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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 8 — Apr. 15, 2007
  • pp: 936–938

Femtosecond magneto-optical Kerr microscopy

A. Laraoui, M. Albrecht, and J.-Y. Bigot  »View Author Affiliations

Optics Letters, Vol. 32, Issue 8, pp. 936-938 (2007)

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We have developed a magneto-optical Kerr microscope that allows us to measure the ultrafast magnetization dynamics of ferromagnetic nanostructures. The magneto-optical signal can be recorded in a confocal reflection geometry with an accurate selection of the polarization. The magnetization dynamics is obtained from pump–probe measurements using frequency nondegenerate collinear pump and probe beams with a temporal resolution of 180 fs . Both probe and pump beams are focused to their diffraction limit, leading to an overall spatial resolution of 600 nm . The efficiency of the apparatus is tested by investigating the magnetization dynamics of individual Co Pt 3 disks with a submicrometer diameter and a thickness of 15 nm .

© 2007 Optical Society of America

OCIS Codes
(180.0180) Microscopy : Microscopy
(210.3810) Optical data storage : Magneto-optic systems
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7120) Ultrafast optics : Ultrafast phenomena

ToC Category:
Ultrafast Optics

Original Manuscript: November 15, 2006
Revised Manuscript: January 30, 2007
Manuscript Accepted: January 31, 2007
Published: March 19, 2007

A. Laraoui, M. Albrecht, and J.-Y. Bigot, "Femtosecond magneto-optical Kerr microscopy," Opt. Lett. 32, 936-938 (2007)

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