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

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.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. Creative Research Institution Sousei, Hokkaido University, Kita-21, Nishi-10, Kita-ku, Sapporo, Hokkaido 001-0021 (Japan)
  2. (Japan)
  3. Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, Kita-8, Nishi-13, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)
  4. Research Institute for Electronic Science, Hokkaido University, Kita-20, Nishi-10, Kita-ku, Sapporo, Hokkaido 001-0020 (Japan)
  5. Graduate School of Engineering, Tohoku University, Sendai, 6-6-02 Aramaki Aza Aoba, Miyagi 980-8579 (Japan)
Publication Date:
OSTI Identifier:
22413012
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ALLOYS; COERCIVE FORCE; CRYSTAL STRUCTURE; FREQUENCY DEPENDENCE; IRON ALLOYS; KERR EFFECT; LASER RADIATION; MAGNETIC FIELDS; MAGNETIZATION; PHASE TRANSFORMATIONS; PULSED IRRADIATION; SURFACES