Zakład Fizyki Magnetyków, Wydział Fizyki, Uniwersytet w Białymstoku

Reversible effects: Light-induced magnetic anisotropy in Co-doped garnet films

	Light induced wall deformation parameter b as a function of angle between light polarization plane and crystallographic direction [100] in sample plane. Parameter b was measured with external magnetic field (curve 1) and without external magnetic field (curve 2). Phys.Rev.B 57, 21 14366 (1998).

	Scheme and domain structure images before a) and after b) film illumination by linearly polarized light. Phys.Rev.B 64, 064405 (2001).

	Animation: polarized light writing (click to enlarge)

Non-reversible effects: Laser annealing

Scheme of experimental set

Types of used lasers: Ti:Saphire (Chameleon - Coherent); argon laser;

Parameters of the Chameleon laser: Type Ti:Saphire; Pulse 140fs; Wavelength 690-1040nm; Frequency 90MHz; Power 1.9W; Beam Diameter 1.1mm;

Size of focused beam – about 15 μm;

Computer-controlled x-y position (step motors) and irradiation time (shutter);

Adjustable parameters: time of exposure, power of light, Co thickness (sample);

Ultrathin Co wedge after laser treatment: various types of annealed objects

Magnetic anisotropy of Co films annealed by laser pulses – poster presented on E-MRS conference - Warszawa 2007 (click to enlarge)