Wavelength-dependent magnetic transitions of self-organized iron-aluminum stripes induced by pulsed laser irradiation

Yutaka Yoshida, Seiichi Watanabe, Hideo Kaiju, Junji Nishii, Kyosuke Yoshimi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate the laser wavelength dependence of structural and magnetic transitions on the surface of an iron-aluminum (FeAl) alloy induced by nanosecond pulsed laser irradiation. The formation of self-organized FeAl stripes with a wavelength-dependent period is observed in a local area on the (111)-oriented plane. Focused magneto-optical Kerr effect measurements reveal that the coercivity reaches up to 1.2 kOe with increasing the magnetic field rotation angle, which is estimated from the stripe direction, in FeAl stripes irradiated at 355 nm, and its magnetization reversal can be explained by the domain-wall motion model. On the other hand, the magnetization reversal agrees with the Stoner-Wohlfarth model in FeAl stripes irradiated at 1064 nm. This magnetic transition originates from the B2-to-A2 phase transition in stripe structures and bulk regions. These results indicate that the magnetic transition from the incoherent to coherent mode as well as the structural transformation of stripe patterns can be controlled by the incident laser wavelength.

Original languageEnglish
Article number045305
JournalJournal of Applied Physics
Volume117
Issue number4
DOIs
Publication statusPublished - 2015 Jan 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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