giocolo, Michael
  • Journal of Physics: Condensed Matter, Vol. 29, Issue 18
  • DOI: 10.1088/1361-648X/aa6558

Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet
journal, January 2012

  • Ostler, T. A.; Barker, J.; Evans, R. F. L.
  • Nature Communications, Vol. 3, Issue 1
  • DOI: 10.1038/ncomms1666

Optically induced magnetization reversal in [ Co / Pt ] N multilayers: Role of domain wall dynamics
journal, December 2018


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


Total angular momentum conservation in laser-induced femtosecond magnetism
journal, August 2008


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


Electrical characterization of all-optical helicity-dependent switching in ferromagnetic Hall crosses
journal, February 2016

  • El Hadri, M. S.; Pirro, P.; Lambert, C. -H.
  • Applied Physics Letters, Vol. 108, Issue 9
  • DOI: 10.1063/1.4943107

Magneto‐optic recording technology (invited)
journal, April 1985

  • Kryder, Mark H.
  • Journal of Applied Physics, Vol. 57, Issue 8
  • DOI: 10.1063/1.334915