Wavelength-dependent magnetic transitions of self-organized iron–aluminum stripes induced by pulsed laser irradiation
- Creative Research Institution Sousei, Hokkaido University, Kita-21, Nishi-10, Kita-ku, Sapporo, Hokkaido 001-0021 (Japan)
- Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, Kita-8, Nishi-13, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)
- Research Institute for Electronic Science, Hokkaido University, Kita-20, Nishi-10, Kita-ku, Sapporo, Hokkaido 001-0020 (Japan)
- Graduate School of Engineering, Tohoku University, Sendai, 6-6-02 Aramaki Aza Aoba, Miyagi 980-8579 (Japan)
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.
- OSTI ID:
- 22413012
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nanopatterns induced by pulsed laser irradiation on the surface of an Fe-Al alloy and their magnetic properties
Characterization of amorphous TbFeCo films for magneto-optical media