Effect of laser induced orbital momentum on magnetization switching

A. Kundu, Shufeng Zhang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The observed magnetization switching by circularly polarized ultrafast laser pulses has been attributed to the inverse Faraday effect in which the induced non-equilibrium orbital momentum serves as an effective magnetic field via spin-orbit coupling for magnetization rotation and switching. We critically examine this scenario by explicitly calculating the magnitude of the induced orbital momentum for generic itinerant band. We show that the calculated induced angular momentum is not large enough for reversing the magnetization by one laser pulse with the order of 100 femtosecond duration. Instead, we propose that each laser pulse is capable to expand a reverse domain a few nano-meters and it takes multiple pulses to complete the magnetization reversal process via domain wall motion.

Original languageEnglish (US)
Pages (from-to)165-169
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume454
DOIs
StatePublished - May 15 2018

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Laser pulses
Magnetization
Momentum
momentum
orbitals
magnetization
Lasers
pulses
lasers
Magnetization reversal
Ultrafast lasers
Faraday effect
Angular momentum
Domain walls
reversing
Orbits
Magnetic fields
domain wall
angular momentum
orbits

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effect of laser induced orbital momentum on magnetization switching. / Kundu, A.; Zhang, Shufeng.

In: Journal of Magnetism and Magnetic Materials, Vol. 454, 15.05.2018, p. 165-169.

Research output: Contribution to journalArticle

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abstract = "The observed magnetization switching by circularly polarized ultrafast laser pulses has been attributed to the inverse Faraday effect in which the induced non-equilibrium orbital momentum serves as an effective magnetic field via spin-orbit coupling for magnetization rotation and switching. We critically examine this scenario by explicitly calculating the magnitude of the induced orbital momentum for generic itinerant band. We show that the calculated induced angular momentum is not large enough for reversing the magnetization by one laser pulse with the order of 100 femtosecond duration. Instead, we propose that each laser pulse is capable to expand a reverse domain a few nano-meters and it takes multiple pulses to complete the magnetization reversal process via domain wall motion.",
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AB - The observed magnetization switching by circularly polarized ultrafast laser pulses has been attributed to the inverse Faraday effect in which the induced non-equilibrium orbital momentum serves as an effective magnetic field via spin-orbit coupling for magnetization rotation and switching. We critically examine this scenario by explicitly calculating the magnitude of the induced orbital momentum for generic itinerant band. We show that the calculated induced angular momentum is not large enough for reversing the magnetization by one laser pulse with the order of 100 femtosecond duration. Instead, we propose that each laser pulse is capable to expand a reverse domain a few nano-meters and it takes multiple pulses to complete the magnetization reversal process via domain wall motion.

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