Ultrafast control of coherent spin precession in ferromagnetic thin films via thermal spin excitation processes induced by two-pulse laser excitation

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Abstract

We investigate the laser-induced spin precession dynamics in ferromagnetic Ni0.8Fe0.2 thin films by using a time-resolved magneto-optical Kerr effect (TR-MOKE) measurement with two pump pulses. By changing the time interval between the pump pulses, the amplitude of the TR-MOKE signal is strongly modulated according to the phase of the TR-MOKE signal at the time when the second pulse arrives. The change in the oscillation amplitude can be explained with the temporal evolution of the spin precession induced by laser heating, as shown with a numerical simulation. We conclude that the ultrafast control of coherent spin precession dynamics is possible by multiple pump pulses via thermal excitation.

Original languageEnglish
Article number014438
JournalPhysical Review B
Volume97
Issue number1
DOIs
Publication statusPublished - 2018 Jan 31

Fingerprint

Optical Kerr effect
Laser excitation
precession
Spin dynamics
Laser pulses
Pumps
Thin films
Kerr effects
thin films
pulses
excitation
lasers
Laser heating
pumps
laser heating
Lasers
Computer simulation
Hot Temperature
intervals
oscillations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Ultrafast control of coherent spin precession in ferromagnetic thin films via thermal spin excitation processes induced by two-pulse laser excitation",
abstract = "We investigate the laser-induced spin precession dynamics in ferromagnetic Ni0.8Fe0.2 thin films by using a time-resolved magneto-optical Kerr effect (TR-MOKE) measurement with two pump pulses. By changing the time interval between the pump pulses, the amplitude of the TR-MOKE signal is strongly modulated according to the phase of the TR-MOKE signal at the time when the second pulse arrives. The change in the oscillation amplitude can be explained with the temporal evolution of the spin precession induced by laser heating, as shown with a numerical simulation. We conclude that the ultrafast control of coherent spin precession dynamics is possible by multiple pump pulses via thermal excitation.",
author = "Hiroaki Shibata and Makoto Okano and Shinichi Watanabe",
year = "2018",
month = "1",
day = "31",
doi = "10.1103/PhysRevB.97.014438",
language = "English",
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T1 - Ultrafast control of coherent spin precession in ferromagnetic thin films via thermal spin excitation processes induced by two-pulse laser excitation

AU - Shibata, Hiroaki

AU - Okano, Makoto

AU - Watanabe, Shinichi

PY - 2018/1/31

Y1 - 2018/1/31

N2 - We investigate the laser-induced spin precession dynamics in ferromagnetic Ni0.8Fe0.2 thin films by using a time-resolved magneto-optical Kerr effect (TR-MOKE) measurement with two pump pulses. By changing the time interval between the pump pulses, the amplitude of the TR-MOKE signal is strongly modulated according to the phase of the TR-MOKE signal at the time when the second pulse arrives. The change in the oscillation amplitude can be explained with the temporal evolution of the spin precession induced by laser heating, as shown with a numerical simulation. We conclude that the ultrafast control of coherent spin precession dynamics is possible by multiple pump pulses via thermal excitation.

AB - We investigate the laser-induced spin precession dynamics in ferromagnetic Ni0.8Fe0.2 thin films by using a time-resolved magneto-optical Kerr effect (TR-MOKE) measurement with two pump pulses. By changing the time interval between the pump pulses, the amplitude of the TR-MOKE signal is strongly modulated according to the phase of the TR-MOKE signal at the time when the second pulse arrives. The change in the oscillation amplitude can be explained with the temporal evolution of the spin precession induced by laser heating, as shown with a numerical simulation. We conclude that the ultrafast control of coherent spin precession dynamics is possible by multiple pump pulses via thermal excitation.

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