Laser-induced magnetization dynamics for L10-FePt thin films with perpendicular anisotropy

Boyin Cui, Jiaqi Zhao, Zongzhi Zhang, B. Ma, Q. Y. Jin

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Laser-induced de- and re-magnetization dynamics in perpendicularly magnetized L10-FePt films are studied by using a time-resolved magneto-optical pump-probe technique. The observed ultrafast magnetic dynamic behaviors depend on the film thickness and substrate temperature. The thinner FePt film has a relatively larger maximum demagnetization percentage and a slower relaxation rate because of fewer free electrons being in the laser spot area. However, for the same thickness samples, although they have the same maximum demagnetization, their magnetization recovery speed is different. The sample deposited at high Ts exhibits a faster recovery due to the relatively large FePt grains with high magneto-crystalline anisotropy energy. In addition, we find that all the FePt samples reach the maximum demagnetization at an almost same characteristic delay time of 0.9 picoseconds, irrespective of the laser intensity, film thickness, and substrate temperature.

Original languageEnglish (US)
Pages (from-to)1269-1273
Number of pages5
JournalJournal of the Korean Physical Society
Volume56
Issue number41
DOIs
StatePublished - Apr 15 2010

Keywords

  • Laser heating
  • Magnetization dynamics
  • Perpendicular anisotropy

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