Optical control of magnetization dynamics in Gd-Fe-Co films with different compositions

Takuo Ohkochi, Hidenori Fujiwara, Masato Kotsugi, Hirokazu Takahashi, Roman Adam, Akira Sekiyama, Tetsuya Nakamura, Arata Tsukamoto, Claus M. Schneider, Hiroto Kuroda, Elvis F. Arguelles, Mamoru Sakaue, Hideaki Kasai, Masakiyo Tsunoda, Shigemasa Suga, Toyohiko Kinoshita

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Perpendicularly magnetized ferrimagnetic Gd-Fe-Co thin films with different compositions and multilayer arrangements were subjected to femtosecond laser pulses. The pulses triggered different magnetization dynamics in the various thin films. In the Gd26Fe66Co8 film, which has an angular-momentum-compensation temperature (TA) well above ambient temperature (Texp), monotonic magnetization reversal occurred, whereas the Gd22Fe70Co8 film (where TA is well below Texp) exhibited remarkable wavelike spin modulation with spatial inhomogeneity during relaxation of the laser-induced nonequilibrium state. These findings can enable broad-range tuning of the magneto-optical responses of Gd-Fe-Co alloys, facilitating advances in materials engineering.

Original languageEnglish
Article number103002
JournalApplied Physics Express
Volume10
Issue number10
DOIs
Publication statusPublished - 2017 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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